1 退回輸入鍵盤 2 蘋果 ios 開發一年的工作筆記 3 - (BOOL) textFieldShouldReturn:(id)textField{ [textField resignFirstResponder]; 4 } 5 CGRect 6 CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height);矩形 NSStringFromCGRect(someCG) 把 CGRect 結構轉變為格式化字符串; CGRectFromString(aString) 由字符串恢復出矩形; 7 CGRectInset(aRect) 創建較小或較大的矩形(中心點相同),+較小 -較大 CGRectIntersectsRect(rect1, rect2) 判斷兩矩形是否交叉,是否重疊 CGRectZero 高度和寬度為零的/位于(0,0)的矩形常量 8 CGPoint & CGSize 9 CGPoint aPoint = CGPointMake(x, y); CGSize aSize = CGSizeMake(width, height); 10 設置透明度 11 [myView setAlpha:value]; (0.0 < value < 1.0) 12 設置背景色 13 [myView setBackgroundColor:[UIColor redColor]]; 14 (blackColor;darkGrayColor;lightGrayColor; whiteColor;grayColor; redColor; greenColor; blueColor; cyanColor;yellowColor; magentaColor;orangeColor;purpleColor; brownColor; clearColor; ) 15 自定義顏色 16 UIColor *newColor = [[UIColor alloc] 17 initWithRed:(float) green:(float) blue:(float) alpha:(float)]; 18 0.0~1.0 19 豎屏 20 320X480 21 橫屏 22 480X320 23 狀態欄高 (顯示時間和網絡狀態) 20 像素 24 導航欄、工具欄高(返回) 44 像素 25 隱藏狀態欄 26 [[UIApplication shareApplication] setStatusBarHidden: YES animated:NO] 27 橫屏 28 [[UIApplication shareApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight]. 29 屏幕變動檢測 30 orientation == UIInterfaceOrientationLandscapeLeft 31 全屏 32 window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds]; 33 自動適應父視圖大小: 34 aView.autoresizingSubviews = YES; 35 aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | 36 UIViewAutoresizingFlexibleHeight); 37 定義按鈕 38 UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [scaleUpButton setTitle:@"放 大" forState:UIControlStateNormal]; scaleUpButton.frame = CGRectMake(40, 420, 100, 40); 39 [scaleUpButton addTarget:self 40 action:@selector(scaleUp) forControlEvents:UIControlEventTouchUpInside]; 41 設置視圖背景圖片 42 UIImageView *aView; 43 [aView setImage:[UIImage imageNamed:@”name.png”]]; view1.backgroundColor = [UIColor colorWithPatternImage: [UIImage imageNamed:@"image1.png"]]; 44 自定義 UISlider 的樣式和滑塊 45 46 我們使用的是 UISlider 的 setMinimumTrackImage,和 setMaximumTrackImage 方法來定義圖 片的,這兩個方法可以設置滑塊左邊和右邊的圖片的,不過如果用的是同一張圖片且寬度和 控件寬度基本一致,就不會有變形拉伸的后果,先看代碼,寫在 viewDidLoad 中: 47 //左右軌的圖片 48 UIImage *stetchLeftTrack= [UIImage imageNamed:@"brightness_bar.png"]; UIImage *stetchRightTrack = [UIImage imageNamed:@"brightness_bar.png"]; //滑塊圖片 49 UIImage *thumbImage = [UIImage imageNamed:@"mark.png"]; 50 UISlider *sliderA=[[UISlider alloc]initWithFrame:CGRectMake(30, 320, 257, 7)]; sliderA.backgroundColor = [UIColor clearColor]; 51 sliderA.value=1.0; 52 sliderA.minimumValue=0.7; 53 sliderA.maximumValue=1.0; 54 [sliderA setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal]; 55 [sliderA setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal]; //注意這里要加UIControlStateHightlighted的狀態,否則當拖動滑塊時滑塊將變成原生的 56 控件 57 [sliderA setThumbImage:thumbImage forState:UIControlStateHighlighted]; [sliderA setThumbImage:thumbImage forState:UIControlStateNormal]; //滑塊拖動時的事件 58 [sliderA addTarget:self action:@selector(sliderValueChanged:) 59 forControlEvents:UIControlEventValueChanged]; //滑動拖動后的事件 60 [sliderA addTarget:self action:@selector(sliderDragUp:) 61 forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:sliderA]; 62 為了大家實驗方便,我附上背景圖brightness_bar.png和滑塊圖mark.png http://pic002.cnblogs.com/images/2011/162291/2011121611431816.png http://pic002.cnblogs.com/images/2011/162291/2011121611432897.png 63 -(IBAction)sliderValueChanged:(id)sender{ 64 UISlider *slider = (UISlider *) sender; 65 NSString *newText = [[NSString alloc] initWithFormat:@”%d”, (int)(slider.value + 0.5f)]; label.text = newText; 66 } 67 活動表單 68  69 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 70 <UIActionSheetDelegate> 71 - (IBActive) someButtonPressed:(id) sender { 72 UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@”Are you sure?” 73 delegate:self 74 cancelButtonTitle:@”No way!” destructiveButtonTitle:@”Yes, I’m Sure!” otherButtonTitles:nil]; 75 [actionSheet showInView:self.view]; 76 [actionSheet release]; } 77 警告視圖 78 <UIAlertViewDelegate> 79 - (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex 80 { 81 if(buttonIndex != [actionSheet cancelButtonIndex]) { 82 NSString *message = [[NSString alloc] initWithFormat:@”You can breathe easy, everything went OK.”]; 83 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Something was done” 84 [alert show]; [alert release]; [message release]; 85 } } 86 動畫效果 87 -(void)doChange:(id)sender { 88 if(view2 == nil) 89 { 90 [self loadSec]; 91 message:message delegate:self cancelButtonTitle:@”OK” otherButtonTitles:nil]; 93 } 94 [UIView beginAnimations:nil context:NULL]; 95 [UIView setAnimationDuration:1]; 96 [UIView setAnimationTransition:([view1 superview]?UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRigh t)forView:self.view cache:YES]; 97 if([view1 superview]!= nil) { 98 [view1 removeFromSuperview]; [self.view addSubview:view2]; 99 }else { 100 [view2 removeFromSuperview]; [self.view addSubview:view1]; } 101 [UIView commitAnimations]; 102 } 103 Table View <UITableViewDateSource> #pragma mark - 104 #pragma mark Table View Data Source Methods //指定分區中的行數,默認為 1 105 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 106 { 107 return [self.listData count]; } 108 //設置每一行 cell 顯示的內容 109 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 110 { 111 static NSString *SimpleTableIndentifier = @"SimpleTableIndentifier"; 112 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIndentifier]; if (cell == nil) { 113 cell = [[[UITableViewCell alloc] 114 initWithStyle:UITableViewCellStyleSubtitle 115 reuseIdentifier:SimpleTableIndentifier] 116 autorelease]; 117 } 118 UIImage *image = [UIImage imageNamed:@"13.gif"]; cell.imageView.image = image; 119 NSUInteger row = [indexPath row]; cell.textLabel.text = [listData objectAtIndex:row]; 120 cell.textLabel.font = [UIFont boldSystemFontOfSize:20]; 121 if(row < 5) 122 cell.detailTextLabel.text = @"Best friends"; else 123 cell.detailTextLabel.text = @"friends"; return cell; 124 } 125 圖像、文本標簽和詳細文本標簽 126 圖像:如果設置圖像,則它顯示在文本的左側; 文本標簽:這是單元的主要文本 (UITableViewCellStyleDefault 只顯示文本標簽);詳細文本標簽:這是單元的輔助文本, 通常用作解釋性說明或標簽 127 UITableViewCellStyleSubtitle UITableViewCellStyleDefault UITableViewCellStyleValue1 UITableViewCellStyleValue2 128 <UITableViewDelegate> 129 #pragma mark - 130 #pragma mark Table View Delegate Methods //把每一行縮進級別設置為其行號 131 - (NSInteger)tableView:(UITableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath { 132 NSUInteger row = [indexPath row]; 133 return row; 134 } 135 //獲取傳遞過來的 indexPath 值 136 - (NSIndexPath willSelectRowAtIndexPath:(NSIndexPath *)indexPath 137 { 138 NSUInteger row = [indexPath row]; 139 if (row == 0) 140 return nil; 141 *)tableView 142 *)tableView 143 *)tableView:(UITableView 144 return indexPath; } 145 - (void)tableView:(UITableView 146 *)indexPath 147 { 148 NSUInteger row = [indexPath row]; 149 NSString *rowValue = [listData objectAtIndex:row]; 150 NSString *message = [[NSString alloc] initWithFormat:@"You selected %@",rowValue]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Row Selected" message:message 151 delegate:nil cancelButtonTitle:@"Yes, I did!" otherButtonTitles:nil]; 152 [alert show]; 153 [alert release]; 154 [message release]; 155 [tableView deselectRowAtIndexPath:indexPath animated:YES]; } 156 //設置行的高度 157 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 158 { 159 return 40; 160 } 161 NavigationController 推出 push 推出 pop 162 [self.navigationController pushViewController:_detailController animated:YES]; [self.navigationController popViewControllerAnimated:YES]; 163 Debug: 164 NSLog(@"%s %d", __FUNCTION__, __LINE__); 165 點擊 textField 外的地方回收鍵盤 166 先定義一個 UIControl 類型的對象,在上面可以添加觸發事件,令 SEL 實踐為回收鍵盤的方 法,最后將 UIControl 的實例加到當前 View 上。 167 UIControl *m_control = [[UIControl alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; [m_control addTarget:self action:@selector(keyboardReturn) forControlEvents:UIControlEventTouchUpInside]; 168 [self.view addSubview:m_control]; 169 *)tableView 170 didSelectRowAtIndexPath:(NSIndexPath 171 - (void) keyboardReturn 172 { 173 [aTextField resignFirstResponder]; } 174 鍵盤覆蓋輸入框 175 當鍵盤調出時將輸入框覆蓋時,可以用下方法: 176 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { 177 [self.view setFrame:CGRectMake(0, -100, 320, 480) ]; 178 return YES; 179 } 180 - (BOOL)textFieldShouldEndEditing:(UITextField *)textField { 181 [self.view setFrame:CGRectMake(0, 0, 320, 480)]; return YES; 182 } 183 當準備輸入時,將視圖的位置上調 100,這樣鍵盤就不能覆蓋到輸入框。 184 當依賴注入方法不好使時,可以在 AppDelegate 內申明一個全局的控制器實例 _anotherViewController,在另一個需要使用_anotherViewController 的地方定義以下委托方 法,使用共享的 UIApplication 實例來獲取該委托的引用 185 SomeAppDelegate *appDelegate = (SomeAppDelegate *)[[UIApplication sharedApplication] delegate]; 186 _anotherViewController = appDelegate._anotherViewController; 187 UIViewController 內建 Table View 188 純代碼在 UIViewController 控制器內建 Table View 189 @interface RootViewController : UIViewController UITableViewDataSource> { 190 NSArray *timeZoneNames; 191 } 192 @property (nonatomic,retain) NSArray *timeZoneNames; 193 @end 194 <UITableViewDelegate, 195 (void) loadView 196 { 197 UITableView *tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] style: UITableViewStylePlain]; 198 tableView.autoresizingMask = (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingWidth); 200 tableView.delegate = self; tableView.dataSource = self; [tableView reloadData]; 201 self.view = tableView; [tableView release]; 202 } 203 將 plist 文件中的數據賦給數組 204 NSString *thePath = [[NSBundle mainBundle] pathForResource:@"States" ofType:@"plist"]; NSArray *array = [NSArray arrayWithContentsOfFile:thePath]; 205 UITouch 手指的觸摸范圍:64X64 206 #pragma mark - 207 #pragma mark Touch Events 208 - (void)touchesBegan:(NSSet *) touches withEvent:(UIEvent *) event { originFrame = bookCover.frame; 209 NSLog(@"%s %d", __FUNCTION__,__LINE__); 210 if ([touches count] == 2) 211 { 212 NSArray *twoTouches = [touches allObjects]; 213 UITouch *firstTouch = [twoTouches objectAtIndex:0]; 214 UITouch *secondTouch = [twoTouches objectAtIndex:1]; 215 CGPoint firstPoint = [firstTouch locationInView:bookCover]; CGPoint secondPoint = [secondTouch locationInView:bookCover]; 216 CGFloat deltaX = secondPoint.x - firstPoint.x; 217 CGFloat deltaY = secondPoint.y - firstPoint.y; initialDistance = sqrt(deltaX * deltaX + deltaY * deltaY ); frameX = bookCover.frame.origin.x; 218 frameY = bookCover.frame.origin.y; 219 frameW = bookCover.frame.size.width; 220 frameH = bookCover.frame.size.height; 221 NSLog(@"%s %d", __FUNCTION__,__LINE__); 222 } 223 } 224 - (void)touchesMoved:(NSSet *) touches withEvent:(UIEvent *) event { 225 if([touches count] == 2) 226 { 227 NSLog(@"%s %d", __FUNCTION__,__LINE__); 228 NSArray *twoTouches = [touches allObjects]; 229 UITouch *firstTouch = [twoTouches objectAtIndex:0]; UITouch *secondTouch = [twoTouches objectAtIndex:1]; 230 CGPoint firstPoint = [firstTouch locationInView:bookCover]; CGPoint secondPoint = [secondTouch locationInView:bookCover]; 231 CGFloat deltaX = secondPoint.x - firstPoint.x; 232 CGFloat deltaY = secondPoint.y - firstPoint.y; 233 CGFloat currentDistance = sqrt(deltaX * deltaX + deltaY * deltaY ); 234 if (initialDistance == 0) { 235 initialDistance = currentDistance; 236 } 237 else if (currentDistance != initialDistance) 238 { 239 CGFloat changedDistance = currentDistance - initialDistance; NSLog(@"changedDistance = %f",changedDistance); 240 [bookCover setFrame:CGRectMake(frameX - changedDistance / 2, frameY - (changedDistance * frameH) / (2 * frameW), 241 frameW + changedDistance, 242 frameH + (changedDistance * frameH) / frameW)]; 243 } 244 } 245 } 246 - (void)touchesEnded:(NSSet *) touches withEvent:(UIEvent *) event { UITouch *touch = [touches anyObject]; 247 UITouch 雙擊圖片變大/還原 248 if ([touch tapCount] == 2) 249 { 250 NSLog(@"%s %d", __FUNCTION__,__LINE__); 251 if (!flag) { 252 [bookCover setFrame:CGRectMake(bookCover.frame.origin.x - bookCover.frame.size.width / 2, 253 bookCover.frame.origin.y - bookCover.frame.size.height / 2, 2 * bookCover.frame.size.width, 254 2 * bookCover.frame.size.height)]; 255 flag = YES; 256 } 257 else { 258 [bookCover setFrame:CGRectMake(bookCover.frame.origin.x + bookCover.frame.size.width / 4, bookCover.frame.origin.y + bookCover.frame.size.height / 4, 259 bookCover.frame.size.width / 2, bookCover.frame.size.height / 2)]; 260 flag = NO; 261 } 262 } 263 } 264 Get the Location of Touches 265 (CGPoint)locationInView:(UIView *)view (CGPoint)previousLocationInView:(UIView *)view view window 266 Getting Touch Attributes 267 tapCount(read only) timestamp(read only) phase(read only) 268 Getting a Touch Object's Gesture Recognizers gestureRecognizers 269 Touch Phase 270 UITouchPhaseBegan UITouchPhaseMoved UITouchPhaseStationary UITouchPhaseEnded UITouchPhaseCancelled 271 從 Plist 里讀內容 272 NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"book" ofType:@"plist"]; NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath]; NSString *book = [dictionary objectForKey:bookTitle]; 273 [textView setText:book]; 274 (void) initialize { 275 NSUserDefaults = [NSUserDefaults standardUserDefaults]; 276 NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:@"YES" forKey:@"DeleteBackup"]; 277 [defaults registerDefaults:appDefaults]; } 278 To get a value of a default, use the valueForKey: method: [[theDefaultsController values] valueForKey:@"userName"]; 279 To set a value for a default, use setValue:forKey: 280 [[theDefaultsController values] setValue:newUserName forKey:@"userName"]; 281 [[NSUserDefaults standardUserDefaults] setValue:aVale forKey:aKey]; [[NSUserDefaults standardUserDefaults] valueForKey:aKey]; 282 獲取 Documents 目錄 283 NSArray *paths = NSSearchPathForDictionariesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 284 NSString *documentsDirectory = [paths objectAtIndex:0]; 285 NSString *filename = [documentsDirectory stringByAppendingPathComponent:@"theFile.txt"]; 286 獲取 tmp 目錄 287 NSString *tempPath = NSTemporaryDirectory(); 288 NSString *tempFile = [tempPath stringByAppendingPathComponent:@"tempFile.txt"]; 289 [[NSUserDefaults standardUserDefaults] setObject:data forKey:@"someKey"]; [[NSUserDefaults standardUserDefaults] objectForKey:aKey]; 290 自定義 NavigationBar 291 navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)]; [navigationBar setBarStyle:UIBarStyleBlackOpaque]; 292 myNavigationItem = [[UINavigationItem alloc] initWithTitle:@"Setting"]; [navigationBar setItems:[NSArray arrayWithObject:myNavigationItem]]; [self.view addSubview:navigationBar]; 293 backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(back)]; 294 myNavigationItem.leftBarButtonItem = backButton; 295 利用 Safari 打開一個鏈接 296 NSURL *url = [NSURL URLWithString:@"http://www.cnblogs.com/tracy-e/"]; [[UIApplication sharedApplication] openURL:url]; 297 利用 UIWebView 顯示 pdf 文件、網頁。。。 298 webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; 299 [webView setDelegate:self]; 300 [webView setScalesPageToFit:YES]; 301 [webView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight]; 302 [webView setAllowsInlineMediaPlayback:YES]; 303 [self.view addSubview:webView]; 304 NSString *pdfPath = [[NSBundle mainBundle] pathForResource:@"ojc" ofType:@"pdf"]; NSURL *url = [NSURL fileURLWithPath:pdfPath]; 305 NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy 306 timeoutInterval:5]; 307 [webView loadRequest:request]; 308 [myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString: @"http://www.cnblogs.com/tracy-e/"]]]; 309 NSString *errorString = [NSString stringWithFormat:@"<html><center><font size= +5 color ='red'>An Error Occurred:<br>%@</fone></center></html>",error]; [myWebView loadHTMLString:errorString baseURL:nil]; 310 //Stopping a load request when the view is to disappear - (void)viewWillDisappear:(BOOL)animate{ 311 if ([myWebView loading]){ 312 [myWebView stopLoading]; 313 } 314 myWebView.delegate = nil; 315 [UIApplication shareApplication].networkActivityIndicatorVisible = NO; } 316 漢字轉碼 317 NSString *oriString = @"\u67aa\u738b"; 318 NSString *escapedString = [oriString stringByReplacingPercentEscapesUsingEncoding: NSUTF8StringEncoding]; 319 Checking for background support on earlier versions of iOS 320 UIDevice *device = [UIDevice currentDevice]; 321 BOOL backgroundSupported = NO; 322 if ([device respondsToSelector:@selector(isMultitaskingSupported)]){ 323 backgroundSupported = device.multitaskingSupported; } 324 Being a Responsible,Multitasking-Aware Application 325 # Do not make any OpenGL ES calls from your code. 326 # Cancel any Bonjour-related services before being suspended. 327 # Be prepared to handle connection failures in your network-based sockets. 328 # Save your application state before moving to the background. 329 # Release any unneeded memory when moving to the background. 330 # Stop using shared system resources before being suspended. 331 # Avoid updating your windows and views. 332 # Respond to connect and disconnect notification for external accessories. 333 # Clean up resource for active alerts when moving to the background. 334 # Remove sensitive information from views before moving to the background. # Do minimal work while running in the background. 335 Handing the Keyboard notifications 336 //Call this method somewhere in your view controller setup code - (void) registerForKeyboardNotifications{ 337 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification 338 object:nil]; 339 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification 340 object:nil]; 341 } 342 //Called when the UIKeyboardDidShowNotification is sent 343 - (void)keyboardWasShown:(NSNotification *) aNotification{ if(keyboardShown) 344 return; 345 NSDictionary *info = [aNotification userInfo]; 346 //get the size of the keyboard. 347 NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey]; CGSize keyboardSize = [aValue CGRectValue].size; 348 //Resize the scroll view 349 CGRect viewFrame = [scrollView frame]; viewFrame.size.height -= keyboardSize.height; 350 //Scroll the active text field into view 351 CGRect textFieldRect = [activeField frame]; 352 [scrollView scrollRectToVisible:textFieldRect animated:YES]; 353 keyboardShown = YES; } 354 //Called when the UIKeyboardDidHideNotification is sent 355 - (void)keyboardWasHidden:(NSNotification *) aNotification{ NSDictionary *info = [aNotification userInfo]; 356 //Get the size of the keyboard. 357 NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey]; CGSize keyboardSize = [aValue CGRectValue].size; 358 //Reset the height of the scroll view to its original value CGRect viewFrame = [scrollView Frame]; viewFrame.size.height += keyboardSize.height; scrollView.frame = viewFrame; 359 keyboardShown = NO; } 360 點擊鍵盤的 next 按鈕,在不同的 textField 之間換行 //首先給不同的 textField 賦不同的且相鄰的 tag 值 361 - (BOOL)textFieldShouldReturn:(UITextField *)textField 362 { 363 if ([textField returnKeyType] != UIReturnKeyDone) 364 { 365 NSInteger nextTag = [textField tag] + 1; 366 UIView *nextTextField = [[self tableView] viewWithTag:nextTag]; [nextTextField becomeFirstResponder]; 367 } 368 else { 369 [textField resignFirstResponder]; 370 } 371 return YES; 372 } 373 Configuring a date formatter 374 - (void)viewDidLoad { 375 [super viewDidLoad]; 376 dateFormatter = [[NSDateFormatter alloc] init]; 377 [dateFormatter setGeneratesCalendarDates:YES]; 378 [dateFormatter setLocale:[NSLocale currentLocale]]; 379 [dateFormatter setCalendar:[NSCalendar autoupdatingCurrentCalendar]]; 380 [dateFormatter setTimeZone:[NSTimeZone defaultTimeZone]]; 381 [dateFormatter setDateStyle:NSDateFormatterShortStyle]; 382 DOB.placeholder = [NSString stringWithFormat:@"Example: %@",[dateFormatter stringFromDate:[NSDate date]]]; 383 } 384 - (void)textFieldDidEndEditing:(UITextField *)textField{ [textField resignFirstResponder]; 385 if ([textField.text isEqualToString:@""]) 386 return; 387 switch (textField.tag){ 388 case DOBField: 389 NSDate *theDate = [dateFormatter dateFromString:textField.text]; if (theDate) 390 [inputDate setObject:theDate forKey:MyAppPersonDOBKey]; break; 391 default: 392 break; 393 } 394 } 395 tableView 的 cell 高度 396 tableView 的 cell 高度除了在 delegate 中指定外,還可以在任意位置以[tableView 397 setRowHeight:44]的方式指定 398 [[self navigationItem] setLeftBarButtonItem:[self editButtonItem]]; 399 - (void)setEditing:(BOOL)editing animated:(BOOL)animated{ [super setEditing:editing animated:animated]; 400 if (editing){ 401 ...... 402 } else{ ...... 403 } } 404 One added a subview to a view, release the subview to avoid the extra retain count of it, Because when you insert a view as a subview using addSubview:, the subview is retained by its superview. When you remove the subview from its superview using the removeFromSuperview: method, subview is autoreleased. 405 為 UINavigationBar 設置背景圖片 406 在 iPhone 開發中, 有時候我們想給導航條添加背景圖片, 實現多樣化的導航條效果, 用 407 其他方法往往無法達到理想的效果, 經過網上搜索及多次實驗, 確定如下最佳實現方案: 408 為 UINavigatonBar 增加如下 Category(類別:提供一種為某個類添加方法而又不必編寫子 409 類的途徑,類別只能添加成員函數,不能添加數據成員): 410 @implementation UINavigationBar (CustomImage) - (void)drawRect:(CGRect)rect { 411 UIImage *image = [UIImage imageNamed: @"NavigationBar.png"]; 412 [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; } 413 @end 414 例如, 在我的項目中, 添加如下代碼: / 415 /* input: The image and a tag to later identify the view */ @implementation UINavigationBar (CustomImage) 416 - (void)drawRect:(CGRect)rect { 417 UIImage *image = [UIImage imageNamed: @"title_bg.png"]; 418 [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; } 419 @end 420 / 421 @implementation FriendsPageViewController 422 // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { 423 self.navigationBar.tintColor = [UIColor purpleColor]; 424 [self initWithRootViewController:[[RegPageViewController alloc] init]]; 425 [super viewDidLoad]; } 426 ...... 427 實現的效果如下圖: 428 為 UINavigationBar 添加自定義背景 429 @implementation UINavigationBar (UINavigationBarCategory) 430 - (void)drawRect:(CGRect)rect { //顏色填充 431 // UIColor *color = [UIColor redColor]; 432 // CGContextRef context = UIGraphicsGetCurrentContext(); 433 // CGContextSetFillColor(context, CGColorGetComponents( [color CGColor])); 434 // CGContextFillRect(context, rect); 435 // self.tintColor = color; 436 //圖片填充 437 UIColor *color = [UIColor colorWithRed:46.0f/255.0f green:87.0f/255.0f blue:29.0f/255.0f alpha:1.0f]; 438 UIImage *img = [UIImage imageNamed: @"bg.png"]; 439 [img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; 440 self.tintColor = color; } 441 @end 442 加載圖片要及時 release 443 你還在使用 myImage = [UIImage imageNamed:@"icon.png"]; 嗎? 如題,是不是大家為了方便都這樣加載圖片啊 444 myImage = [UIImage imageNamed:@"icon.png"]; 445 那么小心了 這種方法在一些圖片很少,或者圖片很小的程序里是 ok 的。 但是,在大量加載圖片的程序里,請千萬不要這樣做。 為什么呢 ??????? 446 這種方法在 application bundle 的頂層文件夾尋找由供應的名字的圖象。 如果找到圖片,裝 載到 iPhone 系統緩存圖象。那意味圖片是(理論上)放在內存里作為 cache 的。 447 試想你圖片多了,是什么后果? 448 圖片 cache 極有可能不會響應 memory warnings and release its objects 449 所以,用圖片的時候一定要小心的 alloc 和 release。 450 推 薦 使 用 NSString *path = [[NSBundle mainBundle] pathForResource:@"icon" ofType:@"png"]; 451 myImage = [UIImage imageWithContentsOfFile:path]; 452 // Todo use of myImage 453 [myImage release]; 454 From: http://www.cocoachina.com/bbs/simple/?t27420.html 455 uiwebview 打開 doc,pdf 文件 456 UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 55, 320, 300)]; 457 webView.delegate = self; webView.multipleTouchEnabled = YES; webView.scalesPageToFit = YES; 458 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 459  460 NSUserDomainMask, YES); 461 NSString *documentsDirectory = [paths objectAtIndex:0]; 462 NSString *docPath = [documentsDirectory stringByAppendingString:@"/doc2003_1.doc"]; 463 NSLog(@"#######%@",docPath); 464 NSURL *url = [NSURL fileURLWithPath:docPath]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; [webView loadRequest:request]; 465 [self.view addSubview:webView]; [webView release]; 466 From:http://blog.csdn.net/dadalan/archive/2010/10/22/5959301.aspx 467 iPhone 游戲中既播放背景音樂又播放特效聲音的辦法 468 有時候在 iPhone 游戲中,既要播放背景音樂,同時又要播放比如槍的開火音效。此時 您可以試試以下方法 469 NSString *musicFilePath = [[NSBundle mainBundle] pathForResource:fileName ofType:@"wav"]; //創建音樂文件路徑 470 NSURL *musicURL = [[NSURL alloc] initFileURLWithPath:musicFilePath]; 471 AVAudioPlayer* musicPlayer = [[AVAudioPlayer initWithContentsOfURL:musicURL error:nil]; 472 [musicURL release]; 473 [musicPlayer prepareToPlay]; 474 //[musicPlayer setVolume:1]; //設置音量大小 475 //musicPlayer .numberOfLoops = -1;//設置音樂播放次數 -1 為一直循環 476 要 導 入 框 架 AVFoundation.framework , 頭 文 件 中 <AVFoundation/AVFoundation.h>;做成類的話則更方便。 477 From: http://blog.csdn.net/dadalan/archive/2010/10/19/5950493.aspx 478 NSNotificationCenter 用于增加回調函數 479 alloc] 480 #import 481 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_willBecomeActive) name:UIApplicationDidBecomeActiveNotification object:nil]; 482 UINavigationBar 背景 Hack LOGO_320×44.png 圖片顯示在背景上, 484 @implementation UINavigationBar (UINavigationBarCategory) - (void)drawRect:(CGRect)rect { 485 //加入旋轉坐標系代碼 // Drawing code 486 UIImage *navBarImage = [UIImage imageNamed:@"LOGO_320×44.png"]; CGContextRef context = UIGraphicsGetCurrentContext(); CGContextTranslateCTM(context, 0.0, self.frame.size.height); CGContextScaleCTM(context, 1.0, -1.0); 487 CGPoint center=self.center; 488 CGImageRef cgImage= CGImageCreateWithImageInRect(navBarImage.CGImage, CGRectMake(0, 0, 1, 44)); 489 CGContextDrawImage(context, CGRectMake(center.x-160-80, 0, 80, self.frame.size.height), cgImage); 490 CGContextDrawImage(context, CGRectMake(center.x-160, 0, 320, self.frame.size.height), navBarImage.CGImage); 491 CGContextDrawImage(context, CGRectMake(center.x+160, 0, 80, self.frame.size.height), cgImage); 492 } @end 493 old code 494 CGContextDrawImage(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), navBarImage.CGImage); 495 hack 過 logo 不再拉伸 496 From: http://blog.163.com/fengyi1103@126/blog/static/13835627420106279102671/ 清除電話號碼中的其他符號(源碼) 497 最近從通訊錄讀取電話號碼,讀出得號碼如:134-1814-****。 而我需要的為 11 位純數字,一直找方法解決此問題,今天終于找到了。 501 代碼如下: 502 NSString *originalString = @"(123) 123123 abc"; NSMutableString *strippedString = [NSMutableString 503 stringWithCapacity:originalString.length]; 504 NSScanner *scanner = [NSScanner scannerWithString:originalString]; NSCharacterSet *numbers = [NSCharacterSet 505 characterSetWithCharactersInString:@"0123456789"]; 506 while ([scanner isAtEnd] == NO) { 507 NSString *buffer; 508 if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) { 509 [strippedString appendString:buffer]; } 510 // --------- Add the following to get out of endless loop else { 511 [scanner setScanLocation:([scanner scanLocation] + 1)]; } 512 // --------- End of addition } 513 NSLog(@"%@", strippedString); // "123123123" 514 From: http://stackoverflow.com/questions/1129521/remove-all-but-numbers-from-nsstring 515 正則判斷:字符串只包含字母和數字 516 NSString *mystring = @"Letter1234"; NSString *regex = @"[a-z][A-Z][0-9]"; 517 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex]; 518 if ([predicate evaluateWithObject:mystring] == YES) { //implement 519 } 520 一行代碼設置 UITableViewCell 與導航條間距
523 UITableView 的 cell 默認出現在 uitableview 的第一行,如果你想自定義 UITableViewCell 與導航條間距的話,可以使用下面這行代碼 524 tableview.tableHeaderView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 20)]autorelease]; 525 From: http://blog.163.com/fengyi1103@126/blog/static/1383562742010101611107492/ 526 修改 UITableview 滾動條顏色的方法 527 UITableview 的滾動條默認顏色是黑色的,如果 UItableview 背景也是深顏色,則 528 滾動條會變的很不明顯。您可以用下面這行代碼來改變滾動條的顏色 529 self.tableView.indicatorStyle=UIScrollViewIndicatorStyleWhite; 當然,最后的 “White” 也可以換成其它顏色。 530 下文件之前獲取到文件大小的代碼 531 下面這段代碼,能實現在下載文件之前獲得文件大小,應用在軟件里,能在很大程度 上改善用戶體驗 532 [m_pASIHTTPRequest setDidReceiveResponseHeadersSelector:@selector(didReceiveResponseHeaders:)]; 533 - (void)didReceiveResponseHeaders:(ASIHTTPRequest *)request { 534 NSLog(@"didReceiveResponseHeaders valueForKey:@"Content-Length"]); 535 } 536 網絡編程總結 iphone 一:確認網絡環境 3G/WIFI 537 1. 添加源文件和 framework 538 %@",[m_request.responseHeaders 539 開發 Web 等網絡應用程序的時候,需要確認網絡環境,連接情況等信息。如果沒 有處理它們,是不會通過 Apple 的審(我們的)查的。 540 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 541 Apple 的 例程 Reachability 中介紹了取得/檢測網絡狀態的方法。要在應用程序程 序中使用 Reachability,首先要完成如下兩部: 542 1.1. 添加源文件: 543 在你的程序中使用 Reachability 只須將該例程中的 Reachability.h 和 Reachability.m 拷貝到你的工程中。如下圖: 544 1.2.添加 framework: 545 將 SystemConfiguration.framework 添加進工程。如下圖: 546 2. 網絡狀態 547 Reachability.h 中定義了三種網絡狀態: typedef enum { 548 NotReachable = 0, ReachableViaWiFi, ReachableViaWWAN 549 } NetworkStatus; 550 因此可以這樣檢查網絡狀態: 551 //無連接 552 //使用 3G/GPRS 網絡 553 //使用 WiFi 網絡 554 Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”]; switch ([r currentReachabilityStatus]) { 555 } 556 case NotReachable: 557 // 沒有網絡連接 558 break; 559 case ReachableViaWWAN: 560 // 使用 3G 網絡 561 break; 562 case ReachableViaWiFi: 563 // 使用 WiFi 網絡 break; 564 3.檢查當前網絡環境 程序啟動時,如果想檢測可用的網絡環境,可以像這樣 // 是否 wifi 565 + (BOOL) IsEnableWIFI { 566 return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != 568 NotReachable); } 569 // 是否 3G 570 + (BOOL) IsEnable3G { 571 return ([[Reachability currentReachabilityStatus] != NotReachable); 572 } 573 例子: 574 - (void)viewWillAppear:(BOOL)animated { 575 reachabilityForInternetConnection] 576 if (([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable) && 577 NotReachable)) { 578 ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus == 579 self.navigationItem.hidesBackButton = YES; 580 [self.navigationItem setLeftBarButtonItem:nil animated:NO]; } 581 } 582 4. 鏈接狀態的實時通知 583 網絡連接狀態的實時檢查,通知在網絡應用中也是十分必要的。接續狀態發生變 化時,需要及時地通知用戶: 584 Reachability 1.5 版本 585 // My.AppDelegate.h #import "Reachability.h" 586 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { NetworkStatus remoteHostStatus; 587 } 588 @property NetworkStatus remoteHostStatus; 589 @end 590 // My.AppDelegate.m #import "MyAppDelegate.h" 591 @implementation MyAppDelegate @synthesize remoteHostStatus; 592 // 更新網絡狀態 594 - (void)updateStatus { 595 self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus]; 596 } 597 // 通知網絡狀態 598 - (void)reachabilityChanged:(NSNotification *)note { 599 [self updateStatus]; 600 if (self.remoteHostStatus == NotReachable) { 601 UIAlertView *alert = initWithTitle:NSLocalizedString(@"AppName", nil) 602 [[UIAlertView 603 alloc] 604 [alert show]; 605 [alert release]; } 606 } 607 message:NSLocalizedString (@"NotReachable", nil) delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; 608 // 程序啟動器,啟動網絡監視 609 - (void)applicationDidFinishLaunching:(UIApplication *)application { 610 // 設置網絡檢測的站點 611 [[Reachability sharedReachability] setHostName:@"www.apple.com"]; [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES]; 612 // 設置網絡狀態變化時的通知函數 613 [[NSNotificationCenter defaultCenter] addObserver:self 614 selector:@selector(reachabilityChanged:) 615 name:@"kNetworkReachabilityChangedNotification" object:nil]; [self updateStatus]; 616 } 617 - (void)dealloc { 618 // 刪除通知對象 619 [[NSNotificationCenter defaultCenter] removeObserver:self]; [window release]; 620 [super dealloc]; 621 } 622 Reachability 2.0 版本 623 // MyAppDelegate.h 624 retain]; 625 // 監測網絡情況 626 [[NSNotificationCenter defaultCenter] addObserver:self 627 selector:@selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil]; 628 hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] 629 hostReach startNotifer]; 631 @class Reachability; 632 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { Reachability *hostReach; 633 } @end 634 // MyAppDelegate.m 635 - (void)reachabilityChanged:(NSNotification *)note { 636 Reachability* curReach = [note object]; NSParameterAssert([curReach isKindOfClass: [Reachability class]]); NetworkStatus status = [curReach currentReachabilityStatus]; 637 if (status == NotReachable) { 638 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName"" 639 } } 640 message:@"NotReachable" 641 delegate:nil 642 cancelButtonTitle:@"YES" otherButtonTitles:nil]; [alert show]; 643 [alert release]; 644 - (void)applicationDidFinishLaunching:(UIApplication *)application { // ... 645 // ... } 646 二:使用 NSConnection 下載數據 647 1.創建 NSConnection 對象,設置委托對象 649 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[self urlString]]]; 650 [NSURLConnection connectionWithRequest:request delegate:self]; 651 2. NSURLConnection delegate 委托方法 652 - (void)connection:(NSURLConnection *)connection 653 didReceiveResponse:(NSURLResponse *)response; 654 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError 655 *)error; *)data; 656 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 657 // store data 658 [self.receivedData setLength:0]; //通常在這里先清空接受數據的緩 659 存 660 } 661 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { /* appends the new data to the received data */ 662 [self.receivedData appendData:data]; //可能多次收到數據,把新的數據 添加在現有數據最后 663 } 664 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 665 // 錯誤處理 } 666 - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // disconnect 667 [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 668 NSString *returnString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding]; 669 NSLog(returnString); 670 [self urlLoaded:[self urlString] data:self.receivedData]; firstTimeDownloaded = YES; 671 } 672 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData 673 - (void)connectionDidFinishLoading:(NSURLConnection *)connection; 674 3. 實現委托方法 676 三:使用 NSXMLParser 解析 xml 文件 677 1. 設置委托對象,開始解析 678 NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; //或者也可以 使用 initWithContentsOfURL 直接下載文件,但是有一個原因不這么做: 679 // It's also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable 680 // because it gives less control over the network, particularly in responding to connection errors. 681 [parser setDelegate:self]; [parser parse]; 682 2. 常用的委托方法 683 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 684 namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict; 685 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 686 qualifiedName:(NSString *)qName; 687 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string; 688 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError; static NSString *feedURLString = @"http://www.yifeiyang.net/test/test.xml"; 689 3. 應用舉例 690 - (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error { 691 NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; [parser setDelegate:self]; 692 [parser setShouldProcessNamespaces:NO]; 693 [parser setShouldReportNamespacePrefixes:NO]; 694 [parser setShouldResolveExternalEntities:NO]; [parser parse]; 695 NSError *parseError = [parser parserError]; 696 if (parseError && error) { 697 *error = parseError; } 698 [parser release];

701 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 702 attributes:(NSDictionary *)attributeDict{ // 元素開始句柄 703 if (qName) { 704 elementName = qName; 705 } 706 if ([elementName isEqualToString:@"user"]) { 707 // 輸出屬性值 708 NSLog(@"Name is %@ , Age objectForKey:@"name"], [attributeDict objectForKey:@"age"]); 709 } } 710 is %@", 711 [attributeDict 712 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 713 { 714 // 元素終了句柄 715 if (qName) { 716 elementName = qName; 717 } } 718 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { 719 // 取得元素的 text } 720 NSError *parseError = nil; 721 [self parseXMLFileAtURL:[NSURL parseError:&parseError]; 722 Iphone 實現畫折線圖 723 URLWithString:feedURLString] 724 iphone 里面要畫圖一般都是通過 CoreGraphics.framwork 和 QuartzCore.framwork 實現,apple 的官方 sdk demon 中包含了 QuartzCore 的基本用法, 725 qualifiedName:(NSString*)qName 726 qualifiedName:(NSString *)qName 727 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 728 具體 demo 請參考 http://developer.apple.com/library/ios/#samplecode/QuartzDemo/ 折線圖 729 要實現折線圖也就把全部的點連起來,movePointLineto,具體的調用里面的 api 就可以實現 了,但是畫坐標就比較麻煩了,里面需要去轉很多,好在國外有人開源了一個畫折線圖的開 發包,首先看看效果吧,具體怎么用可以參考作者 git 版本庫中的 wiki。 http://github.com/devinross/tapkulibrary/wiki/How-To-Use-This-Library 730 這個包還提供了其他的很好看的 UI,都可以調來用,但是我們只需要一個畫圖要把整個包 都導進去,工程太大了,既然是開源的那就想辦法提取出來吧,原先之前也有人干過這樣的 事。 http://duivesteyn.net/2010/03/07/iphone-sdk-implementing-the-tapku-graph-in-your-application/ 731  732 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 733 我對源代碼進行簡單的修改,使其顯示坐標之類的,更加符合工程的需要,但是還 沒有實現畫多組數據,只能畫一組數據,不用 viewContol,而使用 addsubview,直 接添加到當前的窗口,最終效果如下。 734 使用方法: 735 1.工程添加 tk 庫里面的如下文件 736 2. 添加 QuartzCore framework 737 #import <QuartzCore/QuartzCore.h> 738 添加 TapkuLibrary.bundle 資源文件 3.代碼中完成實例,數據初始化就可以用了 739 下載修改后的版本。下次有時間在整理一個工程版本出來。 740 讓 iPhone 屏幕常亮不變暗的方法 741 如果您希望運行自己開發的 App 時,iPhone 的屏幕不再自動變暗,可以使用以下方法 讓屏幕常亮: iPhone OS 用一個布爾值用來控制是否取消應用程序空閑時間: @property(nonatomic, getter=isIdleTime 742 如果您希望運行自己開發的 App 時,iPhone 的屏幕不再自動變暗,可以使用以下方法 讓屏幕常亮: 743  744 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 745 iPhone OS 用一個布爾值用來控制是否取消應用程序空閑時間:@property(nonatomic, getter=isIdleTimerDisabled) BOOL idleTimerDisabled。這個值的默認屬性是"NO"。當大多數 應用程序沒有接收到用戶輸入信息的時候,系統會把設備設置成“休眠”狀態,iPhone 屏幕 也會變暗。這樣做是為了保存更多電量。事實上,應用程序在運行加速度游戲的時候是不需 要用戶輸入的,當然這里只是一個假設,把這個變量設置為"YES",來取消系統休眠的“空 閑時間”。 746 重點是:你必須當真正需要的時候才打開這個屬性當你不用的時候馬上還愿成"NO"。 大多數應用程序在休眠時間到的時候讓系統關閉屏幕。這個包括了有音頻的應用程 序。在 Audio Session Services 中使用適當的回放和記錄功能不會被間斷當屏幕關閉時。只有地圖應 用程序,游戲或者一些不間斷的用戶交互程序可以取消這個屬性。 747 蘋果開發網絡編程知識總結 748 以下蘋果開發網絡編程知識由 CocoaChina 會員 cocoa_yang 總結,希望能為蘋果開發 新手梳理知識脈絡,節省入門時間。一:確認網絡環境 3G/WIFI 1. 添加源文件和 framework 開發 Web 等網絡應用程序 749 以下蘋果開發網絡編程知識由 CocoaChina 會員 “cocoa_yang” 總結,希望能為蘋 果開發新手梳理知識脈絡,節省入門時間。 750 一:確認網絡環境 3G/WIFI 751 1. 添加源文件和 framework 752 開發 Web 等網絡應用程序的時候,需要確認網絡環境,連接情況等信息。如果沒 有處理它們,是不會通過 Apple 的審查的。 753 Apple 的 例程 Reachability 中介紹了取得/檢測網絡狀態的方法。要在應用程序程 序中使用 Reachability,首先要完成如下兩部: 754 1.1. 添加源文件: 755 在你的程序中使用 Reachability 只須將該例程中的 Reachability.h 和 Reachability.m 拷貝到你的工程中。如下圖: 756 1.2.添加 framework: 757 將 SystemConfiguration.framework 添加進工程。如下圖: 758 2. 網絡狀態 759 Reachability.h 中定義了三種網絡狀態: typedef enum { 760 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 761 NotReachable = 0, ReachableViaWiFi, ReachableViaWWAN 762 } NetworkStatus; 763 因此可以這樣檢查網絡狀態: 764 //無連接 765 //使用 3G/GPRS 網絡 766 //使用 WiFi 網絡 767 Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”]; switch ([r currentReachabilityStatus]) { 768 case NotReachable: 769 // 沒有網絡連接 770 break; 771 case ReachableViaWWAN: 772 // 使用 3G 網絡 773 break; 774 case ReachableViaWiFi: 775 // 使用 WiFi 網絡 break; 776 } 3.檢查當前網絡環境 777 程序啟動時,如果想檢測可用的網絡環境,可以像這樣 // 是否 wifi 778 + (BOOL) IsEnableWIFI { 779 return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable); 780 } 781 // 是否 3G 782 + (BOOL) IsEnable3G { 783 return ([[Reachability currentReachabilityStatus] != NotReachable); 784 } 785 例子: 786 - (void)viewWillAppear:(BOOL)animated { 787 reachabilityForInternetConnection] 788 if (([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable) && 789 NotReachable)) { 790 ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus == 791 self.navigationItem.hidesBackButton = YES; [self.navigationItem setLeftBarButtonItem:nil animated:NO]; 792 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 793 } } 794 4. 鏈接狀態的實時通知 網絡連接狀態的實時檢查,通知在網絡應用中也是十分必要的。接續狀態發生變 795 化時,需要及時地通知用戶: 796 Reachability 1.5 版本 797 // My.AppDelegate.h #import "Reachability.h" 798 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { NetworkStatus remoteHostStatus; 799 } 800 @property NetworkStatus remoteHostStatus; 801 @end 802 // My.AppDelegate.m #import "MyAppDelegate.h" 803 @implementation MyAppDelegate @synthesize remoteHostStatus; 804 // 更新網絡狀態 805 - (void)updateStatus { 806 self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus]; } 807 // 通知網絡狀態 808 - (void)reachabilityChanged:(NSNotification *)note { 809 [self updateStatus]; 810 if (self.remoteHostStatus == NotReachable) { 811 UIAlertView *alert = initWithTitle:NSLocalizedString(@"AppName", nil) 812 [[UIAlertView 813 alloc] 814 [alert show]; 815 [alert release]; } 816 message:NSLocalizedString (@"NotReachable", nil) delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; 817 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 818 } 819 // 程序啟動器,啟動網絡監視 820 - (void)applicationDidFinishLaunching:(UIApplication *)application { 821 // 設置網絡檢測的站點 822 [[Reachability sharedReachability] setHostName:@"www.apple.com"]; [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES]; 823 // 設置網絡狀態變化時的通知函數 824 [[NSNotificationCenter defaultCenter] addObserver:self 825 selector:@selector(reachabilityChanged:) 826 name:@"kNetworkReachabilityChangedNotification" object:nil]; [self updateStatus]; 827 } 828 - (void)dealloc { 829 // 刪除通知對象 830 [[NSNotificationCenter defaultCenter] removeObserver:self]; [window release]; 831 [super dealloc]; 832 } 833 Reachability 2.0 版本 834 // MyAppDelegate.h @class Reachability; 835 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { Reachability *hostReach; 836 } @end 837 // MyAppDelegate.m 838 - (void)reachabilityChanged:(NSNotification *)note { 839 Reachability* curReach = [note object]; NSParameterAssert([curReach isKindOfClass: [Reachability class]]); NetworkStatus status = [curReach currentReachabilityStatus]; 840 if (status == NotReachable) { 841 retain]; 842 // 監測網絡情況 843 [[NSNotificationCenter defaultCenter] addObserver:self 844 selector:@selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil]; 845 hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] 846 hostReach startNotifer]; 847 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 848 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName"" message:@"NotReachable" 849 delegate:nil 850 cancelButtonTitle:@"YES" otherButtonTitles:nil]; [alert show]; 851 [alert release]; 852 } } 853 - (void)applicationDidFinishLaunching:(UIApplication *)application { // ... 854 // ... } 855 二:使用 NSConnection 下載數據 856 1.創建 NSConnection 對象,設置委托對象 857 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[self urlString]]]; 858 [NSURLConnection connectionWithRequest:request delegate:self]; 859 2. NSURLConnection delegate 委托方法 860 - (void)connection:(NSURLConnection *)connection 861 didReceiveResponse:(NSURLResponse *)response; 862 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError 863 *)error; *)data; 864 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData 865 - (void)connectionDidFinishLoading:(NSURLConnection *)connection; 3. 實現委托方法 866 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 867 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 868 // store data 869 [self.receivedData setLength:0]; //通常在這里先清空接受數據的緩 870 存 871 } 872 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { /* appends the new data to the received data */ 873 [self.receivedData appendData:data]; //可能多次收到數據,把新的數據 添加在現有數據最后 874 } 875 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 876 // 錯誤處理 } 877 - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // disconnect 878 [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 879 NSString *returnString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding]; 880 NSLog(returnString); 881 [self urlLoaded:[self urlString] data:self.receivedData]; firstTimeDownloaded = YES; 882 } 883 三:使用 NSXMLParser 解析 xml 文件 884 1. 設置委托對象,開始解析 885 NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; 使用 initWithContentsOfURL 直接下載文件,但是有一個原因不這么做: 886 //或者也可以 887 // It's also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable 888 // because it gives less control over the network, particularly in responding to connection errors. 889 [parser setDelegate:self]; [parser parse]; 890 2. 常用的委托方法 891 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 892 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 893 namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict; 894 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 895 qualifiedName:(NSString *)qName; 896 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string; 897 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError; static NSString *feedURLString = @"http://www.yifeiyang.net/test/test.xml"; 898 3. 應用舉例 899 - (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error { 900 NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; [parser setDelegate:self]; 901 [parser setShouldProcessNamespaces:NO]; 902 [parser setShouldReportNamespacePrefixes:NO]; 903 [parser setShouldResolveExternalEntities:NO]; [parser parse]; 904 NSError *parseError = [parser parserError]; 905 if (parseError && error) { 906 *error = parseError; } 907 [parser release]; } 908 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 909 attributes:(NSDictionary *)attributeDict{ // 元素開始句柄 910 if (qName) { 911 elementName = qName; 912 } 913 if ([elementName isEqualToString:@"user"]) { 914 // 輸出屬性值 915 NSLog(@"Name is %@ , Age objectForKey:@"name"], [attributeDict objectForKey:@"age"]); 916 } } 917 is %@", 918 [attributeDict 919 qualifiedName:(NSString*)qName 920 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 921 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 922 { 923 // 元素終了句柄 924 if (qName) { 925 elementName = qName; 926 } } 927 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { 928 // 取得元素的 text } 929 NSError *parseError = nil; 930 [self parseXMLFileAtURL:[NSURL parseError:&parseError]; 931 如何隱藏狀態欄 932 [ UIApplication sharedApplication ].statusBarHidden = YES; 933 .m 文件與.mm 文件的區別 934 .m 文件是 object-c 文件 935 .mm 文件相當于 c++或者 c 文件 936 URLWithString:feedURLString] 937 NSLog(@"afd")與 NSLog("afd") 938 細微差別會導致程序崩潰。 但是我不太明白為何蘋果要把編譯器做的對這兩種常量有區別。 不過值得一提的是可能為了方便蘋果自身的 NSObject 對象的格式化輸出。 safari 其實沒有把內存的緩存寫到存儲卡上 939 NSURLCache doesn't seem to support writing to disk on iPhone. The documentation for NSCachedURLResponse says that the NSURLCacheStoragePolicy "NSURLCacheStorageAllowed" is treated as "NSURLCacheStorageAllowedInMemoryOnly" by iPhone OS. 940 官方文檔是這么說的。 941 qualifiedName:(NSString *)qName 942 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 943  為了證明這個,我找到了一個目錄。 944 /private/var/mobile/Library/Caches/Safari/Thumbnails 945 隨機數的使用 946 頭文件的引用 947 #import <time.h> 948 #import <mach/mach_time.h> 949 srandom()的使用 950 srandom((unsigned)(mach_absolute_time() & 0xFFFFFFFF)); 951 直接使用 random() 來調用隨機數 在 UIImageView 中旋轉圖像 952 float rotateAngle = M_PI; 953 CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle); imageView.transform = transform; 954 以上代碼旋轉 imageView, 角度為 rotateAngle, 方向可以自己測試哦! 955 在 Quartz 中如何設置旋轉點 956 UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]]; 957 imageView.layer.anchorPoint = CGPointMake(0.5, 1.0); 這個是把旋轉點設置為底部中間。記住是在QuartzCore.framework中才得到支 958 持。 959 NSMutableDictionary *rootObj = [NSMutableDictionary dictionaryWithCapacity:4]; //NSDictionary, NSData 等文件可以直接轉化為 plist 文件 960 NSDictionary *innerDict; NSString *name; 961 Player *player; 962 創建.plist 文件并存儲 963 NSString *errorDesc; //用來存放錯誤信息 965 NSInteger saveIndex; 966 for(int i = 0; i < [playerArray count]; i++) { player = nil; 967 player = [playerArray objectAtIndex:i]; if(player == nil) 968 break; 969 name = player.playerName;// This "Player1" denotes the player name could 970 also be the computer name 971 innerDict = [self getAllNodeInfoToDictionary:player]; 972 [rootObj setObject:innerDict forKey:name]; // This "Player1" denotes the person who start this game 973 } 974 player = nil; NSData 975 dataFromPropertyList:(id)rootObj errorDescription:&errorDesc]; 976 *plistData 977 = [NSPropertyListSerialization format:NSPropertyListXMLFormat_v1_0 978 紅色部分可以忽略,只是給 rootObj 添加一點內容。這個 plistData 為創建好的 plist 文件,用其 writeToFile 方法就可以寫成文件。下面是代碼: 979 /*得到移動設備上的文件存放位置*/ 980 NSString *documentsPath = [self getDocumentsDirectory]; 981 NSString *savePath = [documentsPath 982 stringByAppendingPathComponent:@"save.plist"]; 983 /*存文件*/ 984 if (plistData) { 985 [plistData writeToFile:savePath atomically:YES]; } 986 else { 987 NSLog(errorDesc); 988 [errorDesc release]; 989 } 990 - (NSString *)getDocumentsDirectory { 991 NSArray *paths 992 NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); return [paths objectAtIndex:0]; 993 } 994 讀取 plist 文件并轉化為 NSDictionary 997 NSString *documentsPath = [self getDocumentsDirectory]; 998 NSString *fullPath stringByAppendingPathComponent:@"save.plist"]; 999 NSMutableDictionary* plistDict initWithContentsOfFile:fullPath]; 1000 讀取一般性文檔文件 1001 = [documentsPath 1002 NSString *tmp; 1003 NSArray *lines; /*將文件轉化為一行一行的*/ 1004 lines = [[NSString stringWithContentsOfFile:@"testFileReadLines.txt"] 1005 componentsSeparatedByString:@"\n"]; NSEnumerator *nse = [lines objectEnumerator]; 1006 // 讀取<>里的內容 1007 while(tmp = [nse nextObject]) { 1008 } 1009 = [[NSMutableDictionary 1010 alloc] 1011 NSString *stringBetweenBrackets = nil; 1012 NSScanner *scanner = [NSScanner scannerWithString:tmp]; [scanner scanUpToString:@"<" intoString:nil]; 1013 [scanner scanString:@"<" intoString:nil]; 1014 [scanner scanUpToString:@">" intoString:&stringBetweenBrackets]; 1015 NSLog([stringBetweenBrackets description]); 1016 對于讀寫文件,還有補充,暫時到此。隨機數和文件讀寫在游戲開發中經常用到。所 以把部分內容放在這,以便和大家分享,也當記錄,便于查找。 1017 隱藏 NavigationBar 1018 [self.navigationController setNavigationBarHidden:YES animated:YES]; 1019 在想隱藏的 ViewController 中使用就可以了。 1020 如何在 iPhone 程序中調用外部命令 1021 下面是如何在 iPhone 非官方 SDK 程序中調用外部命令的方法。 1022 - ( NSString * ) executeCommand : ( NSString * ) cmd { NSString * output = [ NSString string ] ; FILE * pipe = popen ( [ cmd cStringUsingEncoding : NSASCIIStringEnc 1024 下面是如何在 iPhone 非官方 SDK 程序中調用外部命令的方法。 1025 - (NSString *)executeCommand: (NSString *)cmd { 1026 NSString *output = [NSString string]; 1027 FILE *pipe = popen([cmd cStringUsingEncoding: NSASCIIStringEncoding], "r"); if (!pipe) return; 1028 char buf[1024]; 1029 while(fgets(buf, 1024, pipe)) { 1030 output = [output stringByAppendingFormat: @"%s", buf]; 1031 } 1032 pclose(pipe); return output; } 1033 NSString *yourcmd = [NSString stringWithFormat: @"your command"]; [self executeCommand: yourcmd]; 1034 如何在 iPhone 程序讀取數據時顯示進度窗 1035 下面代碼說明如何使用 iPhone 非官方 SDK 在讀取數據時顯示進度條。 以下代碼參考了 MobileRss。 1036 定義頭文件: 1037 #import "uikit/UIProgressHUD.h" 1038 @interface EyeCandy : UIApplication { UIProgressHUD *progress; 1039 } 1040 - (void) showProgressHUD:(NSString *)label withWindow:(UIWindow *)w withView:(UIView *)v withRect:(struct CGRect)rect; 1041 - (void) hideProgressHUD; .@end 上面的引號要改成<>。 1042 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 1043 import "EyeCandy.h" 1044 @implementation EyeCandy 1045 - (void)showProgressHUD:(NSString *)label withWindow:(UIWindow *)w withView:(UIView *)v withRect:(struct CGRect)rect 1046 { 1047 progress = [[UIProgressHUD alloc] initWithWindow: w]; [progress setText: label]; 1048 [progress drawRect: rect]; 1049 [progress show: YES]; 1050 [v addSubview:progress]; } 1051 - (void)hideProgressHUD { 1052 [progress show: NO]; 1053 [progress removeFromSuperview]; } 1054 @end 1055 使用下面代碼調用: 1056 // Setup Eye Candy View 1057 _eyeCandy = [[[EyeCandy alloc] init] retain]; 1058 // Call loading display 1059 [_eyeCandy showProgressHUD:@"Loading ..." withWindow:window withView:mainView withRect:CGRectMake(0.0f, 100.0f, 320.0f, 50.0f)]; 1060 // When finished for hiding the &quot;loading text&quot; [_eyeCandy hideProgressHUD]; 1061 WebKit 的基本用法 1062 WebKit 是蘋果開發中比較常用的瀏覽器引擎,Safari 使用的正是 WebKit 引擎。WebKit 基于 KDE 的 KHTML 加以再開發,解析速度超過了以往所有的瀏覽器。這里簡單記錄一下 WebKit 的基本用法。 1063 WebKit 由下面的結構組成: 1064 更多蘋果移動應用開發入門精選文檔教程薈萃:http://down.51cto.com/zt/2401 1065 ?DomCore ?JavaScriptCore ?WebCore 一般瀏覽 1066 要打開網頁,可以這樣做: 1067 1.[[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlText]]]; 1068 DomCore 1069 DomCore 用于處理 DOM 文檔,包括: 1070 ?DOMDocument 1071 ?DOMNamedNodeMap 1072 ?DOMNode 1073 ?DOMNodeList 1074 要獲取一個 DOMDocument,可以這樣做: 1075 1.DOMDocument *myDOMDocument = [[webView mainFrame] DOMDocument]; 1076 要用于 HTML 處理,可以使用 DOMHTMLDocument(Mac OS X 10.4 之后),獲取方式 相同: 1077 1.DOMHTMLDocument *myDOMDocument = (DOMHTMLDocument*)[[webView mainFrame] DOMDocument]; 1078 方法定義: 1079 蘋果的 WebKit 更新說明 JavaScriptCore 1080 在 WebKit 中執行腳本的方法: 1081 1.WebScriptObject *myscript = [webView windowScriptObject]; 2.NSString *script = @"alert('hello');"; 1082 3.[myscript evaluateWebScript script]; 1083 參考: 1084 http://www.macgood.com/thread-24636-1-1.html http://www.cocoadev.com/index.pl?WebKit 1086 為什么不要做 iPhone 上面的應用 1087 簡單來說就是因為兩國的文化不同,或者說生活方式的不同。美國不管多窮的人都有 車,他們平時的生活方式和國內絕對是完全不同的。做應用和做游戲不一樣,應用需要滿足 人們某一 1088 簡單來說就是因為兩國的文化不同,或者說生活方式的不同。美國不管多窮的人 都有車,他們平時的生活方式和國內絕對是完全不同的。做應用和做游戲不一樣,應用需要 滿足人們某一部分的需求,比如,一個計算小費的軟件,在國內不會有市場,可是美國人都 有一個。 1089 大家可以設身處地的想一下,誰會需要你做的軟件,這樣的人有多少,這樣的人又有 iPhone 的又有多少。 1090 對于應用來說,針對商務人士的又比針對普通人的好,基本上商務人士不太在乎幾塊 錢一個軟件,這也是 backup assistant 賣得最好的一個原因。這個軟件一年的年費 24 美元, 大約有數千萬美元一年的收入。什么樣的應用軟件是這些人需要的?連筆者自己也不太清 楚,筆者雖然已經在美國工作了多年,但是對于美國文化的了解還處于一知半解狀態,更不 用說正在留學的學生了。 1091 還有一個能成功的應用軟件是你已經有非常多的數據,比如你有當地的所有加油站的 信息,做一個油價的地圖軟件,顯然市場會不錯。不過數據要是美國的數據,國內的沒有太 大的幫助。 1092 綜上所述,游戲比應用好做很多,如果要作應用的話,可以從單機的小應用開始。要 在美國運營一個支持 10 萬人的網絡應用,沒有 30 萬美元絕對沒戲。如果非要上,只能早死 早超生了。 1093 獲取 iPhone 用戶手機號 1094 使用下面的函數可以返回用戶的手機號: 1095 extern NSString *CTSettingCopyMyPhoneNumber(); 1096 然后調用即可。 1097 由于這個函數是包含在 CoreTelephony 中,所以只能用于非官方 iPhone SDK。 1098 在程序中關閉 iPhone 1099 首先在程序中引用 #include sys/reboot.h 然后使用 reboot(RB_HALT); 就可以直接將 iPhone 關機。 1100 首先在程序中引用 1101 1102 #include <sys/reboot.h> 1103 然后使用 1104 reboot(RB_HALT); 1105 就可以直接將 iPhone 關機。 1106 convert the contents of an NSData object to an NSString 1107 1. NSString *stringFromASC = [NSString stringWithCString:[ascData bytes] length:[ascData length]]; 1108 If the NSData object contains unichar characters then do this: 1109 NSString *stringFromUnichar = [NSString stringWithCharacters:[unicharData bytes] length:[unicharData length] / sizeof(unichar)]; 1110 2. - (id)initWithData:(NSData *)data encoding:(NSStringEncoding)encoding 1111 iPhone 的特殊 URL 1112 在 iPhone 中,可以直接用 UIApp 打開 URL 地址。如下所示: 1113 1.[ UIApp openURL: [ NSURL URLWithString:@"http://www.apple.com" ] ]; 1114 或者: 1115 1.[ UIApp openURL: [ NSURL URLWithString:@"mailto:apple@mac.com?Subject=hello" ] ]; 1116 與此同時,iPhone 還包含一些其他除了 http://或者 mailto:之外的 URL: sms:// 可以調用短信程序 1117 tel:// 可以撥打電話 1118 itms:// 可以打開 MobileStore.app 1119 audio-player-event:// 可以打開 iPod audio-player-event://?uicmd=show-purchased-playlist 可以打開 iPod 播放列表 video-player-event:// 可以打開 iPod 中的視頻 1121 get iphone uniqueIdentifier 1122 I also find that I can get uniqueIdentifier using: 1123 UIDevice *myDevice = [UIDevice currentDevice];NSString *identifier = myDevice.uniqueIdentifier; 1124 打開本地網頁,與遠程網頁 1125 fileURLWithPath:Initializes and returns a newly created NSURL object as a file URL with a specified path. 1126 + (id)fileURLWithPath:(NSString *)path 1127 URLWithString: 1128 Creates and returns an NSURL object initialized with a provided string. 1129 + (id)URLWithString:(NSString *)URLString 1130 教你如何使用 UIWebView 1131 Start by opening up the WebBrowserTutorialAppDelegate.h file and editing the @interface 1132 line to read: 1133 @interface WebBrowserTutorialAppDelegate : NSObject <UIWebViewDelegate> { 1134 What we have done is to make the main AppDelegate a delegate for the UIWebView as well. 1135 Now we need to set our webView to have the main AppDelegate as its delegate, you can do this by opening up WebBrowserTutorialAppDelegate.m and putting the following line just inside theapplicationDidFinishLaunching function: 1136 webView.delegate = self; 1137 That is all pretty self explanatory, it just sets the delegate of our webView to self, which in this case is our main application delegate. 1138 Now we are pretty much done, we just need to add the function to catch the link clicks. To do this we need to add a new function, copy the content below to the WebBrowserTutorialAppDelegate.m file: 1139 - (BOOL)webView:(UIWebView*)webView 1141 shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType { 1142 NSURL *url = request.URL; 1143 NSString *urlString = url.absoluteString; NSLog(urlString); 1144 return YES; 1145 } 1146 This function will catch all requests and allow you to either manipulate them and pass them on or to perform your own custom action and stop the event from bubbling. 1147 The first line gets the URL of the request, this is the contents inside the href attribute in the anchor tag. 1148 The next line converts the URL to a string so we can log it out. You can access many parts of the NSURL, here are some of them and brief description of what they do. 1149 * absoluteString - An absolute string for the URL. Creating by resolving the receiver’s string against its base. 1150 * absoluteURL - An absolute URL that refers to the same resource as the receiver. If the receiver is already absolute, returns self. 1151 * baseURL - The base URL of the receiver. If the receiver is an absolute URL, returns nil. 1152 * host - The host of the URL. 1153 * parameterString - The parameter string of the URL. 1154 * password - The password of the URL (i.e. http://user:pass@www.test.com would return 1155 pass) 1156 * path - Returns the path of a URL. 1157 * port - The port number of the URL. 1158 * query - The query string of the URL. 1159 * relativePath - The relative path of the URL without resolving against the base URL. If the 1160 receiver is an absolute URL, this method returns the same value as path. 1161 * relativeString - string representation of the relative portion of the URL. If the receiver is an 1162 absolute URL this method returns the same value as absoluteString. 1163 * scheme - The resource specifier of the URL (i.e. http, https, file, ftp, etc). * user - The user portion of the URL. 1164 Then the third line simply logs the URL to the console, so you will new to open up the console while you run this in the simulator to see the results. 1165 Finally the forth line returns YES, this will allow the UIWebView to follow the link, if you would just like to catch a link and stop the UIWebView from following it then simply return NO. 1166 UIBUtton title image 不能同時顯示 1168 [ leftbutton setTitle:_(@"About") forState:UIControlStateNormal ]; 1169 [ leftbutton setImage:image forState:UIControlStateNormal ]; 1170 不能同時顯示。 其他控件如:UINavigatonItem 1171 不要在語言包里面設置空格 1172 有時,為了界面的需要,我們不要在語言包里面加空格,要在程序中進行控制。 1173 buttonTitle = [ NSString stringWithFormat:@" %@", _(@"updateWeb") ]; 1174 NSNotificationCenter 帶參數發送 1175 MPMoviePlayerController* theMovie = [[MPMoviePlayerController 1176 alloc]initWithContentURL:[NSURL fileURLWithPath:[[[tableTitles objectAtIndex:row] objectAtIndex:3] ]]; 1177 [[NSNotificationCenter defaultCenter] selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie]; 1178 [theMovie play]; -(void)myMovieFinishedCallback:(NSNotification*)aNotification { 1179 MPMoviePlayerController *theMovie = [aNotification object]; 1180 [[NSNotificationCenter defaultCenter] name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie]; 1181 // Release the movie instance [theMovie release]; } 1182 ------------ 1183 MPMoviePlayerController* theMovie = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL fileURLWithPath:[[[tableTitles objectForKey:keyIndex] 1184 objectForKey:keyIndex] 1185 addObserver:self 1186 removeObserver:self 1188 objectAtIndex:row] objectAtIndex:3] ]]; 1189 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie userInfo:dic]; 1190 [theMovie play]; 1191 -(void)myMovieFinishedCallback:(NSNotification*)aNotification 1192 { 1193 MPMoviePlayerController *theMovie = [aNotification object]; 1194 [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie]; 1195 // Release the movie instance [theMovie release]; 1196 } 1197 延時一段時間執行某一函數 1198 [self performSelector:@selector(dismissModal) withObject:self afterDelay:1.0]; 1199 無 99 美金證書聯機開發 1200 第一步:進入 cd /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk/ sudo vi SDKSettings.plist,將 CODE_SIGNING_REQUIRED 的值改成 NO. 保存后退出. 1201 第二步:重新啟動 XCode 項目. 1202 第三步:右擊項目 GetInfo.將 Code Signing 下的 Code Signing Identity 值設置成 Don't Code 1203 Sign, 將 Code Signing Identity 下的 Any iOS Device 的值設置成空. 1204 獲取 IOS 設備的基本信息 系統唯一標識 1205 是什么設備:iPad 還是 iPhone 等 iOS 版本號 1206 系統名稱 1207 [[UIDevice currentDevice] uniqueIdentifier], 1209 [[UIDevice currentDevice] localizedModel], [[UIDevice currentDevice] systemVersion], [[UIDevice currentDevice] systemName], [[UIDevice currentDevice] model]]; 1210 用 NSDateFormatter 調整時間格式的代碼 1211 在開發 iOS 程序時,有時候需要將時間格式調整成自己希望的格式,這個時候我們可 以用 NSDateFormatter 類來處理。 1212 例如: 1213 //實例化一個 NSDateFormatter 對象 1214 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 1215 //設定時間格式,這里可以設置成自己需要的格式 1216 [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 1217 //用[NSDate date]可以獲取系統當前時間 1218 NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]]; 1219 //輸出格式為:2010-10-27 10:22:13 1220 NSLog(@”%@”,currentDateStr); 1221 //alloc 后對不使用的對象別忘了 release 1222 [dateFormatter release]; 1223 UIView 設置成圓角方法 1224 m_mainImgView.layer.cornerRadius = 6; m_mainImgView.layer.masksToBounds = YES; 1225 iPhone 里的 frame 和 bounds 區別 1234 所有內存管理的原則全在這里! 1235 簡單??哈哈! 1236 名人曰:“大道至簡” 這兒玩意兒說起來比過家家還容易,但其實有些事情真正做起來并不是簡單的事兒~~ 1237 咱們首先來說怎么樣才能成為一個對象的擁有者。Cocoa 提供了一個機制叫"reference counting",翻譯過來就是“關聯記數器”(自己翻譯的,真不知叫啥,如果有官方的翻譯請 通知我)。每一個對象都有一個關聯記數的值。當它被創建時,它的值為“1”。當值減少到 “0”時,就會被回收(調用它的 deallocate 方法,如果沒有寫,則調用從 NSObject 繼承而來 的回收方法,下文有說,一定要重寫該方法)。以下幾個方法可以操作這個記數: 1238 1,alloc 為對象分配內存,記數設為“1”,并返回此對象。 1239 2,copy 復制一個對象,此對象記數為“1”,返回此對象。你將成為此克隆對象的擁有者 1240 3,retain 對象“關聯記數”加“1”,并成為此對象的擁有者。 1241 4,release 對象“關聯記數”減“1”,并丟掉此對象。 1242 5,autorelease 在未來的某一時刻,對象“關聯記數”減“1”。并在未來的某個時間放棄此對象。 1243 有了上面的幾個方法(當然這也是所有的內存操作的方法,簡單吧,哈哈哈)你就可 以隨意操作一個對象的記數。并部分或完全的控制它的生命周期。但實際應用中,隨意亂寫 上面的任何一個方法都可能會帶來嚴重的內存泄露。混亂的內存分配等于沒完沒了的麻煩工 作,你不想在情人節的日子還在為記數之類的鳥問題而丟了老婆吧~~哈哈哈,為了美麗溫 柔賢惠又善解人意的準老婆請牢記以下四條: 1244 1,一個代碼塊內要確保 copy, alloc 和 retain 的使用數量與 release 和 autorelease 的 數量。 1245 2,在使用以“alloc”或“new”開頭或包含“copy”的方法,或“retain”一個對象時, 你就會變為它的擁有者。 1247 3,實現“dealloc”方法,并施放所有的實例變量。(其實這里還有很多的巧兒門!!) 4,永不自己調用“dealloc”方法,這是系統當“retain”減到“0”時,自動調用的。 1248 手動調用會引起 retain count 記數錯誤(多一次的 release)。 其實做到這些也不難, 1249 retain count 增加與減少的方法對應,板丁板做到了就行了。 來自:http://blog.csdn.net/dboylx/archive/2009/02/13/3888746.aspx iphone 更改鍵盤右下角按鍵的 type 1250 以 UISearchBar 為例。 1251 創建 mySearchBar: 1252 mySearchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, SEARCH_HEIGHT)]; 1253 mySearchBar.placeholder = curPath; [mySearchBar setDelegate:self]; //tableView.tableHeaderView =mySearchBar; [self.view addSubview:mySearchBar]; 1254 0,320, 1255 更改按鍵的 keyType(默認是 return,這里將它更改成 done,當然還可以更改成其他的): UITextField *searchField = [[mySearchBar subviews] lastObject]; 1256 [searchField setReturnKeyType:UIReturnKeyDone]; 1257 [mySearchBar release];

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轉載于:https://www.cnblogs.com/Ruby-Hua/p/5134995.html

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