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幾個經常需要自定義的組件：UIScrollview、UItextView、UIButton

分類：?Iphone應用開發?2011-12-28 15:13?136人閱讀?評論(0)?收藏?舉報

為了獨立出組件的一些功能，如，為UIbutton切換背景圖片，我們經常需要自定義一些組件，下面是我經常用到的，先總結出來，以后會慢慢更新：

－：UIScroview

srollview的事件經常與其子view事件沖突，截斷子view事件的相應

//傳遞touch事件

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event

{

???if(!self.dragging)

?????

??{

? ? ? ? [[selfnextResponder]touchesBegan:toucheswithEvent:event];

??}

???

??[supertouchesBegan:touches?withEvent:event];

???

??// NSLog(@"MyScrollView touch Began");

}

?

- (void)touchesMoved:(NSSet?*)touches withEvent:(UIEvent?*)event

{

???if(!self.dragging)

??{

? ? ? ? [[selfnextResponder]touchesMoved:toucheswithEvent:event];

??}

??[supertouchesMoved:touches?withEvent:event];

}

?

?

?

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event

{

???if(!self.dragging)

??{

? ? ? ? [[selfnextResponder]touchesEnded:toucheswithEvent:event];

??}

??[supertouchesEnded:touches?withEvent:event];

}

?

[plain]?view plaincopy

??

?

//父視圖是否可以將消息傳遞給子視圖，yes是將事件傳遞給子視圖，則不滾動，no是不傳遞則繼續滾動

- (BOOL)touchesShouldBegin:(NSSet?*)touches withEvent:(UIEvent?*)event inContentView:(UIView?*)view

{

??if?([view?isKindOfClass:[CustomUITextViewclass]])

??{

?????return?YES;

??}

??else?

??{

?? ?returnNO;

???

??}

?

}

?

//Yes是子視圖取消繼續接受touch消息（可以滾動），NO是子視圖可以繼續接受touch事件（不滾動）

//默認的情況下當view不是一個UIControlo類的時候，值是yes,否則是no?

//調用情況是這樣的一般是在發送tracking messages消息后會調用這個函數，來判斷scroll是否滾動，還是接受子視圖的touch事件

- (BOOL)touchesShouldCancelInContentView:(UIView?*)view

{

??NSLog(@"用戶點擊的視圖?%@",view);

? ?returnNO;

}?

二：UITextView默認是沒有邊框的，可以給它加個凹下去的邊框

-(void) drawRect:(CGRect)rect {

???

? ? [self.layersetBackgroundColor: [[UIColorwhiteColor]CGColor]];

? ? [self.layersetBorderColor: [[UIColorgrayColor]CGColor]];

? ? [self.layersetBorderWidth:1.0];

? ? [self.layersetCornerRadius:8.0f];

? ? [self.layersetMasksToBounds:YES];

? ?UIGraphicsBeginImageContext(self.frame.size);

? ?CGContextRef?currentContext =UIGraphicsGetCurrentContext();

??CGContextSetLineWidth(currentContext,?2.0);

??CGContextSetRGBStrokeColor(currentContext,?0.6,0.6,.6,?1.0);

??CGRect?myRect =?CGContextGetClipBoundingBox(currentContext); ?

??float?myShadowColorValues[] = {0,0,0,1};

? ?CGColorSpaceRef?myColorSpace =CGColorSpaceCreateDeviceRGB();

??CGColorRef?colorRef =?CGColorCreate(myColorSpace, myShadowColorValues);

??CGContextSetShadowWithColor(currentContext,?CGSizeMake(-1,1),2, colorRef);

???

??CGContextStrokeRect(currentContext, myRect);

? ?UIImage?*backgroundImage = (UIImage?*)UIGraphicsGetImageFromCurrentImageContext();

? ?UIImageView?*myImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,0,self.frame.size.width,self.frame.size.height)];

??[myImageView?setImage:backgroundImage];

??[selfaddSubview:myImageView];

??[myImageView?release];

? ?UIGraphicsEndImageContext();

}

三：我們會想按下按鈕時，切換button的圖片背景，可以給UIbutton加個UIControllEvent事件的消息通知，當按鈕被按下的時候，通知按鈕所有者去切換圖片

- (id)initWithFrame:(CGRect)_frame? {

if?(self?= [superinitWithFrame:_frame]) {

[selfaddTarget:selfaction:@selector(touchDown:)forControlEvents:UIControlEventTouchDown];

[selfaddTarget:selfaction:@selector(touchUpInside:)forControlEvents:UIControlEventTouchUpInside];

//[selfaddTarget:selfaction:@selector(touchUpOutside:)forControlEvents:UIControlEventTouchUpOutside];

}

?

returnself;

}

?

- (void)touchDown:(id)sender {

NSNotification?*notification = [NSNotificationnotificationWithName:@"TouchDownButton"object:selfuserInfo:nil];

[[NSNotificationCenterdefaultCenter]postNotification:notification];

NSLog(@"%s",__FUNCTION__);

}

?

- (void)touchUpInside:(id)sender {

//[self setBackgroundImage:@"next.png" forState:UIControlStateNormal];

NSNotification?*notification = [NSNotificationnotificationWithName:@"TouchUpButton"object:selfuserInfo:nil];

[[NSNotificationCenterdefaultCenter]postNotification:notification];

?

}

使用方法

在所有者類中定義這些自定義的組件，如定義

CustomerButton?*nextButton;

監聽消息

[notification?addObserver:self?selector:@selector(touchDownNext)?name:@"TouchDownButton"?object:nil];

[notification?addObserver:self?selector:@selector(touchUpNext)?name:@"TouchUpButton"?object:nil];

監聽到后需要執行的動作

-(void)touchDownNext{

UIImage?*image = [UIImageimageNamed:@"next_pressed.png"];

[nextButtonsetBackgroundImage:imageforState:UIControlStateHighlighted];

}

?

-(void)touchUpNext{

UIImage?*image = [UIImageimageNamed:@"next.png"];

[nextButtonsetBackgroundImage:imageforState:UIControlStateNormal];

}

轉載于:https://my.oschina.net/u/2473136/blog/516177

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