1.拖一個Scroll View視圖填充View窗口，將Scroll View視圖拖大一些，使其超出屏幕。
2.向Scroll View拖（添加）多個Label視圖和Text View視圖。
3.在.h頭文件中添加如下代碼：
[cpp] view plaincopyprint?
#import?<UIKit/UIKit.h> ?? ?? @interface?ShowTextFiled?:?UIViewController?{?? ????IBOutlet?UIScrollView?*myscrollview;?? ?????? ????UITextField?*?currentTextfield;?? ????BOOL }?? @property?(nonatomic,retain)UIScrollView?*myscrollview;?? ?? @end??
#import <UIKit/UIKit.h>@interface ShowTextFiled : UIViewController {IBOutlet UIScrollView *myscrollview;UITextField * currentTextfield;//當前的文本筐BOOL keyboardIsShown;
}
@property (nonatomic,retain)UIScrollView *myscrollview;@end
4.在Interface Builer中，將每個Text Field的delegate連接到File‘s Owner。這一步很重要，因為它使得文本筐的各種事件如：textFieldDidBeginEditing。textFieldDidEndEditing等可被試圖控制器處理。
5.在viewDidLoad方法里面修改ScrollView的內容大小：
[cpp] view plaincopyprint?
-?(void {?? ?????? ????myscrollview.frame?=?CGRectMake(0,?0,?320,?460);?? ????[myscrollview?setContentSize:CGSizeMake(320,651?)];?? ????[super?viewDidLoad];?? ?????? }??
- (void)viewDidLoad
{//下面這兩句話必須寫，否則scrollview不可以動myscrollview.frame = CGRectMake(0, 0, 320, 460);[myscrollview setContentSize:CGSizeMake(320,651 )];[super viewDidLoad];// Do any additional setup after loading the view from its nib.
}
6.在View窗口顯示以前注冊兩個通知，這兩個通知可以告訴你鍵盤何時顯示或消失，在viewWillAppear方法里面注冊：
[cpp] view plaincopyprint?
?? -(void BOOL ?????? ????[[NSNotificationCenter?defaultCenter]??? ?????addObserver:self?? ?????selector:@selector(keyboardDidShow:)??? ?????name:UIKeyboardDidShowNotification?? ?????object:self.view.window];?? ?????? ????[[NSNotificationCenter?defaultCenter]?? ?????addObserver:self?? ?????selector:@selector(keyboardDidHide:)??? ?????name:UIKeyboardDidHideNotification??? ?????object:nil];?? }??
//頁面加載前調用的方法,注冊兩個通知：一個是鍵盤彈出來的通知，另外一個是鍵盤隱藏的通知，不同的通知調用不同的方法進行處理
-(void) viewWillAppear:(BOOL)animated{//鍵盤彈起的通知[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotificationobject:self.view.window];//鍵盤隱藏的通知[[NSNotificationCenter defaultCenter]addObserver:selfselector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
}
7.上面的通知中，當鍵盤彈起的時候會調用
keyboardDidShow方法，當鍵盤消失會調用keyboardDidHide方法，這兩個方法定義如下：
[cpp] view plaincopyprint?
?? -(void ????if ????????return ????}?? ????NSDictionary?*?info?=?[notification?userInfo];?? ????NSValue?*avalue?=?[info?objectForKey:UIKeyboardFrameEndUserInfoKey];?? ????CGRect?keyboardRect?=?[self.view?convertRect:[avalue?CGRectValue]?fromView:nil];?? ????CGRect?viewFrame?=?[myscrollview?frame];?? ????viewFrame.size.height?-=?keyboardRect.size.height;?? ????myscrollview.frame?=?viewFrame;?? ????CGRect?textFieldRect?=?[currentTextfield?frame];?? ????[myscrollview?scrollRectToVisible:textFieldRect?animated:YES];?? ????keyboardIsShown?=?YES;?? }??
//鍵盤彈起后處理scrollView的高度使得textfield可見
-(void)keyboardDidShow:(NSNotification *)notification{if (keyboardIsShown) {return;}NSDictionary * info = [notification userInfo];NSValue *avalue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];CGRect keyboardRect = [self.view convertRect:[avalue CGRectValue] fromView:nil];CGRect viewFrame = [myscrollview frame];viewFrame.size.height -= keyboardRect.size.height;myscrollview.frame = viewFrame;CGRect textFieldRect = [currentTextfield frame];[myscrollview scrollRectToVisible:textFieldRect animated:YES];keyboardIsShown = YES;
}
[cpp] view plaincopyprint?
?? -(void ????NSDictionary?*info?=?[notification?userInfo];?? ????NSValue?*avalue?=?[info?objectForKey:UIKeyboardFrameEndUserInfoKey];?? ????CGRect?keyboardRect?=?[self.view?convertRect:[avalue?CGRectValue]?fromView:nil];?? ????CGRect?viewFrame?=?[myscrollview?frame];?? ????viewFrame.size.height?+=?keyboardRect.size.height;?? ????myscrollview.frame?=?viewFrame;?? ????keyboardIsShown?=?NO;?? }??
//鍵盤隱藏后處理scrollview的高度，使其還原為本來的高度
-(void)keyboardDidHide:(NSNotification *)notification{NSDictionary *info = [notification userInfo];NSValue *avalue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];CGRect keyboardRect = [self.view convertRect:[avalue CGRectValue] fromView:nil];CGRect viewFrame = [myscrollview frame];viewFrame.size.height += keyboardRect.size.height;myscrollview.frame = viewFrame;keyboardIsShown = NO;
}
8.重寫TextField的三個事件方法：
當點擊TextField視圖時會促發如下方法：這個方法會將當前點擊的文本筐賦值給currentTextField成員變量
[cpp] view plaincopyprint?
-(void ????currentTextfield?=?textFieldView;?? }??
-(void)textFieldDidBeginEditing:(UITextField *)textFieldView{currentTextfield = textFieldView;
}當用戶點擊鍵盤中的Return鍵時，會促發如下方法：
[cpp] view plaincopyprint?
-(BOOL ????[textFieldView?resignFirstResponder];?? ????return }??
-(BOOL)textFieldShouldReturn:(UITextField *)textFieldView{[textFieldView resignFirstResponder];return NO;
}
上一個方法中的resignFirstResponder會隱藏鍵盤，這樣會促發另外一個方法：這里將currentTextField設為nil
[cpp] view plaincopyprint?
-(void ????currentTextfield?=?nil;?? }??
-(void)textFieldDidEndEditing:(UITextField *)textFieldView{currentTextfield = nil;
}
9.最后不要忘了在View窗口關閉之前移除前面注冊的通知：
[cpp] view plaincopyprint?
?? -(void BOOL ????[[NSNotificationCenter?defaultCenter]?? ?????removeObserver:self?? ?????name:UIKeyboardDidShowNotification?? ?????object:nil];?? ?????? ????[[NSNotificationCenter?defaultCenter]?? ?????removeObserver:self?? ?????name:UIKeyboardDidHideNotification?? ?????object:nil];?? }??
//頁面消失前取消通知
-(void)viewWillDisappear:(BOOL)animated{[[NSNotificationCenter defaultCenter]removeObserver:selfname:UIKeyboardDidShowNotificationobject:nil];[[NSNotificationCenter defaultCenter]removeObserver:selfname:UIKeyboardDidHideNotificationobject:nil];
}
生命在于運動，先去打球，晚上回來在繼續，哈哈。
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