iOS對鍵盤的處理

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方法１.　使用<UITextFeildDelegate>,使用的UITextField樣本 設定其Delegate為self，點擊return按鈕隱藏鍵盤。實現函數如下：   - (BOOL)textFieldShouldReturn:(UITextField *)textField  
   {   
         [textField resignFirstResponder];           return YES;
   }    方法2. 點擊介面的其它空白地方隱藏
     由於UIViewController是繼承自UIResponder的，所以可以覆寫- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;這個開始觸摸的方法來取消第一響應者，代碼如下：

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

{

    [_tfPassword resignFirstResponder];

    [_tfUsername resignFirstResponder];

}

 以上兩種方法是初學iOS的時候使用的。 3. 最好還是使用NotificationCenter的方法比較好，能擷取鍵盤高度等詳細資料 

#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UITextField *tfTest;@property (weak, nonatomic) IBOutlet UITextField *tfTest2;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad]; }- (void)viewDidappear:(BOOL)animated{    [super viewDidDisappear:animated];    //移除鍵盤監聽訊息    [[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillShowNotificationobject:nil];    [[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillHideNotificationobject:nil];    //註冊鍵盤監聽訊息         [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyShow:)name:UIKeyboardWillShowNotification object:nil];    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyHide:)name:UIKeyboardWillHideNotification object:nil];} //彈出鍵盤訊息響應- (void)keyShow:(NSNotification *)no{    NSLog(@"keyShow");    NSDictionary *dic = [no valueForKey:@"userInfo"];    CGFloat heightKeyboard = [[dicvalueForKey:@"UIKeyboardBoundsUserInfoKey"]CGRectValue].size.height;    UIView *firstResponderView = [self getFirstResponderView];    CGFloat distanceToBottom = self.view.frame.size.height -CGRectGetMaxY(firstResponderView.frame);    //動畫    if(distanceToBottom < heightKeyboard){        CGRect frame = self.view.frame;        frame.origin.y = -(heightKeyboard - distanceToBottom);        [UIView animateWithDuration:0.3f animations:^{            [self.view setFrame:frame];        } completion:^(BOOL finished) {        }];    }}//關閉鍵盤訊息響應- (void)keyHide:(NSNotification *)no{    NSLog(@"keyHide");    CGRect frame = self.view.frame;    frame.origin.y = 0;    //動畫    [UIView animateWithDuration:0.3f animations:^{        [self.view setFrame:frame];    } completion:^(BOOL finished) {    }];}//點擊背景地區自動隱藏鍵盤- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    UIView *firstResponderView = [self getFirstResponderView];    [firstResponderView resignFirstResponder];}//擷取當前焦點所在的控制項- (UIView *)getFirstResponderView{    UIWindow *keyWindow = [[UIApplication sharedApplication]keyWindow];    UIView *firstResponder = [keyWindow performSelector:@selector(firstResponder)];    return firstResponder;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];}@end 

　　

 

iOS對鍵盤的處理