iOS——UIKeyboardWillShowNotification 监听键盘高度变化

- (void)viewDidLoad {

    [super viewDidLoad];

    UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 100, 50)];

    textField.backgroundColor = [UIColor blueColor];

    [self.view addSubview:textField];

//出现键盘

    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

 //键盘隐藏

 [[NSNotificationCenter defaultCenter] addObserver:self 

                                           selector:@selector(keyboardWillHidden:) 

                                               name:UIKeyboardWillHideNotification 

                                             object:self.view.window];

    };

 

-(void)keyboardWillShow:(NSNotification*)notification{

    NSDictionary*info=[notification userInfo];

    CGSize kbSize=[[info objectForKey:UIKeyboardFrameEndUserInfoKey]CGRectValue].size;

    NSLog(@"keyboard changed, keyboard width = %f, height = %f",

          kbSize.width,kbSize.height);

    //在这里调整UI位置

}

  //键盘将要消失

-(void)keyboardWillHidden:(NSNotification*)notification

{

 

 NSDictionary*info=[notification userInfo];

    CGSize kbSize=[[info objectForKey:UIKeyboardFrameEndUserInfoKey]CGRectValue].size;

    NSLog(@"keyboard changed, keyboard width = %f, height = %f",

          kbSize.width,kbSize.height);

}