利用通知监测键盘高度

 

//键盘的frame发生改变时发出的通知（位置和尺寸）




UIKeyboardWillChangeFrameNotification

 UIKeyboardDidChangeFrameNotification




 //键盘显示时发出的通知




 UIKeyboardWillShowNotification

 UIKeyboardDidShowNotification




 //键盘隐藏时发出的通知




 UIKeyboardWillHideNotification

 UIKeyboardDidHideNotification







//添加观察者 监听键盘变化

- (void)viewDidLoad {

    [super viewDidLoad];

    [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(action:)name:UIKeyboardDidChangeFrameNotificationobject:nil];

}

//监听执行方法

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

   

    NSLog(@"%@",notification.userInfo);

NSLog(@"%@",notification.userInfo[@"UIKeyboardFrameEndUserInfoKey"]);

    //键盘的frame

    CGRect rect = [notification.userInfo[@"UIKeyboardFrameEndUserInfoKey"]CGRectValue];  

}

//输出键盘动画时间

NSLog(@"%f",[notification.userInfo[@"UIKeyboardAnimationDurationUserInfoKey"]floatValue]);

//userInfo打印出来的信息

 {

    UIKeyboardAnimationCurveUserInfoKey = 7;

    UIKeyboardAnimationDurationUserInfoKey = "0.25";

    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {414, 271}}";

    UIKeyboardCenterBeginUserInfoKey = "NSPoint: {207, 871.5}";

    UIKeyboardCenterEndUserInfoKey = "NSPoint: {207, 600.5}";

    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 736}, {414, 271}}";

    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 465}, {414, 271}}";

    UIKeyboardIsLocalUserInfoKey = 1;

}

CGRect rect = [NSRect: {{0, 465}, {414, 271}} CGRectValue];转化对象