监听键盘弹出 隐藏

- (void)viewDidLoad {
    [super viewDidLoad];

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

//隐藏键盘

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.view endEditing:YES];
}

- (void)keyboardWillShow:(NSNotification *)notification {
    
    //改变window的背景颜色
    self.view.window.backgroundColor = self.view.backgroundColor;
    
    //  键盘退出的frame
    CGRect frame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    
    //键盘实时y
    CGFloat keyY = frame.origin.y;
    

    if (_nextBtny <= keyY-LTloginInset ) {
        
        return;
    }
    
    CGFloat screenh = keyY-_nextBtny-LTloginInset;
    
    //动画时间
    CGFloat keyDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
    
        //执行动画
    [UIView animateWithDuration:keyDuration animations:^{
        self.view.transform = CGAffineTransformMakeTranslation(0,screenh );
    }];
}


- (void)keyboardWillHide:(NSNotification *)notification {
    
    //动画时间
    CGFloat keyDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
    
    //执行动画
    [UIView animateWithDuration:keyDuration animations:^{
        self.view.transform = CGAffineTransformMakeTranslation(0,0);
    }];

}

- (void)dealloc
{
    
    [[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:nil];
    
}