iOS获取系统键盘高度和动画时间

最新推荐文章于 2024-08-01 04:35:22 发布

原创最新推荐文章于 2024-08-01 04:35:22 发布 · 1.2k 阅读

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本文详细介绍了在iOS开发中如何使用NSNotificationCenter来监听键盘显示和隐藏的通知，通过注册UIKeyboardWillShowNotification和UIKeyboardWillHideNotification，实现对键盘弹出时间和动画时长的获取，从而在应用程序中做出相应的界面调整。

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//添加通知
-(void)addKeyBoardShowAndHideNotification
{
    //注册键盘出现的通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification object:nil];
    //注册键盘消失的通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

//键盘显示回调方法
- (void)keyboardWillShow:(NSNotification *)notification {
    //获取系统键盘rect
    NSDictionary* userInfo = [notification userInfo];
    NSValue* keyboardFrameValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [keyboardFrameValue CGRectValue];
    //获得系统键盘弹出时间
    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

}

//键盘隐藏回调方法
- (void)keyboardWillHide:(NSNotification *)notification {
    //获得系统键盘弹出时间
    NSDictionary* userInfo = [notification userInfo];
    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];
    
}