iOS成长之路-获取系统键盘的高度

最新推荐文章于 2024-06-30 15:55:53 发布

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本文介绍如何使用NSNotificationCenter在iOS应用中监听键盘显示与隐藏的通知，并获取键盘的高度信息。

NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
    //UIKeyboardWillShowNotification键盘出现
    [defaultCenter addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

    //UIKeyboardWillHideNotification 键盘隐藏
    [defaultCenter addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

- (void)keyboardWillShow:(NSNotification *)aNotification
{
    //获取键盘的高度
	NSDictionary *userInfo = [aNotification userInfo];
    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];
    int height = keyboardRect.size.width;
}