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iOS键盘高度的获取

iOS键盘高度的获取

作者: liu强 | 来源:发表于2017-06-19 11:57 被阅读0次

<pre>

  • (void)registerNotification
    {
    [super registerNotification];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardWillShowNotification:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardWillChangeFrameNotification:) name:UIKeyboardWillChangeFrameNotification object:nil];
    }

  • (void)deregisterNotification
    {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
    [super deregisterNotification];
    }

  • (void)handleKeyboardWillShowNotification:(NSNotification)noti
    {
    CGFloat tmpKeyboardVisibleHeight = 0;
    CGRect endRect = [(NSValue
    )noti.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    tmpKeyboardVisibleHeight = self.view.height - endRect.origin.y;
    if (tmpKeyboardVisibleHeight != currentKeyboardVisibleHeight)
    {
    currentKeyboardVisibleHeight = tmpKeyboardVisibleHeight;
    [self scollContentContainer:currentKeyboardVisibleHeight];
    }
    }

  • (void)handleKeyboardWillChangeFrameNotification:(NSNotification)noti
    {
    //如果currentKeyboardVisibleHeight为0则代表键盘将会被隐藏,否则则会被显示出来
    CGRect endRect = [(NSValue
    )noti.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    //不能判断beginRect和endRect是否相等,如果在不相等的时候才做�更新,程序会出现bug
    CGFloat tmpKeyboardVisibleHeight = 0;
    tmpKeyboardVisibleHeight = self.view.height - endRect.origin.y;
    if (tmpKeyboardVisibleHeight != currentKeyboardVisibleHeight)
    {
    currentKeyboardVisibleHeight = tmpKeyboardVisibleHeight;
    //如果密码框可以切换输入法,这儿可能会有潜在的bug
    [self scollContentContainer:currentKeyboardVisibleHeight];
    }
    }
    </pre>

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