iOS5键盘弹出view自适应

最新推荐文章于 2021-05-26 08:28:30 发布

iteye_9729

最新推荐文章于 2021-05-26 08:28:30 发布

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分类专栏： iphone

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本文介绍如何使用iOS的通知中心来监听键盘显示和隐藏的事件，并通过这些事件调整UI布局，确保当键盘弹出时，应用程序的界面能够平滑地进行调整。

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

#ifdef __IPHONE_5_0
    float version = [[[UIDevice currentDevice] systemVersion] floatValue];
    if (version >= 5.0) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];
    }
#endif


#pragma -
#pragma keyboard notification
- (void)keyboardWillShow:(NSNotification*)notification {
    NSDictionary *userInfo = [notification userInfo];

    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGRect keyboardRect = [aValue CGRectValue];

    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];

    ... do something ...

    [UIView commitAnimations];
}

- (void)keyboardWillHide:(NSNotification*)notification {
    NSDictionary *userInfo = [notification userInfo];

    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

    CGRect keyboardRect = [aValue CGRectValue];

    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:animationDuration];

    ... do something ...

    [UIView commitAnimations];
}

改变键盘大小时也会更新视图