键盘“WillShow”和“WillHide”vs.旋转。-Keyboard“WillShow”and“WillHide”vs.Rotation

54  

Maybe a bit late, but I've just run into the same issue and have a nice solution for it that avoids any kind of work arounds (unless of course apple change things)

可能有点晚了，但是我遇到了同样的问题，我有一个很好的解决方案，避免了任何形式的工作(当然，除非苹果改变了事情)

Basically, when the notification center calls your method for UIKeyboardWillShowNotification (or any of the other notifications), the frame that it gives you for UIKeyboardFrameBeginUserInfoKey is in context of the window, NOT your view. The problem with this, is that the windows coordinate system is always in portrait, regardless of the devices orientation, hence you're finding the width and height the wrong way round.

基本上，当通知中心为UIKeyboardWillShowNotification(或其他通知)调用你的方法时，它为UIKeyboardFrameBeginUserInfoKey提供的框架是在窗口的上下文中，而不是你的视图。这样做的问题是，无论设备的方向如何，windows坐标系统始终是纵向的，因此您会发现宽度和高度是错误的。

If you want to avoid your work around, simply convert the rectangle into the coordinate system of your view (which does change according to the orientation). To do this, do something like the following :

如果你想避免你的工作，只需把矩形转换成你视图的坐标系统(它会根据方向变化)。要做到这一点，可以做以下事情:

- (void) keyboardWillShow:(NSNotification *)aNotification
{
     CGRect keyboardFrame = [[[aNotification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    CGRect cOnvertedFrame= [self.view convertRect:keyboardFrame fromView:self.view.window];

    ......
    /* Do whatever you want now with the new frame.
     * The width and height will actually be correct now
     */
    ......
}

Hopefully this should be what you're after :)

希望这就是你想要的

4  

Recently I've wrote a blog post about this exact problem you've described and how to solve it with a short and elegant way. Here is the link to the post: Synchronizing rotation animation between the keyboard and the attached view

最近，我写了一篇博文，介绍了你所描述的这个问题，以及如何用一种简洁优雅的方式来解决它。这里是post的链接:在键盘和附加视图之间同步旋转动画

If you don't want to dive into the long explanation described in the blog post here is a short description with a code example:

如果您不想深入了解博客文章中所描述的冗长的解释，这里有一个简短的描述和代码示例:

The basic principle is to use the same method that everyone uses - observing keyboard notifications to animate the attached view up and down. But in addition to that, you have to cancel these animations when the keyboard notifications are fired as a consequence of interface orientation change.

基本原则是使用每个人都使用的相同方法——观察键盘通知，使附加的视图上下浮动。但除此之外，你还必须取消这些动画，当键盘通知被触发，作为接口方向改变的结果。

Rotation example without animation cancellation custom on interface orientation change:

旋转例子，没有动画取消自定义界面方向改变:

Rotation example with animation cancellation on interface orientation change:

旋转例子与动画取消界面方向的改变:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

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

- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];

    [[NSNotificationCenter defaultCenter]
            removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter]
            removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
    self.animatingRotation = YES;
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
    [super didRotateFromInterfaceOrientation:fromInterfaceOrientation];
    self.animatingRotation = NO;
}

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

    // Get the end frame of the keyboard in screen coordinates.
    CGRect finalKeyboardFrame = [[notificationInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

    // Convert the finalKeyboardFrame to view coordinates to take into account any rotation
    // factors applied to the window’s contents as a result of interface orientation changes.
    finalKeyboardFrame = [self.view convertRect:finalKeyboardFrame fromView:self.view.window];

    // Calculate new position of the commentBar
    CGRect commentBarFrame = self.commentBar.frame;
    commentBarFrame.origin.y = finalKeyboardFrame.origin.y - commentBarFrame.size.height;

    // Update tableView height.
    CGRect tableViewFrame = self.tableView.frame;
    tableViewFrame.size.height = commentBarFrame.origin.y;

    if (!self.animatingRotation) {
        // Get the animation curve and duration
        UIViewAnimationCurve animatiOnCurve= (UIViewAnimationCurve) [[notificationInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
        NSTimeInterval animatiOnDuration= [[notificationInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

        // Animate view size synchronously with the appearance of the keyboard. 
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:animationDuration];
        [UIView setAnimationCurve:animationCurve];
        [UIView setAnimationBeginsFromCurrentState:YES];

        self.commentBar.frame = commentBarFrame;
        self.tableView.frame = tableViewFrame;

        [UIView commitAnimations];
    } else {
        self.commentBar.frame = commentBarFrame;
        self.tableView.frame = tableViewFrame;
    }
}

This answer was also posted in similar question: UIView atop the Keyboard similar to iMessage App

这个答案也有类似的问题:在键盘上的UIView类似iMessage应用。

3  

I met the same problem. iOS gaves me incorrect width/height of the keyboard. I used the following snipped in a keyboardDidShow handler:

我遇到了同样的问题。iOS使我的键盘宽度/高度不正确。我在keyboardDidShow处理器中使用了如下剪切:

CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
CGSize keyboardSize2 = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
LogDbg(@"keyboard size: frameBegin=%@; frameEnd=%@", NSStringFromCGSize(keyboardSize), NSStringFromCGSize(keyboardSize2));

and for portrait and landscape modes of iPad I got respectively:

iPad的人像模式和景观模式分别是:

2012-06-14 04:09:49.734 -[LoginViewController keyboardDidShow:] 132 [DBG]:keyboard size: frameBegin={768, 264}; frameEnd={768, 264}
2012-06-14 04:10:07.971 -[LoginViewController keyboardDidShow:] 132 [DBG]:keyboard size: frameBegin={352, 1024}; frameEnd={352, 1024}

Guessing that the width of the keyboard should be greater then the height (yep, i'm so naive) I made a workaround like following:

我猜想键盘的宽度应该比高度大(是的，我太天真了)，于是我做了如下的变通:

if (keyboardSize.width