Question

对于常量UIKeyboardFrameEndUserInfoKey，在Apple文档中说：

这些坐标不考虑任何旋转因子作为界面方向的结果应用于窗口的内容变化。因此，您可能需要将矩形转换为窗口坐标（使用convertRect：fromWindow：方法）或查看在使用之前坐标（使用convertRect：fromView：方法）。

所以，如果我使用[view1 convertRect:rect fromView:view2]

我会为上述参数插入什么来让它正确转换旋转值？即：

view1 =？ rect =？（我假设的键盘架） view2 =？

尝试了一些事情并获得了一些有趣的东西。

Answer 1

第一个视图应该是您的视图。第二个视图应为零，表示窗口/屏幕坐标。因此：

NSDictionary* d = [notification userInfo];
CGRect r = [d[UIKeyboardFrameEndUserInfoKey] CGRectValue];
r = [myView convertRect:r fromView:nil];

现在，根据您的视图，键盘将占用矩形。如果您的视图是当前视图控制器的视图（或其子视图），则现在考虑旋转等。

Answer 2

我尝试了接受的答案，发现它实际上并没有在视图中提供键盘的CGRect。我发现我必须将CGRect从UIScreen对象转换为UIWindow对象，并从UIWindow对象转换为UIView对象：

NSValue * keyboardEndFrame;
CGRect    screenRect;
CGRect    windowRect;
CGRect    viewRect;

// determine's keyboard height
screenRect    = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
windowRect    = [self.view.window convertRect:screenRect fromWindow:nil];
viewRect      = [self.view        convertRect:windowRect fromView:nil];

我使用上面的内容来调整根视图的大小，使其不被键盘隐藏：

NSTimeInterval  duration;
CGRect          frame;

// determine length of animation
duration  = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

// resize the view
frame              = self.view.frame;
frame.size.height -= viewRect.size.height;

// animate view resize with the keyboard movement
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:duration];
self.view.frame = frame;
[UIView commitAnimations];

Answer 3

+ (void)parseKeyboardNotification:(NSNotification *)notification
                 inRelationToView:(UIView *)view
                             info:(void(^)(NSTimeInterval keyboardAnimationDuration, CGRect keyboardFrameInView, UIViewAnimationOptions keyboardAnimationOptions))callback
{
    NSParameterAssert(notification != nil);
    NSParameterAssert(view != nil);

    NSDictionary *userInfo = [notification userInfo];

    UIViewAnimationCurve animationCurve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
    UIViewAnimationOptions animationOption = animationCurve << 16; // https://devforums.apple.com/message/878410#878410
    NSTimeInterval animationDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    // http://stackoverflow.com/a/16615391/202451
    CGRect screenRect    = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGRect windowRect    = [view.window convertRect:screenRect fromWindow:nil];
    CGRect viewRect      = [view        convertRect:windowRect fromView:nil];

    callback(animationDuration, viewRect, animationOption);
}

可以像这样使用

- (void)keyboardWillShowOrHide:(NSNotification *)notification
{    
    [AGKeyboardInfo parseKeyboardNotification:notification inRelationToView:self.view info:^(NSTimeInterval keyboardAnimationDuration, CGRect keyboardFrameInView, UIViewAnimationOptions keyboardAnimationOptions) {

        [UIView animateWithDuration:keyboardAnimationDuration delay:0 options:keyboardAnimationOptions animations:^{

             // do any modifications to your views

        } completion:nil];
    }];
}

将UIKeyboardFrameEndUserInfoKey转换为视图或窗口坐标

3 个答案: