objective-c - IOS8如何移动一个事件的popover

Question

我已经为 iOS7 开发了一个应用程序，现在正尝试为 iOS8 更新它。我遇到的问题如下:

应用程序屏幕方向可以旋转，在某些情况下，一些按钮会大幅移动。我有一些指向这些按钮的弹出窗口，所以如果在屏幕旋转、按钮移动时弹出窗口打开，我也需要弹出窗口。

在 iOS7 中，我通过以下方式做到了这一点:当屏幕旋转时我更新了约束

- (void) updateViewConstraints 
{
    if (UIInterfaceOrientationIsLandscape(self.interfaceOrientation))
    {
        self.Button.constant = (CGFloat)10;
    }
    else
    {
        self.Button.constant = (CGFloat)5;
    }
    [super updateViewConstraints];
} 

我也移动了弹出框

- (void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{

    if(TempDisplayPopoverController == examplePopoverController)
    {
        [examplePopoverController presentPopoverFromRect:[self ExamplePopoverPosition] inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }
}

我最初加载弹出窗口

- (void) LoadPopover{
    examplePopover = [[examplep alloc] initWithNibName:@"exampleP" bundle:nil];
    [examplePopover setDelegate:self];
    examplePopoverController = [[UIPopoverController alloc] initWithContentViewController: examplePopover];
    [examplePopoverController setDelegate:self];

    examplePopoverController.popoverContentSize = examplePopover.view.frame.size;

    TempDisplayPopoverController = examplePopoverController;


    if ([examplePopoverController isPopoverVisible])
    {
        [examplePopoverController dismissPopoverAnimated:YES];
    }
    else
    {
        [examplePopoverController presentPopoverFromRect:[self ExamplePopoverPosition] inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }
}

[self ExamplePopoverPosition]只是返回按钮位置。

这一切都很好，我很开心，iPad 很开心，一切都很乖。

现在由于 iOS8，我必须更改一些位。

self.interfaceOrientation折旧

[examplePopoverController presentPopoverFromRect:[self ExamplePopoverPosition] inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

在didRotateFromInterfaceOrientation抛出错误

"Application tried to represent an active popover presentation: <UIPopoverPresentationController: 0x7bf59280>"

我已设法纠正 self.interfaceOrientation通过

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    [self SetUpScreen:toInterfaceOrientation];
}

- (void) SetUpScreen:(UIInterfaceOrientation)toInterfaceOrientation{
    if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft ||
        toInterfaceOrientation == UIInterfaceOrientationLandscapeRight)
    {
        self.Button.constant = (CGFloat)10;
    }
    else
    {
        self.Button.constant = (CGFloat)5;
    }
    [super updateViewConstraints];
}

但不知道如何解决弹出窗口问题。我试过了

popoverController: willRepositionPopoverToRect: inView:

但似乎无法让它发挥作用。

任何人都可以建议

谢谢

Answer 1

在 iOS 8 中你可以使用 -viewWillTransitionToSize:withTransitionCoordinator:处理屏幕尺寸(和方向)变化:

- (void)viewWillTransitionToSize:(CGSize)size
       withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator 
{
    [_popover dismissPopoverAnimated:NO];
    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
         // Update your layout for the new size, if necessary.  
         // Compare size.width and size.height to see if you're in landscape or portrait.
    } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
        [_popover presentPopoverFromRect:[self popoverFrame] 
                                  inView:self.view
                permittedArrowDirections:UIPopoverArrowDirectionAny 
                                animated:NO];
    }];
}

当您实现此方法时，像 willAnimateRotationToInterfaceOrientation: 这样的弃用旋转方法在​​ iOS 8 上运行时将不会被调用。