iOS7 UIModalTransitionStyleFlipHorizontal转型后反弹

Question

我正在更新iOS 7的应用程序，我发现了一个奇怪的问题。我正在展示一个用UIViewController包装在UINavigationController中的UIModalTransitionStyleFlipHorizontal。

在iOS 6中，它工作得很好，但是在iOS 7中，导航条在转换后会反弹。这和状态栏有关吗？我已经将主导航条的半透明设置为NO。

在Info.plist中，基于视图控制器的状态栏外观设置为NO。

下面是一个GIF，在一个最小的演示应用程序中显示了这个问题：

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这是我的代码：

feedNavigationController = [[UINavigationController alloc] init];
feedNavigationController.navigationBar.translucent = NO;

SettingsViewController *settingsVC = [[SettingsViewController alloc] init];

feedNavigationController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[feedNavigationController setViewControllers:[NSArray arrayWithObjects:settingsVC, nil]];

[self presentViewController:feedNavigationController animated:YES completion:nil];

Answer 1

这似乎是一个UIKit错误。下面的解决办法似乎为我解决了这个问题。

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

    [self.navigationController.navigationBar.layer removeAllAnimations];
}

(将其放在正在将转换为的视图控制器中)。

Answer 2

为了解决这个问题，我使用iOS7自定义转换。

将此添加到您的UIViewController中：

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    return (id<UIViewControllerAnimatedTransitioning>)self;
}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
    return (id<UIViewControllerAnimatedTransitioning>)self;
}

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext {
    return 0.7f;
}

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext {
    UIView *containerView = [transitionContext containerView];


    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    [containerView addSubview:fromVC.view];

    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    [containerView addSubview:toVC.view];

    UIViewAnimationOptions animationOption = ([toVC.presentedViewController isEqual:fromVC])?UIViewAnimationOptionTransitionFlipFromLeft:UIViewAnimationOptionTransitionFlipFromRight;


    [UIView transitionFromView:fromVC.view
                        toView:toVC.view
                      duration:[self transitionDuration:transitionContext]
                       options:animationOption
                    completion:^(BOOL finished) {
                        [transitionContext completeTransition:YES];
                    }];
}

要使用它，只需检查是否在iOS7上并设置transitionDelegate：

YourVCWithTheCustomTransition* yourVC = [[YourVCWithTheCustomTransition alloc] init];

CGFloat deviceVersion = [UIDevice currentDevice].systemVersion.floatValue;
if(deviceVersion >= 7.0) [yourVC setTransitioningDelegate:yourVC];

[self presentModalViewController:yourVC animated:YES];
[yourVC release];

在我的例子中，我有一个自定义UINavigationController，其中定义了自定义转换:我不必每次都这样做。

Answer 3

这似乎是一个UIKit错误。下面的解决办法似乎为我解决了这个问题。

presentViewController (将其放置在要转换到的视图控制器中)：

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

    [self.navigationController.navigationBar.layer removeAllAnimations];
}

dismissViewControllerAnimated (将其放在视图控制器中，您可以将其解说给视图控制器)：

- (void)viewWillLayoutSubviews{
    [super viewWillLayoutSubviews];

    [self.navigationController.navigationBar.layer removeAllAnimations];
}

如果你不使用autolayout。您需要将其添加到您的dismiss视图控制器中：

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

    [self.view setNeedsLayout];
}