presentViewController 在 IOS 8 中闪烁

Question

在 iOS 7 中，我们做了一个自定义动画过渡到一个新的视图控制器，动画的完成是：

[self.animatedView removeFromSuperview]; //superview == self.view, in this case
[self presentViewController:newController animated:NO completion:nil];

这在

Answer 1

真的建议您在 iOS 7 及更高版本中采用 UIViewControllerAnimatedTransitioning 协议。它易于使用，并且针对任何过渡类型和长度进行了令人难以置信的优化。无论如何，请继续使用您自己的 ios 6 及更低版本的动画，但如果您采用 ios 7 及更高版本的新协议，您的动画将得到突飞猛进的改进。

查看UIViewControllerAnimatedTransitioning上的文档

Answer 2

我有同样的问题，我的解决方法是获得这两个类。

http://www.brightec.co.uk/blog/ios-7-custom-view-controller-transitions-and-rotation-making-it-all-work

只需将它们导入项目并设置转换委托即可：

BTSlideInteractor *interactor = [[BTSlideInteractor alloc] init];
interactor.presenting = YES;

UIStoryboard *storyboard = self.storyboard;
ViewController *svc = [storyboard instantiateViewControllerWithIdentifier:@"home"];
svc.modalPresentationStyle = UIModalPresentationCustom;
svc.transitioningDelegate = interactor;
[self presentViewController:svc animated:YES completion:nil];

您可以从委托类自定义转换。问候

Answer 3

我仍然在 iOS 9 上遇到这种情况。正如其他人所提到的，避免它的唯一方法似乎是创建一个实现 UIViewControllerAnimatedTransitioning 的对象。希望我可以节省其他人浏览这个文档记录不佳的 API 的时间。以下是您需要做的：

1. 在要呈现的 VC 中设置 self.modalPresentationStyle = UIModalPresentationCustom;。

2. 在呈现的 VC 中，实现 UIViewControllerTransitioningDelegate 并执行以下操作：

   UIViewController* myVC = [[UIViewController alloc] init];
   myVC.transitioningDelegate = self;
   [self presentViewController:myVC animated:YES completion:nil];
   

3. 在呈现的 VC 中返回您的自定义动画对象。

   - (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
       return [[MXQuickFadeTransition alloc] init];
   }
   
   - (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
       MXQuickFadeTransition* transition = [[MXQuickFadeTransition alloc] init];
       transition.duration = 0.3f;
       return transition;
   }
   

4. 像这样实现转换：

   @implementation MXQuickFadeTransition
   
   - (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext {
       return self.duration > 0 ? self.duration : 0.01f;
   }
   
   - (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext {
       UIViewController *fromController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
       UIViewController *toController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
       UIView *containerView = transitionContext.containerView;
   
       const BOOL isPresenting = [toController presentedViewController] != fromController;
   
       if (isPresenting) {
           [containerView addSubview:toController.view];
           [containerView bringSubviewToFront:toController.view];
       }
   
       fromController.view.alpha = 1.0f;
       toController.view.alpha = 0.0f;
       [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
           fromController.view.alpha = 0.0f;
           toController.view.alpha = 1.0f;
       } completion:^(BOOL finished) {
           [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
       }];
   }
   
   @end
   

有用的参考资料：

• UIViewController – issue with custom dismiss transition
• https://www.raywenderlich.com/113845/ios-animation-tutorial-custom-view-controller-presentation-transitions