从 UINavigationController 中通过自定义转换关闭 UIViewController 时出现黑屏

Posted 2023-03-13

【中文标题】从 UINavigationController 中通过自定义转换关闭 UIViewController 时出现黑屏

【英文标题】：Black screen when dismissing a UIViewController with custom transition from within a UINavigationController

【发布时间】：2017-12-25 12:41:17

【问题描述】：

我有一个视图控制器FromViewController，我希望它呈现一个带有自定义转换的ToViewController。我已经为 to 和 from 转换实现了 UIViewControllerAnimatedTransitioning，当我展示和关闭 ToViewController 时，这一切都很好。

但是，如果我的 FromViewController 包含在 UINavigationController 中，我在关闭 ToViewController 时会出现黑屏。

这是来自UIViewControllerAnimatedTransitioning 关闭时的代码：

- (void)animateTransition:(nonnull id<UIViewControllerContextTransitioning>)transitionContext 
    self.toViewController = (ToViewController *)
    [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UINavigationController *navigationController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    self.fromViewController = (FromViewController *)navigationController.topViewController;
    self.containerView = transitionContext.containerView;

    [self.containerView insertSubview:self.fromViewController.view belowSubview:self.toViewController.view];

    // My animations go here

    // In the animation completion block I call:
    [transitionContext completeTransition:!transitionContext.transitionWasCancelled];  // this is when my screen goes black

我检查了应用程序，似乎 UINavigationController 和 FromViewController 在解雇后不在视图层次结构中。

【参考方案1】：

我想通了。问题是当我将视图添加到转换上下文容器视图时：

 [self.containerView insertSubview:self.fromViewController.view belowSubview:self.toViewController.view];

我需要从导航控制器添加视图：

[self.containerView insertSubview:navigationController.view belowSubview:self.toViewController.view];