從UINavigationController中解除具有自定義轉換的UIViewController時出現黑屏

Question

我有一個視圖控制器FromViewController ，我希望它提供一個自定義轉換的ToViewController 。 我已經為to-和from-transitions實現了UIViewControllerAnimatedTransitioning ，當我出現並解除ToViewController時，它們ToViewController 。

但是，如果我的FromViewController包含在UINavigationController當我解除ToViewController時，我只會得到一個黑屏。

解雇時，這是來自UIViewControllerAnimatedTransitioning的代碼：

- (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
}

我已經檢查了應用程序，似乎在解雇后UINavigationController和FromViewController都不在視圖層次結構中。

Answer 1

我想到了。 問題是當我將視圖添加到轉換上下文容器視圖時：

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

而我需要從導航控制器添加視圖：

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