带有 dismissViewControllerAnimated 的 iOS 8 错误 : completion: animation?

Question

dismissViewControllerAnimated:completion: 的 iOS 文档指出:

If you present several view controllers in succession, thus building a stack of presented view controllers, calling this method on a view controller lower in the stack dismisses its immediate child view controller and all view controllers above that child on the stack. When this happens, only the top-most view is dismissed in an animated fashion; any intermediate view controllers are simply removed from the stack. The top-most view is dismissed using its modal transition style, which may differ from the styles used by other view controllers lower in the stack.

这意味着当使用一次关闭两个模态视图 Controller 时

[[[self presentingViewController] presentingViewController] dismissViewControllerAnimated:YES completion:nil];

显示的动画应该是被关闭的顶部模态视图。

在 iOS 7 和之前的版本中确实如此，但在 iOS 8 中显示的动画不是最顶层 View (根据我的经验，它是第二个最顶层 View )。这种行为是 iOS 8 中的错误还是我做错了什么？

Answer 1

如上评论:我在 unwind segue 上下文中看到了完全相同的问题。我只是使用屏幕截图按照此处所述的解决方法，并将其作为 subview 添加到所有中间 viewControllers:How to dismiss a stack of modal view controllers with animation without flashing on screen any of the presented VCs between the top and bottom?

    // this in during unwind in a custom UIStoryboardSegue (that is the reason why it might look wrong with what is what: srcViewController and destViewController
    UIViewController* aPresentedViewController = destViewController.presentedViewController;
    while (aPresentedViewController != nil) {
        if (aPresentedViewController == srcViewController) {
            break;
        }
        UIView *anotherSrcViewCopy = [srcViewController.view snapshotViewAfterScreenUpdates: NO];
        anotherSrcViewCopy.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
        [aPresentedViewController.view addSubview:anotherSrcViewCopy];
        // recurse through the presentedViewController hierarchy
        aPresentedViewController = aPresentedViewController.presentedViewController;
    }