iOS状态恢复动画bug [英] iOS state restoration animation bug

问题描述

我只想在我的某个应用中实现iOS State-Restoration API。
最后让它工作后，我发现我以模态方式呈现的ViewController使用动画恢复，这不是我想要的。我希望我的应用程序只处于我离开它的状态，但没有让用户看到他到那里的热点。

I just wanted to implement the iOS State-Restoration APIs in one of my Apps. After finally getting it to work, I discovered that a ViewController that I present modally gets restored using an animation, which is not what I want. I would expect my app to just be in the state I left it, but not having the user to see hot he got there.

所以我继续下载Apple Sample代码： https://developer.apple.com/library /ios/samplecode/StateRestore/Introduction/Intro.html 并想知道它是否也在那里发生。事实证明它确实如此。

So I went ahead and downloaded Apple Sample Code on that: https://developer.apple.com/library/ios/samplecode/StateRestore/Introduction/Intro.html and wanted to see if it happens there as well. And it turns out that it does.

此外，日志中还有一个警告：

Further there is a warning in the Logs:

Unbalanced calls to begin/end appearance transitions for <UINavigationController: 0x7b0512b0>.

你能否告诉我，我是否明显苹果样本代码做错了什么，或者它是否是一个bug在iOS？

Can you tell me if I and obviously Apples Sample Code are doing something wrong, or if it's a bug in iOS?

Btw。我在iOS8上测试

Btw. I was testing on iOS8

感谢您的帮助，
Georg

Thanks for any help, Georg

推荐答案

以下解决方案直接来自Apple。

The following solution comes directly from Apple.

在你的app delegate中，你应该实现应用程序：willFinishLaunchingWithOptions：（代替 didFinishLaunching 除此之外）。在您的实现中，可能是在返回 true 之前的最后一行（如果这是Objective-C，则为YES），插入以下行：

In your app delegate, you should be implementing application:willFinishLaunchingWithOptions: (instead of or in addition to didFinishLaunching). In your implementation, probably as the last line just before returning true (or YES if this is Objective-C), insert this line:

self.window?.makeKeyAndVisible()

或者，如果这是Objective-C：

Or, if this is Objective-C:

[self.window makeKeyAndVisible];

事实证明这是始终需要，但文档从未很清楚。

It turns out that this was always needed, but the documentation has never been clear about it.

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