UIViewController动画停止工作 [英] UIViewController animations stop working

问题描述

我的应用程序在iOS6中运行良好，但是在未指定的即将推出的iOS版本中，由于NDA原因我无法命名，所有 UIViewController 过渡动画都停止工作。新视图立即就位。我不确定这个未指定的iOS未来版本是否是原因，因为我在iOS6中偶尔会看到这种情况。

My app runs fine in iOS6, but in an unspecified upcoming version of iOS that I cannot name for NDA reasons, all UIViewController transition animations stop working. New views just pop into place instantly. I am not sure if this unspecified future version of iOS is the cause, as I've seen this happen occasionally in iOS6.

有时动画开始工作一段时间然后不久后停止，让我觉得这是某种内存警告问题，但我的应用程序在大多数情况下使用相当合理的~125MB RAM。任何人都可以提供任何建议或事情来调查吗？

Sometimes animations start working for a while and then stop shortly after, making me think it's some sort of memory warning issue, but my app is using a fairly reasonable ~125MB of RAM at most times. Can anyone offer any advice or things to investigate?

推荐答案

所描述的行为一直存在：如果你在背景线程上工作，然后调用和UIKit方法，然后通常会以一种奇怪的方式延迟更新。

The described behavior has always existed: if you do work on background threads and then call and UIKit methods then more often than not the update will be delayed in a weird way.

因此你应该总是 dispatch_async 进入主队列以更新UI。

Because of this you should always dispatch_async onto the main queue to update the UI.

这些错误很难捕获，因为它们并不总是可预测地发生。

Those bugs are very hard to catch since they do not always occur predictably.

为了捕获它们，我构建了一个方法，它调用一些UIKit方法来检查它们是否在主线程上被调用。这样，只要忘记发送回主队列，就可以停止符号断点。

To catch them I built a method that swizzles some UIKit methods to check if they are called on the main thread. This allows you to stop on a symbolic breakpoint, whenever you have forgotten to dispatch back onto main queue.

https://github.com/Cocoanetics/DTFoundation/blob/develop/Core/Source/iOS/Debug/UIView%2BDTDebug。 m

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