应用程序在iPhone 5c的主线程上冻结，但在iPhone 6s上不冻结 [英] App freezes on main thread on iPhone 5c but not on iPhone 6s

问题描述

我正在使用带有导航控制器的应用程序. Swift +目标C

I'm working on an app with a navigation controller. Swift + objective C

重要说明: 在iPhone 5c上进行测试时，这种冻结会100％发生，而在iPhone 6s上进行测试时则不会发生

Important note: This freeze happens 100% when testing on iPhone 5c and never happens when testing on iPhone 6s

场景是:

1. 转到TableViewController A
2. 触摸列表中的一项，以到达TableViewController B
3. 按左上方的箭头返回TVController A
4. 该应用显示了TableViewController A，但立即冻结了

UI被冻结，但应用程序仍在运行. 如果按暂停"按钮(调试模式)，则可以看到线程1(主线程)堆栈为:

The UI is frozen but the app is still running. If I press the Pause button (debug mode), I can see that the Thread 1 (Main thread) stack is:

0 semaphore_wait_trap
45 UIApplicationMain
46 main
47 start

我不知道从哪里开始调查，以便找出问题所在.

I don't know where to start investigating so that I can find where the problem is.

有什么想法吗?

推荐答案

经过一天的研究， 我终于发现它已链接到MKMapView deinit.

After a day looking into it, I finally found out that it was linked to MKMapView deinit.

后来，我发现这篇帖子涉及一个非常相似的主题:

Later I found this post about a very similar topic:

警告:顶点输出片段着色器无法读取着色器"v_gradient"

根据-神-@mojuba，他发现冻结也与deinit阶段有关，因此提供了DEBUG模式的修复程序.因为这个问题似乎只发生在DEBUG ...

According to - the god - @mojuba , who found that the freeze was also related to the deinit phase offered a fix for the DEBUG mode. Because this issue seems to happen only in DEBUG...

我成功将他的修复程序应用于代码，如下所示:

I successfully applied his fix to my code as followed:

deinit {
    #if DEBUG
      // Xcode8/iOS10 MKMapView bug workaround
      if let mV = locationPickerView.mapView {
        VControllerB.unusedObjects.append(mV) // addObject:_mapView];
      }
    #endif
  }

请注意，这会导致内存泄漏，因为mapView永远不会被释放并保存在VControllerB类的静态数组中.

NOTE that this produces a memory leak as mapView is never freed and kept within a static array of the VControllerB class.

注2:1月27日，我在使用Xcode 8.2.1时报告了Apple Bug Reporter中的错误.

NOTE 2: I reported the bug in Apple Bug Reporter while using Xcode 8.2.1 in Jan 27.

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