解除视图控制器时出错 [英] Error when dismissing view controller

问题描述

在解雇视图控制器时出现错误，之前没有看到类似的内容，而且在互联网上没有太多关于它。

Getting an error when dismissing a view controller, not seen anything like it before, and not much about it on the internet.

继承人错误：
* 断言失败 - [UIKeyboardTaskQueue waitUntilAllTask​​sAreFinished]，/ SourceCache / UIKit / UIKit-2903.2 / Keyey / UIKeyboardTaskQueue.m：368

heres the error: * Assertion failure in -[UIKeyboardTaskQueue waitUntilAllTasksAreFinished], /SourceCache/UIKit/UIKit-2903.2/Keyboard/UIKeyboardTaskQueue.m:368

a一点背景，我保存一些数据后解除视图控制器。数据每次都成功保存。此外，我最近更改了日期保存代码以在这个方法的主线程上运行，因为我在后台保存了一些问题。

a bit of background, i dismiss the view controller after saving some data. the data saves successfully, every time. also, i recently changed the date saving code to run on the main thread for this one method, as i was having some issues saving in the background.

任何想法为什么这个正在发生什么？

any ideas why this is happening?

提前致谢。

推荐答案

我收到了这个在我不是主线程（来自网络请求中的回调）的线程上调用 -presentViewController：animated：completion：时出错。解决方案是将您的调用调用present和dismiss视图控制器发送到主线程：

I recieved this error when I was calling -presentViewController:animated:completion: on a thread that was not the main thread (from a callback in a network request). The solution is to dispatch your calls to present and dismiss view controllers to the main thread:

dispatch_async(dispatch_get_main_queue(), ^{
    //Code that presents or dismisses a view controller here
});

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