在iOS7 GM上不调用完成处理程序 [英] Completion handler is not called on iOS7 GM

问题描述

我正在使用AVAssetWriter，它完全适用于iOS6。

I'm using AVAssetWriter, and it is perfectly working on iOS6.

问题是，当我调用 finishWritingWithCompletionHandler ，iOS7 GM上没有调用完成处理程序。

The problem is, when I called finishWritingWithCompletionHandler, the completion handler is not called on iOS7 GM.

在我之前，我打电话给 markAsFinished ，甚至 endSessionAtSourceTime 调用finishWritingWithCompletionHandler。

I called markAsFinished, and even endSessionAtSourceTime before I call finishWritingWithCompletionHandler.

在iOS6上运行正常。

It works fine on iOS6.

甚至更多，在iOS7上，它可以工作一段时间，然后它再也不起作用了。

And even more, on iOS7, it works some times, and then it doesn't work again.

我不知道为什么，但如果我使用警报视图调用该方法，它就有效。
所以我尝试了 performSelectorOnMainThread 和 inBackground ，但它没有帮助。

I don't know why, but it works if I call the method using alert view. So I tried performSelectorOnMainThread and inBackground, but it didn't help.

任何想法？

推荐答案

显然你现在需要保留assetWriter。

Apparently you need to retain the assetWriter now.

您可以尝试保留一个强大的属性，看看您的完成处理程序是否被调用。 （务必在完成处理程序中将该属性设置为n。）

You might try retaining with a strong property it and see if your completion handler gets called. (Be sure to nil that property in completion handler.)

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