问题描述
GTLServiceYouTube executeQuery 当我在后台线程中执行它时未调用回调。视频不会上传。当我在主线程中执行它时它工作正常。我得到回调和视频也上传。我可以通过强制 executeQuery 在主线程中运行来解决这个问题，但这会影响UI性能。我该如何解决这个问题？
GTLServiceYouTube executeQuery callback not called when I execute it in background thread.Video wont get uploaded. It works fine when I execute it in main thread.I get callbacks and video is also uploaded. I can solve this by forcing executeQuery to run in main thread but that affects the UI performance. How can I solve this issue?
我的代码是这样的，
self.uploadFileTicket = [service executeQuery:query
completionHandler:^(GTLServiceTicket *ticket,
GTLYouTubeVideo *uploadedVideo,
NSError *error) {
// code to handle
}
推荐答案
我找到了解决方案！这里发生的事情是，当我在后台线程中运行代码时，在回调到来之前线程被分离。因此我们没有得到回调。当我在主线程中运行它时，主线程始终保持活动状态。因此我们得到了回调。因此，可以通过使用以下代码使当前线程等待来解决此问题。
I found a solution! Here whats happening is, when I run the code in background thread, before the callback comes the thread is detached. Hence we don't get the callback. When I run it in main thread, main Thread remains alive throughout. Hence we do get callback. Hence this problem can be solved by making current thread to wait using following code.
[[NSRunLoop currentRunLoop] runUntilDate:stopDate];
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