如何避免“CoreAnimation警告已删除的线程与未提交的CATransaction”如果不使用CoreAnimation [英] How to avoid "CoreAnimation warning deleted thread with uncommitted CATransaction" if NOT using CoreAnimation

问题描述

就在appdelegates，applicationDidBecomeActive。我创建并启动一个线程，该线程等待异步下载然后保存数据：

Just in the appdelegates, applicationDidBecomeActive. I create and start a thread, this thread waits an asynchronous download and then save data:

 - (void)applicationDidBecomeActive:(UIApplication *)application
    {
              // begins Asynchronous download data (1 second):
               [wsDataComponents updatePreparedData:NO];

               NSThread* downloadThread = [[NSThread alloc] 
                  initWithTarget:self 
                        selector: @selector (waitingFirstConnection) 
                          object:nil];
               [downloadThread start];
        }

然后

-(void)waitingFirstConnection{    

    while (waitingFirstDownload) {
      // Do nothing ...  Waiting a asynchronous download, Observers tell me when
      // finish first donwload
    }

    // begins Synchronous download, and save data (20 secons)
    [wsDataComponents updatePreparedData:YES];

    // Maybe is this the problem ?? I change a label in main view controller 
    [menuViewController.labelBadgeVideo setText:@"123 videos"];

    // Nothig else, finish and this thread is destroyed
}

在Organizer控制台中，完成后，我收到此警告：

In the Organizer console, when finished, I am getting this warning:

CoreAnimation: warning, deleted thread with uncommitted CATransaction;

推荐答案

另一种确保主要UI绘制的方法正如Andrew所描述的那样，线程正在使用方法 performSelectorOnMainThread：withObject：waitUntilDone：或者 performSelectorOnMainThread：withObject：waitUntilDone：modes：

Another way of ensuring any UI drawing occurs on the main thread, as described by Andrew, is using the method performSelectorOnMainThread:withObject:waitUntilDone: or alternatively performSelectorOnMainThread:withObject:waitUntilDone:modes:

- (void) someMethod
{
    […]

    // Perform all drawing/UI updates on the main thread.
    [self performSelectorOnMainThread:@selector(myCustomDrawing:)
                           withObject:myCustomData
                        waitUntilDone:YES];

    […]
}

- (void) myCustomDrawing:(id)myCustomData
{
    // Perform any drawing/UI updates here.
}

关于 dispatch_async之间差异的相关帖子（ ）和 performSelectorOnMainThread：withObjects：waitUntilDone：参见主队列上的performSelectorOnMainThread和dispatch_async之间的区别是什么？

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