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我在后台队列中调用一个方法,

dispatch_async(backgroundQueue, ^(void) {
[self loadImage:imageUrlString];
});
 // This is the loadImage method:

- (void)loadImage:(NSString *)imageUrlString
{        
    // calling a method in main queue to add a preloader

    dispatch_async(dispatch_get_main_queue(), ^(void) {


                  [self addPreloader];
    });

    // converting the url content to NSData
    NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrlString]];

    // calling a method in main queue to load the image with imageData.
    dispatch_async(dispatch_get_main_queue(), ^(void) {
        [self setImage:imageData];
    });  
}

但是应用程序崩溃了。这是我的崩溃日志: bool _WebTryThreadLock(bool), 0xc9a5010: 试图从主线程或网络线程以外的线程获取网络锁。这可能是从辅助线程调用 UIKit 的结果。现在崩溃...

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