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由于某种原因,我有一个dispatch_async线程,它崩溃,除非我有一个NSLog()方法在它前面执行.该块运行一个从数据库中检索用户名的方法.

崩溃:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
    user_web_communicator *usrWeb = [[user_web_communicator alloc]init];
    NSString *author = [usrWeb getUsernameFromID:author_string];
    [_author_label setText:[NSString stringWithFormat:@"Author: %@",author]];
});

工作:

NSLog(@"Fetching author for id: %@",author_string);
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
    user_web_communicator *usrWeb = [[user_web_communicator alloc]init];
    NSString *author = [usrWeb getUsernameFromID:author_string];
    [_author_label setText:[NSString stringWithFormat:@"Author: %@",author]];
});

错误

2013-08-19 13:56:06.149 Poll Me[4995:c07] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '{

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