ios - 使用 dispatch 卡住屏幕

Question

我使用此代码，它卡住了屏幕。为什么会这样？

__block double delayInSeconds = 1.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){

    if ([self loginTypeIsUser])
    {
        [self getVideoPlayLinksForEntity:wallpostEntity];
    }
}); 

Answer 1

发生这种情况是因为您锁定了主线程。您不应该 dispatch_get_main_queue() 而应在后台执行此操作。

尝试:

dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0)

或

dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)