iOS中的dispatch_async和阻止 [英] dispatch_async and block in iOS

问题描述

这段代码是什么意思？

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        TMBaseParser *parser=[[TMBaseParser alloc] init];
        parser.delegate=self;
        NSString *post =nil;
        NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding];
        [parser parseForServiceType:TMServiceCategories postdata:postData];
    });

请简要解释一下。谢谢

推荐答案

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

});

在后台线程上异步运行。这样做是因为解析数据可能是一项耗时的任务，它可能会阻止主线程停止所有动画并且应用程序无法响应。

is run asynchronously on a background thread. This is done because parsing data may be a time consuming task and it could block the main thread which would stop all animations and the application wouldn't be responsive.

如果你想要了解更多信息，请阅读有关 Grand Central Dispatch

If you want to find out more, read Apple's documentation on Grand Central Dispatch

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