使用GCD的完成区块 [英] Completion block using GCD

问题描述

我正在开发一个需要完成块和障碍"功能的应用程序. 据我所知，NSOperation API具有completionBlock属性，而GCD API具有dispatch_barrier_(a)sync函数来处理障碍需求.

I am developing an app that requires a completion block and a "barrier" functionality. As far as I know, NSOperation API has a completionBlock property and GCD API has the dispatch_barrier_(a)sync function to handle the barrier needs.

我该怎么做才能满足这两个需求? 谢谢！

What should I do in order to accomplish both of the needs? Thanks!

推荐答案

dispatch_group应该具有您需要的所有内容.只需为您的工作单位使用dispatch_group_async/dispatch_group_enter，然后为您的完成处理程序派遣dispatch_group_notify.

dispatch_group should have all the pieces you need. Just dispatch_group_async/dispatch_group_enter for your work units, then dispatch_group_notify for your completion handler.

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