多线程，这是别人的博客，写得很详细，可以学习一下；
原文地址：http://blog.leichunfeng.com/blog/2015/07/29/ios-concurrency-programming-operation-queues/
详细解决方案
iOS 并发编程之 Operation Queues（别人博客写的很详细）
热度：72 发布时间：2023-12-09 12:09:49.0
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