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dispatch_group使用wait时的forever时长问题分析

dispatch_group使用wait时的forever时长问题分析

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你在使用dispatch_group时，会遇到一个小陷阱：任务在dispatch_group_notify里的代码会比dispatch_group_async里异步执行的任务先执行。这个问题常常出现在任务块是异步操作的时候。当任务块是同步操作时，不管用哪种方式，结果都不会受到影响。所以，你在用dispatch_group时，要小心，避免这个坑。如果你想确保任务按顺序执行，记得注意任务块的同步与异步差异。

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dispatch_group.zip 预估大小：60个文件
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