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zhangkn/dispatch_sync.m

Created May 4, 2018 06:42
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执行任务
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dispatch_sync.m
// GCD中有2个用来执行任务的函数
//1) 用同步的方式执行任务
dispatch_sync(dispatch_queue_t queue, dispatch_block_t block);//queue：队列 block：任务
//2) 用异步的方式执行任务
dispatch_async(dispatch_queue_t queue, dispatch_block_t block);
// 同步和异步的区别
同步：只能在当前线程中执行任务，不具备开启新线程的能力
异步：可以在新的线程中执行任务，具备开启新线程的能力
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