延迟执行的几种方式

1.GCD 延迟两秒spa dispatch_time_t sleepTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC));orm dispatch_after(sleepTime, dispatch_get_main_queue(),^{get //延迟执行相关代码it });form 2.performSe

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