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如何在Swift 3,Swift 4及更高版本中调度dispync,dispatch_async,dispatch_after等?
我在Swift 2.x(甚至1.x)项目中有很多代码,如下所示: // Move to a background thread to do some long running work dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) { let image = self.loadOr...