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Come posso dispatch_sync, dispatch_async, dispatch_after, ecc. In Swift 3, Swift 4 e oltre?
Ho un sacco di codice nei progetti Swift 2.x (o anche 1.x) che assomiglia a questo: // 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.loadOrGenerateAnImage() // Bounce back to the main thread to update the UI dispatch_async(dispatch_get_main_queue()) { self.imageView.image = …