dispatch-async

Understanding dispatch_async

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I have question around this code dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSData* data = [NSData dataWithContentsOfURL: kLatestKivaLoansURL]; [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES]; }); The first parameter of this code is dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) Are we asking this code to perform serial tasks on global queue whose definition itself is that it returns global concurrent queue of a given … Read more

How do I dispatch_sync, dispatch_async, dispatch_after, etc in Swift 3, Swift 4, and beyond?

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I have lots of code in Swift 2.x (or even 1.x) projects that looks like this: // 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 = image } } Or stuff … Read more