Web Reference: Calling main.async or main.sync only changes the behavior of the queue you are calling from, affecting whether or not that queue is waiting for the block of code to be completed on the main queue. Nov 27, 2025 · When working with UI code, two methods of `DispatchQueue.main` are critical: `async` and `sync`. Understanding the difference between `DispatchQueue.main.async` and `DispatchQueue.main.sync` is essential for writing responsive, thread-safe, and crash-free apps. Jul 6, 2024 · You may already know that we can't use sync on the main queue. So, if we try to write something like this: DispatchQueue.main.sync { print("On main thread") } we’ll get a crash. But...
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