How to run code on the main thread using GCD async()
Swift offers you two ways to run code on the main thread: GCD and performSelector(onMainThread:). The first option looks like this:
DispatchQueue.main.async { [unowned self] in
self.yourCodeHere()
}The second option looks like this:
performSelector(onMainThread: #selector(yourCodeHere), with: nil, waitUntilDone: false)The GCD option (the first one) has the advantage that you can write your code inline, whereas the second one requires a dedicated method you can call.
Available from iOS 4.0 – see Hacking with Swift tutorial 9
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