How to run code on the main thread using GCD async()
Swift version: 5.4
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.
SPONSORED From August 2nd to 8th you can join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 4.0 – see Hacking with Swift tutorial 9
Similar solutions…
- How to run code asynchronously using GCD async()
- How to run code when your app is terminated
- How to run code after a delay using asyncAfter() and perform()
- How to run some code when state changes using onChange()
- How to run code at a specific time
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
