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iosswiftmultithreadinguser-interfacensnotificationcenter

Best/most common way to update UI from background thread

I was posting notifications to the NSNotficiationCenter everytime I needed to get out of a closure to update the UI, but this started to get a bit tedious and made me wondering if there was a better way. After a quick search I found out that you can just dispatch to the main queue like this:

dispatch_async(dispatch_get_main_queue()) {
    // update some UI
}

This approach is less code for sure, but I wonder if it improves readability. So my question is, what is considered "the way to go" in Swift to update UI from a background thread?

Solution

  • This is the way to go:

    let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority, 0)) {
   // do some background task
   dispatch_async(dispatch_get_main_queue()) {
      // update some UI
   }
}