UIApplication delegate must be used from main thread only - Swift

Question

I am getting "runtime: UI API called from background thread: -[UIApplication delegate] must be used from main thread only " runtime issue for Fabric initialisation line. Not sure how to solve it. Please help

Thanks

Fabric.with([Crashlytics.self,Zendesk.self])

check once in your app where you used this `UIApplication delegate]` and `[UIApplication applicationState]` — Anbu.Karthik, Mar 27 '19 at 10:26
@Priyanka The issue is related to firebase which firebase version you are using ? — Muhammad Waqas Bhati, Mar 27 '19 at 10:40
@MuhammadWaqasBhati Following are Firebase versions:- - Firebase/Core (3.17.0) — Priyanka, Mar 27 '19 at 10:56
@Priyanka please update to latest firebase version or install 4.2.0 version add pod 'FirebaseCore' and update pod will resolve your issue. — Muhammad Waqas Bhati, Mar 27 '19 at 11:02
If you comment out that code, is that app working or still crashing ? — Midhun MP, Mar 27 '19 at 11:21
Normally, when you get that, you can tap on the item on the left (It looks like you have selected it.) and that will highlight the line that is a problem with a purple marker (not a yellow marker shown in the image.) If you can post the source to this file, so we can see the rest of the code, we may be able to find the real issue. — Mike Hay, Mar 27 '19 at 11:41

score 2 · Answer 1 · answered Mar 27 '19 at 10:46

2

It's because you are trying to access the UI from background thread. Just call the UI change in main thread.

DispatchQueue.main.async {
   application.statusBarStyle = UIStatusBarStyle.lightContent
}

UI process are maintained under main thread.

answered Mar 27 '19 at 10:46

fAiSaL

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I have Tried it but same issue @fAiSaL – Priyanka Mar 27 '19 at 10:55

UIApplication delegate must be used from main thread only - Swift

1 Answers1