Calling UIKit methods from other threads

Question

I have a function that must be called from a non-main thread. In that thread, I am trying to determine status bar orientation like this:

   let currentInterfaceOrientation = UIApplication.shared.statusBarOrientation

But I obviously get a run time warning like this.

    UIApplication.statusBarOrientation() must be used from main thread only

My question is how to determine status bar orientation on secondary thread if you need it? Using DispatchQueue.main.sync is the right way but is risky for the reasons of potential deadlocks.

   var currentInterfaceOrientation = UIInterfaceOrientation.landscapeLeft

   DispatchQueue.main.sync {
                currentInterfaceOrientation = UIApplication.shared.statusBarOrientation
            }

What are the safe ways here using Swift?

Answer 1

I have a function that must be called from a non-main thread.

Add the orientation as an argument to this function.