How to use UIApplication.shared.open in reducer?

[Muhammed9991]

I am trying to create a location permission flow. I have a button which shows up if the user has denied location permission. They can click on the button and the action is sent to the reducer. Some checks are made to see if we can show the location permission modal or not. If we can't then using UIApplication.shared.open(URL(string: UIApplication.openSettingsURLString)!) I navigate them to the settings page for the app.

However, running UIApplication.shared.open directly in the reducer is not right because it will be running in a non-main thread. I can't figure out how I can run UIApplication.shared.open directly in the reducer. My initial idea was to use the @Dependency(\.openUrl). This can be used in

return .run { send in

   await openUrl(URL(string: UIApplication.openSettingsURLString)!)

}

This results in a runTImeWarning for TCA

ViewStore.send" was called on a non-main thread with...

I am able to move UIApplication.shared.open into the view and do something like this in the button action. I no longer get the purple warning. However, I would prefer to not have this in the view so it can be testable..

Task { @MainActor in
                                    UIApplication.shared.open(URL(string: UIApplication.openSettingsURLString)!)
 }

Any ideas will be helpful. Thanks

[mbrandonw]

The .run effect you posted above is the correct way to do this, and it cannot cause the runtime warning you showed. That warning only occurs when sending an action directly to a view store, which effects do not do. So there must be something else going on.

If you expand the warning in the left sidebar of Xcode it will show you a stack trace of where the the viewStore.send happened that caused the warning. Maybe that will help you track down what happened.

[Muhammed9991]

Thanks. Turned out the re-usable button component I was using had the onButtonTapped action as () async -> Void and the action it self was wrapped in a Task. Something like this.

Button {
    Task { 
        await onButtonTapped()
    }
 } label: {
            
 }

That's why I was getting the runtime warning