Wednesday, July 6, 2022
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ios – onChange not detecting AppDelegate Replace in SwiftUI


I’ve an AppDelegate in my SwiftUI app, and I set a ViewModel like so:

class AppDelegate: NSObject, UIApplicationDelegate, ObservableObject {
    var AppNavigator: ApplicationNavigator = ApplicationNavigator()
}

That is my ApplicationNavigator View Mannequin:

class ApplicationNavigator: ObservableObject {
    @Printed var applicationNavigation: ApplicationNavigatorItem = ApplicationNavigatorItem(id: "default")
}

The place ApplicationNavigator takes an ApplicationNavigatorItem:

struct ApplicationNavigatorItem: Identifiable, Codable  {
    var id: String? = UUID().uuidString
}

And when a consumer faucets on a distant notification, I replace the AppNavigator in my AppDelegate with a brand new ApplicationNavigatorItem:

func userNotificationCenter(_ middle: UNUserNotificationCenter,
                              didReceive response: UNNotificationResponse,
                              withCompletionHandler completionHandler: @escaping () -> Void) {

    self.AppNavigator.applicationNavigation = ApplicationNavigatorItem(
        id: newUUID
    )
}

Now to the SwiftUI half.

In my views, I’ve shared appDelegate as an setting object with my view, since I wish to hear for adjustments to appDelgate.AppNavigator.applicationNavigation.id.

I’ve set an onChanged modifier to my primary view:

.onChange(of: appDelegate.AppNavigator.applicationNavigation.id) { _ in
    DispatchQueue.primary.async {
        appDelegate.AppNavigator.navigate()
    }
}

And this solely works if the consumer is tapping the push notification when the app is within the background.

Nonetheless, if a consumer receives the push notification whereas they’re contained in the app, and it’s energetic, nothing occurs after they faucet it.

Oddly sufficient, after tapping a notification whereas contained in the app, (the place nothing occurs) if I swipe the app up till it is scenePhase is .inactive || .background, and re-open the app, the code inside .onChange(..) { _ in // code } lastly runs.

I’ve even put a Textual content(appDelegate.AppNavigator.applicationNavigation.id!) on the principle view to see if appDelegate.AppNavigator.applicationNavigation.id has modified, however it would not if I am nonetheless contained in the app.

I am making an attempt to ship the consumer to a selected view in the event that they faucet on a notification, and generally they could be contained in the app. Can anybody assist me see the place I’ve made a mistake?

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