How to handle mobile application lifecycle (Resumed, Paused, Destroyed...)?

[alessandrofrancesconi]

I'm building a cross-platform Android / iOS app using Avalonia 11.
I need to know when the app goes in background (e.g. on Android, when the user clicks the "menu" button, or locks the device).

For Android, the application events are documented here: https://developer.android.com/guide/components/activities/activity-lifecycle
For iOS: https://developer.apple.com/documentation/uikit/app_and_environment/managing_your_app_s_life_cycle

How to handle these events for both the platforms, on Avalonia?

[maxkatz6]

You have access to the Android Activity and iOS UIApplicationDelegate - you can use the same APIs to handle these events and call your services/viewmodels to handle them.

[LyleRolleman-plst]

How can I hook into those events for iOS?

Android conveniently provides methods to override but the AppDelegate doesn't seem to provide the same. I'm interested in applicationWillTerminate

[maxkatz6]

You should be able to add this method to your AppDelegate with Export attribute:

    public partial class AppDelegate : AvaloniaAppDelegate<App>
    {
        // protected override AppBuilder CustomizeAppBuilder {}

        [Export("applicationWillTerminate:")]
        public virtual void WillTerminate(UIApplication application)
        {
            
        }
    }

[maxkatz6]

Upd. In 11.1 we have some basic common events that can be handled for app activation/deactivation: https://docs.avaloniaui.net/docs/concepts/services/activatable-lifetime