Hi! How can we use ON_PAUSE and ON_RESUME lifecycle functions in Compose Multiplatform as in Jetpack Compose in Android?

androidx.lifecycle.*

is currently Android-only

Any hint at how we can do this?

1.5.10-beta01 adds view controller lifetime hooks - https://github.com/JetBrains/compose-multiplatform-core/pull/779

This would require support from a navigation library. Decompose provides this support, and I think Decompose-Router as well. Maybe other navigation libraries have it as well, not sure.

Thank you for the response. Can you please suggest how can I use it in Compose? Any sample?

There are samples and docs if you follow the links for the libraries. But there are no samples I'm aware of for just using the Essenty Lifecycle, without any library. But you can check the readme, it's pretty easy.

https://github.com/arkivanov/Essenty#lifecyle I want to use Essenty, but there’s no sample here.

With Essenty you can use

LifecycleRegistry

. Then just override

applicationDidBecomeActive

,

applicationWillResignActive

and

applicationWillTerminate

and drive the lifecycle. Take a look here. Then you can create a composition local for

Lifecycle

so that it's available in every Composable.

Thank you for the response. How can we use this delegate property?

I guess something like this:

ComposeUIViewController {
    val lifecycle = remember { LifecycleRegistry() }

    delegate = 
        object : ComposeUIViewControllerDelegate {
            override fun viewWillAppear() {
                lifecycle.resume()
            }

            override fun viewDidDisappear() {
                lifecycle.stop()
            }
        }

    // The rest of the code
}

Though, I don't see any callback equivalent to onDestroy. In Swift we have

deinit

. So perhaps you could create and control the lifecycle in Swift and then just pass it to Compose and make it available with a composition local. Or, if you have just one Composable for the entire app, then you can implement

UIApplicationDelegate

instead, which gives

applicationWillTerminate

callback.

Thanks! Let me check