I have the following code inside of a component: ...

# decompose

[Francis Mariano]

I have the following code inside of a component:

init {
    lifecycle.doOnStart { // make some action }
}

But the action is not called in iOS. Are there some reason???

[Jan]

have you hooked up your lifecycle on iOS?

[Francis Mariano]

hummm no 😞

btw I do know how to do that.

[Jan]

Have a look at the documentation e.g. https://arkivanov.github.io/Decompose/getting-started/quick-start/#ios-with-swiftui

[Francis Mariano]

ok thanks, I am using compose for ios, but I think is just to adapt it

[Jan]

this is my setup:

// iOSApp.swift
@main
struct iOSApp: App {
    @UIApplicationDelegateAdaptor private var appDelegate: AppDelegate

    @Environment(\.scenePhase) private var scenePhase

    var lifecycleHolder: LifecycleHolder { appDelegate.lifecycleHolder }

    var body: some Scene {
        WindowGroup {
            ComposeViewControllerToSwiftUI(lifecycleHolder.lifecycle)
                //.ignoresSafeArea()
                //.onTapGesture {
                    // Hide keyboard on tap outside of TextField
                    // UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
                //}
        }.onChange(of: scenePhase) { newPhase in
            switch newPhase {
                case .background: LifecycleRegistryExtKt.stop(lifecycleHolder.lifecycle)
                case .inactive: LifecycleRegistryExtKt.pause(lifecycleHolder.lifecycle)
                case .active: LifecycleRegistryExtKt.resume(lifecycleHolder.lifecycle)
                @unknown default: break
            }
        }
    }
}

class AppDelegate: NSObject, UIApplicationDelegate {
    let lifecycleHolder: LifecycleHolder = LifecycleHolder()
}

struct ComposeViewControllerToSwiftUI: UIViewControllerRepresentable {
    
    private let lifecycle: LifecycleRegistry
    
    init(_ lifecycle: LifecycleRegistry) {
        self.lifecycle = lifecycle
    }
    
    func makeUIViewController(context: Context) -> UIViewController {
       Main_iosKt.MainViewController(lifecycle: lifecycle)
    }

    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {}
}

class LifecycleHolder : ObservableObject {
    let lifecycle: LifecycleRegistry

    init() {
        lifecycle = LifecycleRegistryKt.LifecycleRegistry()
        
        LifecycleRegistryExtKt.create(lifecycle)
    }

    deinit {
        // Destroy the root component before it is deallocated
        LifecycleRegistryExtKt.destroy(lifecycle)
    }
}

and for compose-multiplatform I have something like this in src-set iOSMain defined:

fun MainViewController(lifecycle: Lifecycle): UIViewController {

    val root = RootComponent(
        componentContext = DefaultComponentContext(
            lifecycle = lifecycle,
            stateKeeper = StateKeeperDispatcher(),
            instanceKeeper = InstanceKeeperDispatcher()
        )
    )

    return ComposeUIViewController {
        AppContent(root)
    }
}

[Francis Mariano]

ahhh wait... I have an error in my code. Before I had the lifexcycle hooked, but I removed....damnnnn,

[Francis Mariano]

thank you so much for the help

[Jan]

glad to help

[Francis Mariano]

hello again

error: cannot find type 'LifecycleRegistry' in scope
    let lifecycle: LifecycleRegistry

[Francis Mariano]

I unable to find LifecycleRegistry in swift. import shared is ok

[Jan]

https://arkivanov.github.io/Decompose/getting-started/installation/#exporting-decompose-to-ios-framework

[Jan]

I think that the framework for iOS is not correctly build. All I can recommend is check this link

[Jan]

maybe you added the wrong decompose deps?

[Jan]

https://arkivanov.github.io/Decompose/getting-started/installation/#support-for-compose-for-ios-and-web-js-canvas-not-wasm

[Francis Mariano]

maybe you added the wrong decompose deps?

No, the dependencies is right, but I did not export the deps

[Francis Mariano]

Do you know the reason we need export???

[Jan]

probably to generate the correct header files for iOS

[Francis Mariano]

ahhh ok

[Francis Mariano]

@Jan worked fine, tks a lot