feat:Rely on NSLifecycleListener to get exit event

Author: KevinnZou

lifecycletracker/src/iosMain/kotlin/com.multiplatform.lifecyle/LifecycleComposeUIVCDelegate.kt

@@ -3,24 +3,54 @@ package com.multiplatform.lifecyle
 import androidx.compose.ui.uikit.ComposeUIViewControllerDelegate
 import com.multiplatform.lifecycle.LifecycleEvent
 import com.multiplatform.lifecycle.LifecycleTracker
+import kotlinx.cinterop.ExperimentalForeignApi
+import platform.Foundation.NSNotificationCenter
+import platform.Foundation.NSNotificationName
+import platform.Foundation.NSSelectorFromString
+import platform.UIKit.UIApplicationDidBecomeActiveNotification
+import platform.UIKit.UIApplicationDidEnterBackgroundNotification
+import platform.UIKit.UIApplicationWillEnterForegroundNotification
+import platform.UIKit.UIApplicationWillResignActiveNotification
+import platform.UIKit.UIApplicationWillTerminateNotification
 
 /**
  * Created By Kevin Zou On 2024/2/22
  */
-class LifecycleComposeUIVCDelegate(private val lifecycleTracker: LifecycleTracker) : ComposeUIViewControllerDelegate {
+class LifecycleComposeUIVCDelegate(private val lifecycleTracker: LifecycleTracker) :
+    ComposeUIViewControllerDelegate {
+
+    private val nsLifecycleListener = NSLifecycleListener(lifecycleTracker)
+
+    @OptIn(ExperimentalForeignApi::class)
+    fun addObserver(name: NSNotificationName, selectorName: String) {
+        NSNotificationCenter.defaultCenter.addObserver(
+            nsLifecycleListener,
+            selector = NSSelectorFromString("$selectorName:"),
+            name = name,
+            `object` = null,
+        )
+    }
+
+    private fun addLifecycleObservers() {
+        addObserver(UIApplicationWillEnterForegroundNotification, "willEnterForeground")
+        addObserver(UIApplicationDidBecomeActiveNotification, "didBecomeActive")
+        addObserver(UIApplicationWillResignActiveNotification, "willResignActive")
+        addObserver(UIApplicationDidEnterBackgroundNotification, "didEnterBackground")
+        addObserver(UIApplicationWillTerminateNotification, "willTerminate")
+    }
+
     override fun viewDidAppear(animated: Boolean) {
         super.viewDidAppear(animated)
-        lifecycleTracker.notifyListeners(LifecycleEvent.OnResumeEvent)
     }
 
     override fun viewDidDisappear(animated: Boolean) {
         super.viewDidDisappear(animated)
         lifecycleTracker.notifyListeners(LifecycleEvent.OnStopEvent)
-        lifecycleTracker.notifyListeners(LifecycleEvent.OnDestroyEvent)
     }
 
     override fun viewDidLoad() {
         super.viewDidLoad()
+        addLifecycleObservers()
         lifecycleTracker.notifyListeners(LifecycleEvent.OnCreateEvent)
     }