Introduce defaultUIKitMain in compose library and use it from UIKit examples (#2426)

experimental/examples/chat-mpp/gradle.properties

@@ -1,4 +1,4 @@
-compose.version=1.3.0-alpha01-dev824
+compose.version=1.3.0-alpha01-dev827
 kotlin.version=1.7.10
 agp.version=7.0.4
 org.gradle.jvmargs=-Xmx3g

experimental/examples/chat-mpp/src/uikitMain/kotlin/main.uikit.kt

@@ -1,37 +1,8 @@
 import androidx.compose.ui.window.Application
-import kotlinx.cinterop.*
-import platform.UIKit.*
-import platform.Foundation.*
+import androidx.compose.ui.main.defaultUIKitMain
 
 fun main() {
-    val args = emptyArray<String>()
-    memScoped {
-        val argc = args.size + 1
-        val argv = (arrayOf("skikoApp") + args).map { it.cstr.ptr }.toCValues()
-        autoreleasepool {
-            UIApplicationMain(argc, argv, null, NSStringFromClass(SkikoAppDelegate))
-        }
-    }
-}
-
-class SkikoAppDelegate : UIResponder, UIApplicationDelegateProtocol {
-    companion object : UIResponderMeta(), UIApplicationDelegateProtocolMeta
-
-    @ObjCObjectBase.OverrideInit
-    constructor() : super()
-
-    private var _window: UIWindow? = null
-    override fun window() = _window
-    override fun setWindow(window: UIWindow?) {
-        _window = window
-    }
-
-    override fun application(application: UIApplication, didFinishLaunchingWithOptions: Map<Any?, *>?): Boolean {
-        window = UIWindow(frame = UIScreen.mainScreen.bounds)
-        window!!.rootViewController = Application("Chat") {
+    defaultUIKitMain("Chat", Application("Chat") {
         ChatApp()
-        }
-        window!!.makeKeyAndVisible()
-        return true
-    }
+    })
 }

experimental/examples/falling-balls-mpp/gradle.properties

@@ -1,4 +1,4 @@
-compose.version=1.3.0-alpha01-dev824
+compose.version=1.3.0-alpha01-dev827
 kotlin.version=1.7.10
 agp.version=7.0.4
 org.gradle.jvmargs=-Xmx3g

experimental/examples/falling-balls-mpp/src/uikitMain/kotlin/main.uikit.kt

@@ -10,40 +10,14 @@ import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Application
-import kotlinx.cinterop.*
-import platform.UIKit.*
-import platform.Foundation.*
+import androidx.compose.ui.main.defaultUIKitMain
 
 object UikitTime : Time {
     override fun now(): Long = kotlin.system.getTimeNanos()
 }
 
 fun main() {
-    val args = emptyArray<String>()
-    memScoped {
-        val argc = args.size + 1
-        val argv = (arrayOf("skikoApp") + args).map { it.cstr.ptr }.toCValues()
-        autoreleasepool {
-            UIApplicationMain(argc, argv, null, NSStringFromClass(SkikoAppDelegate))
-        }
-    }
-}
-
-class SkikoAppDelegate : UIResponder, UIApplicationDelegateProtocol {
-    companion object : UIResponderMeta(), UIApplicationDelegateProtocolMeta
-
-    @ObjCObjectBase.OverrideInit
-    constructor() : super()
-
-    private var _window: UIWindow? = null
-    override fun window() = _window
-    override fun setWindow(window: UIWindow?) {
-        _window = window
-    }
-
-    override fun application(application: UIApplication, didFinishLaunchingWithOptions: Map<Any?, *>?): Boolean {
-        window = UIWindow(frame = UIScreen.mainScreen.bounds)
-        window!!.rootViewController = Application("Falling Balls") {
+    defaultUIKitMain("FallingBalls", Application("Falling Balls") {
         val game = remember { Game(UikitTime) }
         Column {
             // To skip upper part of screen.
@@ -51,8 +25,5 @@ class SkikoAppDelegate : UIResponder, UIApplicationDelegateProtocol {
                 .height(100.dp))
             FallingBalls(game)
         }
-        }
-        window!!.makeKeyAndVisible()
-        return true
-    }
+    })
 }

experimental/examples/minesweeper/build.gradle.kts

@@ -16,7 +16,7 @@ buildscript {
 
 plugins {
     kotlin("multiplatform") version "1.7.10"
-    id("org.jetbrains.compose") version "1.3.0-alpha01-dev824"
+    id("org.jetbrains.compose") version "1.3.0-alpha01-dev827"
 }
 
 version = "1.0-SNAPSHOT"

experimental/examples/minesweeper/src/uikitMain/kotlin/main.uikit.kt

@@ -14,46 +14,17 @@ import androidx.compose.ui.graphics.drawscope.DrawScope
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Application
-import kotlinx.cinterop.*
-import platform.UIKit.*
-import platform.Foundation.*
+import androidx.compose.ui.main.defaultUIKitMain
 
 fun main() {
-    val args = emptyArray<String>()
-    memScoped {
-        val argc = args.size + 1
-        val argv = (arrayOf("skikoApp") + args).map { it.cstr.ptr }.toCValues()
-        autoreleasepool {
-            UIApplicationMain(argc, argv, null, NSStringFromClass(SkikoAppDelegate))
-        }
-    }
-}
-
-class SkikoAppDelegate : UIResponder, UIApplicationDelegateProtocol {
-    companion object : UIResponderMeta(), UIApplicationDelegateProtocolMeta
-
-    @ObjCObjectBase.OverrideInit
-    constructor() : super()
-
-    private var _window: UIWindow? = null
-    override fun window() = _window
-    override fun setWindow(window: UIWindow?) {
-        _window = window
-    }
-
-    override fun application(application: UIApplication, didFinishLaunchingWithOptions: Map<Any?, *>?): Boolean {
-        window = UIWindow(frame = UIScreen.mainScreen.bounds)
-        window!!.rootViewController = Application("Minesweeper") {
+    defaultUIKitMain("Minesweeper", Application("Minesweeper") {
         Column {
             // To skip upper part of screen.
             Box(modifier = Modifier
                 .height(100.dp))
             Game()
         }
-        }
-        window!!.makeKeyAndVisible()
-        return true
-    }
+    })
 }
 
 @Composable