UIViewController interop

compose/mpp/demo-uikit/src/iosAppMain/apple/ContentView.swift

@@ -24,9 +24,20 @@ struct ContentView: View {
     }
 }
 
+struct NestedContentView: View {
+    let index: Int
+
+    var body: some View {
+        Text("Hello from SwiftUI #\(index)")
+    }
+}
+
 struct ComposeView: UIViewControllerRepresentable {
     func makeUIViewController(context: Context) -> UIViewController {
-        SwiftHelper().getViewController()
+        SwiftHelper().getViewController { index in
+            let viewController = UIHostingController(rootView: NestedContentView(index: Int(index)))
+            return viewController
+        }
     }
 
     func updateUIViewController(_ uiViewController: UIViewController, context: Context) {}

compose/mpp/demo-uikit/src/uikitMain/kotlin/androidx/compose/mpp/demo/SwiftHelper.kt

@@ -19,5 +19,5 @@ package androidx.compose.mpp.demo
 import platform.UIKit.UIViewController
 
 class SwiftHelper {
-    fun getViewController(): UIViewController = getViewControllerWithCompose()
+    fun getViewController(makeHostingViewController: (Int) -> UIViewController): UIViewController = getViewControllerWithCompose(makeHostingViewController)
 }

compose/mpp/demo-uikit/src/uikitMain/kotlin/androidx/compose/mpp/demo/getViewControllerWithCompose.kt

@@ -17,9 +17,10 @@
 package androidx.compose.mpp.demo
 
 import androidx.compose.ui.window.ComposeUIViewController
+import platform.UIKit.UIViewController
 
 // TODO This module is just a proxy to run the demo from mpp:demo. Figure out how to get rid of it.
 //  If it is removed, there is no available configuration in IDE
-fun getViewControllerWithCompose() = ComposeUIViewController {
-    IosDemo("")
+fun getViewControllerWithCompose(makeHostingViewController: (Int) -> UIViewController) = ComposeUIViewController {
+    IosDemo("", makeHostingViewController)
 }

compose/mpp/demo/src/uikitMain/kotlin/SwiftUIInteropExample.kt

@@ -0,0 +1,42 @@
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.mpp.demo.Screen
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.interop.UIKitViewController
+import androidx.compose.ui.unit.dp
+import platform.UIKit.UIViewController
+
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+fun SwiftUIInteropExample(makeViewController: (Int) -> UIViewController) = Screen.Example("SwiftUI interop example") {
+    LazyColumn(Modifier.fillMaxSize()) {
+        items(20) {
+            UIKitViewController(factory = {
+                makeViewController(it)
+            }, Modifier.fillMaxWidth().height(160.dp))
+            Spacer(Modifier.height(160.dp))
+        }
+    }
+}

compose/mpp/demo/src/uikitMain/kotlin/androidx/compose/mpp/demo/main.uikit.kt

@@ -2,11 +2,13 @@
 package androidx.compose.mpp.demo
 
 import NativeModalWithNaviationExample
+import SwiftUIInteropExample
 import androidx.compose.runtime.*
 import androidx.compose.ui.main.defaultUIKitMain
 import androidx.compose.ui.window.ComposeUIViewController
 import bugs.IosBugs
 import bugs.StartRecompositionCheck
+import platform.UIKit.UIViewController
 
 
 fun main(vararg args: String) {
@@ -17,13 +19,17 @@ fun main(vararg args: String) {
 }
 
 @Composable
-fun IosDemo(arg: String) {
+fun IosDemo(arg: String, makeHostingController: ((Int) -> UIViewController)? = null) {
     val app = remember {
         App(
             extraScreens = listOf(
                 IosBugs,
                 NativeModalWithNaviationExample,
-            )
+            ) + listOf(makeHostingController).mapNotNull {
+                it?.let {
+                    SwiftUIInteropExample(it)
+                }
+            }
         )
     }
     when (arg) {