Simplify UIKitView example (#3618)

examples/interop/ios-uikit-in-compose/shared/src/iosMain/kotlin/UseUITextField.kt

@@ -1,8 +1,16 @@
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.interop.UIKitView
+import androidx.compose.ui.unit.dp
 import kotlinx.cinterop.ExperimentalForeignApi
 import kotlinx.cinterop.ObjCAction
 import platform.CoreGraphics.CGRectMake
@@ -10,24 +18,16 @@ import platform.Foundation.NSSelectorFromString
 import platform.UIKit.UIControlEventEditingChanged
 import platform.UIKit.UITextField
 
-/**
- * Compose wrapper for native UITextField.
- * @param value the input text to be shown in the text field.
- * @param onValueChange the callback that is triggered when the input service updates the text. An
- * updated text comes as a parameter of the callback
- * @param modifier a [Modifier] for this text field. Size should be specified in modifier.
- */
 @OptIn(ExperimentalForeignApi::class)
 @Composable
-fun ComposeUITextField(value: String, onValueChange: (String) -> Unit, modifier: Modifier) {
-    val latestOnValueChanged by rememberUpdatedState(onValueChange)
-
+fun UseUITextField() {
+    var message by remember { mutableStateOf("Hello, World!") }
     UIKitView(
         factory = {
             val textField = object : UITextField(CGRectMake(0.0, 0.0, 0.0, 0.0)) {
                 @ObjCAction
                 fun editingChanged() {
-                    latestOnValueChanged(text ?: "")
+                    message = text ?: ""
                 }
             }
             textField.addTarget(
@@ -37,9 +37,9 @@ fun ComposeUITextField(value: String, onValueChange: (String) -> Unit, modifier:
             )
             textField
         },
-        modifier = modifier,
+        modifier = Modifier.padding(4.dp).fillMaxWidth().height(30.dp).border(2.dp, Color.Blue),
         update = { textField ->
-            textField.text = value
+            textField.text = message
         }
     )
 }

examples/interop/ios-uikit-in-compose/shared/src/iosMain/kotlin/main.ios.kt

@@ -1,10 +1,6 @@
 import androidx.compose.foundation.border
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.Text
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -33,11 +29,6 @@ fun ComposeEntryPoint(): UIViewController =
 
             Spacer(Modifier.size(20.dp))
 
-            var text: String by remember { mutableStateOf("This is iOS UITextField inside Compose") }
-            ComposeUITextField(
-                text,
-                { text = it },
-                Modifier.padding(4.dp).fillMaxWidth().height(30.dp).border(2.dp, Color.Blue)
-            )
+            UseUITextField()
         }
     }