[platform_view]Send platform message when platform view is focused (#105050)

.ci.yaml

@@ -3657,6 +3657,17 @@ targets:
       - bin/**
       - .ci.yaml
 
+  - name: Mac native_platform_view_ui_tests_ios
+    bringup: true
+    recipe: devicelab/devicelab_drone
+    presubmit: false
+    timeout: 60
+    properties:
+      tags: >
+        ["devicelab", "hostonly"]
+      task_name: native_platform_view_ui_tests_ios
+    scheduler: luci
+
   - name: Mac run_release_test_macos
     recipe: devicelab/devicelab_drone
     timeout: 60

TESTOWNERS

@@ -195,7 +195,7 @@
 /dev/devicelab/bin/tasks/module_custom_host_app_name_test.dart @zanderso @flutter/tool
 /dev/devicelab/bin/tasks/module_host_with_custom_build_test.dart @zanderso @flutter/tool
 /dev/devicelab/bin/tasks/module_test.dart @zanderso @flutter/tool
-/dev/devicelab/bin/tasks/native_ui_tests_ios.dart @jmagman @flutter/engine
+/dev/devicelab/bin/tasks/native_platform_view_ui_tests_ios.dart @hellohuanlin @flutter/ios
 /dev/devicelab/bin/tasks/native_ui_tests_macos.dart @cbracken @flutter/desktop
 /dev/devicelab/bin/tasks/plugin_test.dart @stuartmorgan @flutter/plugin
 /dev/devicelab/bin/tasks/plugin_test_ios.dart @jmagman @flutter/ios

dev/devicelab/bin/tasks/native_platform_view_ui_tests_ios.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_devicelab/framework/devices.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/framework/ios.dart';
+import 'package:flutter_devicelab/framework/task_result.dart';
+import 'package:flutter_devicelab/framework/utils.dart';
+import 'package:path/path.dart' as path;
+
+Future<void> main() async {
+  await task(() async {
+    final String projectDirectory = '${flutterDirectory.path}/dev/integration_tests/ios_platform_view_tests';
+
+    await inDirectory(projectDirectory, () async {
+      section('Build clean');
+
+      await flutter('clean');
+
+      section('Build platform view app');
+
+      await flutter(
+        'build',
+        options: <String>[
+          'ios',
+          '-v',
+          '--release',
+          '--config-only',
+        ],
+      );
+    });
+
+    section('Run platform view XCUITests');
+
+    final Device device = await devices.workingDevice;
+    if (!await runXcodeTests(
+      platformDirectory: path.join(projectDirectory, 'ios'),
+      destination: 'id=${device.deviceId}',
+      testName: 'native_platform_view_ui_tests_ios',
+    )) {
+      return TaskResult.failure('Platform view XCUITests failed');
+    }
+
+    return TaskResult.success(null);
+  });
+}

dev/devicelab/lib/tasks/integration_tests.dart

@@ -83,6 +83,9 @@ TaskFunction createIOSPlatformViewTests() {
   return DriverTest(
     '${flutterDirectory.path}/dev/integration_tests/ios_platform_view_tests',
     'lib/main.dart',
+    extraOptions: <String>[
+      '--dart-define=ENABLE_DRIVER_EXTENSION=true',
+    ],
   );
 }
 

dev/integration_tests/ios_platform_view_tests/ios/PlatformViewUITests/PlatformViewUITests.m

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+@import XCTest;
+
+@interface XCUIElement(KeyboardFocus)
+@property (nonatomic, readonly) BOOL flt_hasKeyboardFocus;
+@end
+
+@implementation XCUIElement(KeyboardFocus)
+- (BOOL)flt_hasKeyboardFocus {
+  return [[self valueForKey:@"hasKeyboardFocus"] boolValue];
+}
+@end
+
+@interface PlatformViewUITests : XCTestCase
+@property (strong) XCUIApplication *app;
+@end
+
+@implementation PlatformViewUITests
+
+- (void)setUp {
+  self.continueAfterFailure = NO;
+
+  self.app = [[XCUIApplication alloc] init];
+  [self.app launch];
+}
+- (void)testPlatformViewFocus {
+
+  XCUIElement *entranceButton = self.app.buttons[@"platform view focus test"];
+  XCTAssertTrue([entranceButton waitForExistenceWithTimeout:1]);
+  [entranceButton tap];
+
+  XCUIElement *platformView = self.app.textFields[@"platform_view[0]"];
+  XCTAssertTrue([platformView waitForExistenceWithTimeout:1]);
+  XCUIElement *flutterTextField = self.app.textFields[@"Flutter Text Field"];
+  XCTAssertTrue([flutterTextField waitForExistenceWithTimeout:1]);
+
+  [flutterTextField tap];
+  XCTAssertTrue([self.app.windows.element waitForExistenceWithTimeout:1]);
+  XCTAssertFalse(platformView.flt_hasKeyboardFocus);
+  XCTAssertTrue(flutterTextField.flt_hasKeyboardFocus);
+
+  // Tapping on platformView should unfocus the previously focused flutterTextField
+  [platformView tap];
+  XCTAssertTrue(platformView.flt_hasKeyboardFocus);
+  XCTAssertFalse(flutterTextField.flt_hasKeyboardFocus);
+}
+
+@end

dev/integration_tests/ios_platform_view_tests/ios/Runner.xcodeproj/project.pbxproj

@@ -14,8 +14,21 @@
 		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
 		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+		E09898DE2853DBE800064317 /* ViewFactory.m in Sources */ = {isa = PBXBuildFile; fileRef = E09898DD2853DBE800064317 /* ViewFactory.m */; };
+		E09898E12853DC3C00064317 /* TextFieldFactory.m in Sources */ = {isa = PBXBuildFile; fileRef = E09898E02853DC3C00064317 /* TextFieldFactory.m */; };
+		E09898E92853E9F000064317 /* PlatformViewUITests.m in Sources */ = {isa = PBXBuildFile; fileRef = E09898E82853E9F000064317 /* PlatformViewUITests.m */; };
 /* End PBXBuildFile section */
 
+/* Begin PBXContainerItemProxy section */
+		E09898EC2853E9F000064317 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 97C146E61CF9000F007C117D /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 97C146ED1CF9000F007C117D;
+			remoteInfo = Runner;
+		};
+/* End PBXContainerItemProxy section */
+
 /* Begin PBXCopyFilesBuildPhase section */
 		9705A1C41CF9048500538489 /* Embed Frameworks */ = {
 			isa = PBXCopyFilesBuildPhase;
@@ -44,6 +57,12 @@
 		97C146FD1CF9000F007C117D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		97C147001CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		97C147021CF9000F007C117D /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		E09898DC2853DBE800064317 /* ViewFactory.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ViewFactory.h; sourceTree = "<group>"; };
+		E09898DD2853DBE800064317 /* ViewFactory.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ViewFactory.m; sourceTree = "<group>"; };
+		E09898DF2853DC3C00064317 /* TextFieldFactory.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = TextFieldFactory.h; sourceTree = "<group>"; };
+		E09898E02853DC3C00064317 /* TextFieldFactory.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = TextFieldFactory.m; sourceTree = "<group>"; };
+		E09898E62853E9F000064317 /* PlatformViewUITests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = PlatformViewUITests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		E09898E82853E9F000064317 /* PlatformViewUITests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = PlatformViewUITests.m; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -54,6 +73,13 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		E09898E32853E9F000064317 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
@@ -73,6 +99,7 @@
 			children = (
 				9740EEB11CF90186004384FC /* Flutter */,
 				97C146F01CF9000F007C117D /* Runner */,
+				E09898E72853E9F000064317 /* PlatformViewUITests */,
 				97C146EF1CF9000F007C117D /* Products */,
 			);
 			sourceTree = "<group>";
@@ -81,6 +108,7 @@
 			isa = PBXGroup;
 			children = (
 				97C146EE1CF9000F007C117D /* Runner.app */,
+				E09898E62853E9F000064317 /* PlatformViewUITests.xctest */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -90,6 +118,10 @@
 			children = (
 				7AFFD8ED1D35381100E5BB4D /* AppDelegate.h */,
 				7AFFD8EE1D35381100E5BB4D /* AppDelegate.m */,
+				E09898DF2853DC3C00064317 /* TextFieldFactory.h */,
+				E09898E02853DC3C00064317 /* TextFieldFactory.m */,
+				E09898DC2853DBE800064317 /* ViewFactory.h */,
+				E09898DD2853DBE800064317 /* ViewFactory.m */,
 				97C146FA1CF9000F007C117D /* Main.storyboard */,
 				97C146FD1CF9000F007C117D /* Assets.xcassets */,
 				97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */,
@@ -109,6 +141,14 @@
 			name = "Supporting Files";
 			sourceTree = "<group>";
 		};
+		E09898E72853E9F000064317 /* PlatformViewUITests */ = {
+			isa = PBXGroup;
+			children = (
+				E09898E82853E9F000064317 /* PlatformViewUITests.m */,
+			);
+			path = PlatformViewUITests;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -132,6 +172,24 @@
 			productReference = 97C146EE1CF9000F007C117D /* Runner.app */;
 			productType = "com.apple.product-type.application";
 		};
+		E09898E52853E9F000064317 /* PlatformViewUITests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = E09898EE2853E9F000064317 /* Build configuration list for PBXNativeTarget "PlatformViewUITests" */;
+			buildPhases = (
+				E09898E22853E9F000064317 /* Sources */,
+				E09898E32853E9F000064317 /* Frameworks */,
+				E09898E42853E9F000064317 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				E09898ED2853E9F000064317 /* PBXTargetDependency */,
+			);
+			name = PlatformViewUITests;
+			productName = PlatformViewUITests;
+			productReference = E09898E62853E9F000064317 /* PlatformViewUITests.xctest */;
+			productType = "com.apple.product-type.bundle.ui-testing";
+		};
 /* End PBXNativeTarget section */
 
 /* Begin PBXProject section */
@@ -144,6 +202,10 @@
 					97C146ED1CF9000F007C117D = {
 						CreatedOnToolsVersion = 7.3.1;
 					};
+					E09898E52853E9F000064317 = {
+						CreatedOnToolsVersion = 13.3.1;
+						TestTargetID = 97C146ED1CF9000F007C117D;
+					};
 				};
 			};
 			buildConfigurationList = 97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */;
@@ -160,6 +222,7 @@
 			projectRoot = "";
 			targets = (
 				97C146ED1CF9000F007C117D /* Runner */,
+				E09898E52853E9F000064317 /* PlatformViewUITests */,
 			);
 		};
 /* End PBXProject section */
@@ -176,6 +239,13 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		E09898E42853E9F000064317 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXShellScriptBuildPhase section */
@@ -216,12 +286,30 @@
 			files = (
 				978B8F6F1D3862AE00F588F7 /* AppDelegate.m in Sources */,
 				97C146F31CF9000F007C117D /* main.m in Sources */,
+				E09898E12853DC3C00064317 /* TextFieldFactory.m in Sources */,
 				1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
+				E09898DE2853DBE800064317 /* ViewFactory.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		E09898E22853E9F000064317 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				E09898E92853E9F000064317 /* PlatformViewUITests.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXSourcesBuildPhase section */
 
+/* Begin PBXTargetDependency section */
+		E09898ED2853E9F000064317 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 97C146ED1CF9000F007C117D /* Runner */;
+			targetProxy = E09898EC2853E9F000064317 /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
 /* Begin PBXVariantGroup section */
 		97C146FA1CF9000F007C117D /* Main.storyboard */ = {
 			isa = PBXVariantGroup;
@@ -454,6 +542,79 @@
 			};
 			name = Release;
 		};
+		E09898EF2853E9F000064317 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++17";
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GENERATE_INFOPLIST_FILE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				MARKETING_VERSION = 1.0;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = io.flutter.platformview.PlatformViewUITests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_TARGET_NAME = Runner;
+			};
+			name = Debug;
+		};
+		E09898F02853E9F000064317 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++17";
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GENERATE_INFOPLIST_FILE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				MARKETING_VERSION = 1.0;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = io.flutter.platformview.PlatformViewUITests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_TARGET_NAME = Runner;
+			};
+			name = Release;
+		};
+		E09898F12853E9F000064317 /* Profile */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++17";
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GENERATE_INFOPLIST_FILE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				MARKETING_VERSION = 1.0;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = io.flutter.platformview.PlatformViewUITests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_EMIT_LOC_STRINGS = NO;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_TARGET_NAME = Runner;
+			};
+			name = Profile;
+		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
@@ -477,6 +638,16 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		E09898EE2853E9F000064317 /* Build configuration list for PBXNativeTarget "PlatformViewUITests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				E09898EF2853E9F000064317 /* Debug */,
+				E09898F02853E9F000064317 /* Release */,
+				E09898F12853E9F000064317 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 97C146E61CF9000F007C117D /* Project object */;

dev/integration_tests/ios_platform_view_tests/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -27,8 +27,6 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-      </Testables>
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -38,8 +36,18 @@
             ReferencedContainer = "container:Runner.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "E09898E52853E9F000064317"
+               BuildableName = "PlatformViewUITests.xctest"
+               BlueprintName = "PlatformViewUITests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -61,8 +69,6 @@
             ReferencedContainer = "container:Runner.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Profile"

dev/integration_tests/ios_platform_view_tests/ios/Runner/AppDelegate.m

@@ -4,43 +4,8 @@
 
 #import "AppDelegate.h"
 #import "GeneratedPluginRegistrant.h"
-
-@interface PlatformView: NSObject<FlutterPlatformView>
-
-@property (strong, nonatomic) UIView *platformView;
-
-@end
-
-@implementation PlatformView
-
-- (instancetype)init
-{
-  self = [super init];
-  if (self) {
-    self.platformView = [[UIView alloc] init];
-    self.platformView.backgroundColor = [UIColor blueColor];
-  }
-  return self;
-}
-
-- (UIView *)view {
-  return self.platformView;
-}
-
-@end
-
-@interface ViewFactory: NSObject<FlutterPlatformViewFactory>
-
-@end
-
-@implementation ViewFactory
-
-- (NSObject<FlutterPlatformView> *)createWithFrame:(CGRect)frame viewIdentifier:(int64_t)viewId arguments:(id)args {
-  PlatformView *platformView = [[PlatformView alloc] init];
-  return platformView;
-}
-
-@end
+#import "ViewFactory.h"
+#import "TextFieldFactory.h"
 
 @implementation AppDelegate
 
@@ -48,7 +13,9 @@
     didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   [GeneratedPluginRegistrant registerWithRegistry:self];
   // Override point for customization after application launch.
-  [[self registrarForPlugin:@"flutter"] registerViewFactory:[ViewFactory new] withId:@"platform_view"];
+  id<FlutterPluginRegistrar> registrar = [self registrarForPlugin:@"flutter"];
+  [registrar registerViewFactory:[[ViewFactory alloc] init] withId:@"platform_view"];
+  [registrar registerViewFactory:[[TextFieldFactory alloc] init] withId:@"platform_text_field"];
   return [super application:application didFinishLaunchingWithOptions:launchOptions];
 }
 

dev/integration_tests/ios_platform_view_tests/ios/Runner/TextFieldFactory.h

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface TextFieldFactory : NSObject<FlutterPlatformViewFactory>
+
+@end
+
+NS_ASSUME_NONNULL_END

dev/integration_tests/ios_platform_view_tests/ios/Runner/TextFieldFactory.m

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "TextFieldFactory.h"
+
+@interface PlatformTextField: NSObject<FlutterPlatformView>
+
+@property (strong, nonatomic) UITextField *textField;
+
+@end
+
+@implementation PlatformTextField
+
+- (instancetype)init
+{
+  self = [super init];
+  if (self) {
+    _textField = [[UITextField alloc] init];
+    _textField.text = @"Platform Text Field";
+  }
+  return self;
+}
+
+- (UIView *)view {
+  return self.textField;
+}
+
+@end
+
+@implementation TextFieldFactory
+
+- (NSObject<FlutterPlatformView> *)createWithFrame:(CGRect)frame viewIdentifier:(int64_t)viewId arguments:(id)args {
+  return [[PlatformTextField alloc] init];
+}
+
+@end

dev/integration_tests/ios_platform_view_tests/ios/Runner/ViewFactory.h

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface ViewFactory: NSObject<FlutterPlatformViewFactory>
+
+@end
+
+NS_ASSUME_NONNULL_END

dev/integration_tests/ios_platform_view_tests/ios/Runner/ViewFactory.m

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ViewFactory.h"
+
+@interface PlatformView: NSObject<FlutterPlatformView>
+
+@property (strong, nonatomic) UIView *platformView;
+
+@end
+
+@implementation PlatformView
+
+- (instancetype)init
+{
+  self = [super init];
+  if (self) {
+    _platformView = [[UIView alloc] init];
+    _platformView.backgroundColor = [UIColor blueColor];
+  }
+  return self;
+}
+
+- (UIView *)view {
+  return self.platformView;
+}
+
+@end
+
+
+@implementation ViewFactory
+
+- (NSObject<FlutterPlatformView> *)createWithFrame:(CGRect)frame viewIdentifier:(int64_t)viewId arguments:(id)args {
+  return [[PlatformView alloc] init];
+}
+
+@end

dev/integration_tests/ios_platform_view_tests/lib/main.dart

@@ -6,7 +6,12 @@ import 'package:flutter/material.dart';
 import 'package:flutter_driver/driver_extension.dart';
 
 void main() {
+  // enableFlutterDriverExtension() will disable keyboard,
+  // which is required for flutter_driver tests
+  // But breaks the XCUITests
+  if (const bool.fromEnvironment('ENABLE_DRIVER_EXTENSION')) {
     enableFlutterDriverExtension();
+  }
   runApp(const MyApp());
 }
 
@@ -26,7 +31,7 @@ class MyApp extends StatelessWidget {
   }
 }
 
-/// A page with a button in the center.
+/// A page with several buttons in the center.
 ///
 /// On press the button, a page with platform view should be pushed into the scene.
 class MyHomePage extends StatefulWidget {
@@ -51,8 +56,8 @@ class _MyHomePageState extends State<MyHomePage> {
           onPressed: () {
             Navigator.push(
               context,
-              MaterialPageRoute<PlatformViewPage>(
-                  builder: (BuildContext context) => const PlatformViewPage()),
+              MaterialPageRoute<MergeThreadTestPage>(
+                  builder: (BuildContext context) => const MergeThreadTestPage()),
             );
           },
         ),
@@ -62,14 +67,25 @@ class _MyHomePageState extends State<MyHomePage> {
           child: const Text('Tap to unmerge threads'),
           onPressed: () {},
         ),
+        TextButton(
+          key: const ValueKey<String>('platform_view_focus_test'),
+          child: const Text('platform view focus test'),
+          onPressed: () {
+            Navigator.push(
+              context,
+              MaterialPageRoute<FocusTestPage>(
+                  builder: (BuildContext context) => const FocusTestPage()),
+            );
+          },
+        ),
       ]),
     );
   }
 }
 
-/// A page contains the platform view to be tested.
-class PlatformViewPage extends StatelessWidget {
-  const PlatformViewPage({super.key});
+/// A page to test thread merge for platform view.
+class MergeThreadTestPage extends StatelessWidget {
+  const MergeThreadTestPage({super.key});
 
   static Key button = const ValueKey<String>('plus_button');
 
@@ -77,7 +93,7 @@ class PlatformViewPage extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text('Platform View'),
+        title: const Text('Platform View Thread Merge Tests'),
       ),
       body: Column(
         children: <Widget>[
@@ -97,3 +113,44 @@ class PlatformViewPage extends StatelessWidget {
     );
   }
 }
+
+/// A page to test platform view focus.
+class FocusTestPage extends StatefulWidget {
+  const FocusTestPage({super.key});
+
+  @override
+  State<FocusTestPage> createState() => _FocusTestPageState();
+}
+
+class _FocusTestPageState extends State<FocusTestPage> {
+
+  late TextEditingController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = TextEditingController();
+    _controller.text = 'Flutter Text Field';
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Platform View Focus Tests'),
+      ),
+      body: Column(
+        children: <Widget>[
+          const SizedBox(
+            width: 300,
+            height: 50,
+            child: UiKitView(viewType: 'platform_text_field'),
+          ),
+          TextField(
+            controller: _controller,
+          ),
+        ],
+      ),
+    );
+  }
+}

packages/flutter/lib/src/widgets/platform_view.dart

@@ -569,12 +569,13 @@ class _UiKitViewState extends State<UiKitView> {
 
   @override
   Widget build(BuildContext context) {
-    if (_controller == null) {
+    final UiKitViewController? controller = _controller;
+    if (controller == null) {
       return const SizedBox.expand();
     }
     return Focus(
       focusNode: _focusNode,
-      onFocusChange: _onFocusChange,
+      onFocusChange: (bool isFocused) => _onFocusChange(isFocused, controller),
       child: _UiKitPlatformView(
         controller: _controller!,
         hitTestBehavior: widget.hitTestBehavior,
@@ -659,8 +660,17 @@ class _UiKitViewState extends State<UiKitView> {
     });
   }
 
-  void _onFocusChange(bool isFocused) {
-    // TODO(hellohuanlin): send 'TextInput.setPlatformViewClient' channel message to engine after the engine is updated to handle this message.
+  void _onFocusChange(bool isFocused, UiKitViewController controller) {
+    if (!isFocused) {
+      // Unlike Android, we do not need to send "clearFocus" channel message
+      // to the engine, because focusing on another view will automatically
+      // cancel the focus on the previously focused platform view.
+      return;
+    }
+    SystemChannels.textInput.invokeMethod<void>(
+      'TextInput.setPlatformViewClient',
+      <String, dynamic>{'platformViewId': controller.id},
+    );
   }
 }
 

packages/flutter/test/widgets/platform_view_test.dart

@@ -2064,6 +2064,45 @@ void main() {
       expect(uiKitViewFocusNode.hasFocus, isTrue);
     });
 
+    testWidgets('UiKitView sends TextInput.setPlatformViewClient when focused', (WidgetTester tester) async {
+
+      final int currentViewId = platformViewsRegistry.getNextPlatformViewId();
+      final FakeIosPlatformViewsController viewsController = FakeIosPlatformViewsController();
+      viewsController.registerViewType('webview');
+
+      await tester.pumpWidget(
+        const UiKitView(viewType: 'webview', layoutDirection: TextDirection.ltr)
+      );
+
+      // First frame is before the platform view was created so the render object
+      // is not yet in the tree.
+      await tester.pump();
+
+      final Focus uiKitViewFocusWidget = tester.widget(
+        find.descendant(
+          of: find.byType(UiKitView),
+          matching: find.byType(Focus),
+        ),
+      );
+      final FocusNode uiKitViewFocusNode = uiKitViewFocusWidget.focusNode!;
+
+      late Map<String, dynamic> channelArguments;
+      tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.textInput, (MethodCall call) {
+        if (call.method == 'TextInput.setPlatformViewClient') {
+          channelArguments = call.arguments as Map<String, dynamic>;
+        }
+        return null;
+      });
+
+      expect(uiKitViewFocusNode.hasFocus, false);
+
+      uiKitViewFocusNode.requestFocus();
+      await tester.pump();
+
+      expect(uiKitViewFocusNode.hasFocus, true);
+      expect(channelArguments['platformViewId'], currentViewId + 1);
+    });
+
     testWidgets('UiKitView has correct semantics', (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
       final int currentViewId = platformViewsRegistry.getNextPlatformViewId();