Closed
Description
Is there an existing issue for this?
- I have searched the existing issues
- I have read the guide to filing a bug
Steps to reproduce
- Generate the first FlutterEngine using FlutterEngineGroup and initialize a FlutterViewController for the initial display.
- Display a PlatformView within the generated first FlutterViewController.
- Transition to a native ViewController using MethodChannel.
- Generate the second FlutterEngine using FlutterEngineGroup and transition to the second FlutterViewController.
- Display a PlatformView within the second FlutterViewController.
- Pop the second FlutterViewController and the native ViewController, returning to the first FlutterViewController.
Expected results
You can interact with the first FlutterViewController.
Actual results
Gestures are not recognized, and it becomes unresponsive in the first FlutterViewController.
Code sample
AppDelegate.swift
import UIKit
import Flutter
import GoogleMaps
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
let engines = FlutterEngineGroup(name: "multiple-flutters", project: nil)
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
let navigationController = UINavigationController(rootViewController: MyFlutterViewController(withEntrypoint: nil))
window?.rootViewController = navigationController
window?.makeKeyAndVisible()
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}MyFlutterViewController
import Flutter
class MyFlutterViewController: FlutterViewController {
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
init(withEntrypoint entryPoint: String?) {
let appDelegate: AppDelegate = UIApplication.shared.delegate as! AppDelegate
let newEngine = appDelegate.engines.makeEngine(withEntrypoint: entryPoint, libraryURI: nil)
GeneratedPluginRegistrant.register(with: newEngine)
super.init(engine: newEngine, nibName: nil, bundle: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
let methodChannel = FlutterMethodChannel(
name: "methodChannel",
binaryMessenger: self.binaryMessenger
)
methodChannel.setMethodCallHandler({[weak self] (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
guard let self = self else { return }
switch call.method {
case "transitionToNativePage":
let viewController = MyViewController()
self.navigationController?.pushViewController(viewController, animated: true)
default:
result(FlutterMethodNotImplemented)
}
})
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.setNavigationBarHidden(true, animated: true)
}
}MyViewController.swift
import UIKit
class MyViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
let button = UIButton(type: .system)
button.setTitle("Show Flutter Screen", for: .normal)
button.addTarget(self, action: #selector(buttonTapped(_:)), for: .touchUpInside)
self.view.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
button.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
button.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.setNavigationBarHidden(false, animated: true)
}
@objc func buttonTapped(_ sender: Any) {
let viewController = MyFlutterViewController(withEntrypoint: "platformViewMain")
self.navigationController?.pushViewController(viewController, animated: true)
}
}main.dart
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:webview_flutter/webview_flutter.dart';
enum EntryPoint {
main,
platformView,
}
Future<void> main() async {
runApp(const MainApp());
}
@pragma('vm:entry-point')
Future<void> platformViewMain() async {
runApp(const PlatformViewApp());
}
class MainApp extends StatelessWidget {
const MainApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MainPage(),
);
}
}
class MainPage extends StatelessWidget {
const MainPage({Key? key}) : super(key: key);
static const methodChannel = MethodChannel('methodChannel');
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('MainPage'),
),
body: Center(
child: ListView(
children: [
TextButton(
child: const Text('Transition to native page'),
onPressed: () async {
await methodChannel.invokeMapMethod('transitionToNativePage');
},
),
const SizedBox(height: 20),
TextButton(
child: const Text('Transition to platformView page'),
onPressed: () async {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return const PlatformViewPage(
entryPoint: EntryPoint.main);
},
),
);
},
)
],
),
),
);
}
}
class PlatformViewApp extends StatelessWidget {
const PlatformViewApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const PlatformViewPage(entryPoint: EntryPoint.platformView),
);
}
}
class PlatformViewPage extends StatelessWidget {
const PlatformViewPage({
required this.entryPoint,
Key? key,
}) : super(key: key);
final EntryPoint entryPoint;
static final controller = WebViewController()
..loadRequest(Uri.parse('https://flutter.dev'));
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('PlatformView Page'),
leading: entryPoint == EntryPoint.platformView
? BackButton(
onPressed: () => SystemNavigator.pop(animated: true),
)
: null,
),
body: WebViewWidget(
controller: controller,
), // This issue can be reproduced with PlatformViews such as GoogleMap or WebView.
);
}
}pubspec.yaml
dependencies:
flutter:
sdk: flutter
webview_flutter: ^4.2.0Logs
No error logs are specifically displayed.
Flutter Doctor output
Doctor output
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.7.3, on macOS 12.6.1 21G217 darwin-arm64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.1)
[✓] VS Code (version 1.78.2)
[✓] Connected device (3 available)
[✓] HTTP Host Availability
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High-priority issues at the top of the work listEmbedding Android/iOS views in Flutter appsStack traces logged to the consoleflutter/engine repository. See also e: labels.Found to occur in 3.10Found to occur in 3.11The issue has been confirmed reproducible and is ready to work oniOS applications specificallyIssue is closed as already fixed in a newer versionOwned by iOS platform teamTriaged by iOS platform team