Add Flutter to your existing app

flutter build aar

// Include the host app project.
include ':app'                                    // assumed existing content

// Add the following lines to your project
setBinding(new Binding([gradle: this]))                            
evaluate(new File(                                               
settingsDir.parentFile,                                        
'tencent_chat_module/.android/include_flutter.groovy'            
))                                                                 

dependencies {
implementation project(':flutter')
}

// The path of your Flutter module
flutter_chat_application_path = '../tencent_chat_module'

load File.join(flutter_chat_application_path, '.ios', 'Flutter', 'podhelper.rb')

target 'MyApp' do
install_all_flutter_pods(flutter_chat_application_path)
end

post_install do |installer|
flutter_post_install(installer) if defined?(flutter_post_install)
installer.pods_project.targets.each do |target|
   flutter_additional_ios_build_settings(target)
   target.build_configurations.each do |config|
         config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
           '$(inherited)',
           'PERMISSION_MICROPHONE=1',
           'PERMISSION_CAMERA=1',
           'PERMISSION_PHOTOS=1',
         ]
       end
 end
end

flutter build ios-framework --output=some/path/MyApp/Flutter/

cd some/path/
flutter create --template module tencent_chat_module

tencent_chat_module/
├── .ios/
│   ├── Runner.xcworkspace
│   └── Flutter/podhelper.rb
├── lib/
│   └── main.dart
├── test/
└── pubspec.yaml

tencent_chat_module/
├── lib/
│   └── call/
│   └── chat/
│   └── common/

class ChatInfo {
String? sdkappid;
String? userSig;
String? userID;

ChatInfo.fromJSON(Map<String, dynamic> json) {
  sdkappid = json["sdkappid"].toString();
  userSig = json["userSig"].toString();
  userID = json["userID"].toString();
}

Map<String, String> toMap(){
  final Map<String, String> map = {};
  if(sdkappid != null){
    map["sdkappid"] = sdkappid!;
  }
  if(userSig != null){
    map["userSig"] = userSig!;
  }
  if(userID != null){
    map["userID"] = userID!;
  }
  return map;
}
}

class CallInfo{
String? userID;
String? groupID;

CallInfo();

CallInfo.fromJSON(Map<String, dynamic> json) {
  groupID = json["groupID"].toString();
  userID = json["userID"].toString();
}

Map<String, String> toMap(){
  final Map<String, String> map = {};
  if(userID != null){
    map["userID"] = userID!;
  }
  if(groupID != null){
    map["groupID"] = groupID!;
  }
  return map;
}
}

void main() {
WidgetsFlutterBinding.ensureInitialized();

runApp(MaterialApp(
  title: 'Flutter Demo',
  theme: ThemeData(
    primarySwatch: Colors.blue,
  ),
  home: Container(),
));
}

@pragma('vm:entry-point')
void chatMain() {
// This call ensures the Flutter binding has been set up before creating the
// MethodChannel-based model.
WidgetsFlutterBinding.ensureInitialized();

final model = ChatInfoModel();

runApp(
  ChangeNotifierProvider.value(
    value: model,
    child: const ChatAPP(),
  ),
);
}

@pragma('vm:entry-point')
void callMain() {
// This call ensures the Flutter binding has been set up before creating the
// MethodChannel-based model.
WidgetsFlutterBinding.ensureInitialized();

final model = CallInfoModel();

runApp(
  ChangeNotifierProvider.value(
    value: model,
    child: const CallAPP(),
  ),
);
}

@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
lazy var flutterEngines = FlutterEngineGroup(name: "chat.flutter.tencent", project: nil)
...
}

@SuppressLint("StaticFieldLeak")
object FlutterUtils {}

lateinit var context : Context
lateinit var flutterEngines: FlutterEngineGroup
private lateinit var chatFlutterEngine:FlutterEngine
private lateinit var callFlutterEngine:FlutterEngine

lateinit var chatMethodChannel: MethodChannel
lateinit var callMethodChannel: MethodChannel

// Initialize them
flutterEngines = FlutterEngineGroup(context)
...

class MyApplication : MultiDexApplication() {

   override fun onCreate() {
       super.onCreate()
       FlutterUtils.context = this // new
       FlutterUtils.init()         // new
   }
}

cd some/path/
flutter create --template module tencent_chat_module

tencent_chat_module/
├── .ios/
│   ├── Runner.xcworkspace
│   └── Flutter/podhelper.rb
├── lib/
│   └── main.dart
├── test/
└── pubspec.yaml

import UIKit
import Flutter
import FlutterPluginRegistrant

@UIApplicationMain
class AppDelegate: FlutterAppDelegate { // More on the FlutterAppDelegate.
 lazy var flutterEngine = FlutterEngine(name: "tencent cloud chat")

 override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
   // Runs the default Dart entry point with a default Flutter route.
   flutterEngine.run();
   GeneratedPluginRegistrant.register(with: self.flutterEngine);
   return super.application(application, didFinishLaunchingWithOptions: launchOptions);
 }
}

@SuppressLint("StaticFieldLeak")
object FlutterUtils {}

lateinit var context : Context
private lateinit var flutterEngine:FlutterEngine


flutterEngine = FlutterEngine(context)

class MyApplication : MultiDexApplication() {

   override fun onCreate() {
       super.onCreate()
       FlutterUtils.context = this // new
       FlutterUtils.init()         // new
   }
}

import ImSDK_Plus


func initTencentChat(){
       if(isLoginSuccess == true){
           return
       }
       let data = V2TIMManager.sharedInstance().initSDK( Yours SDKAPPID , config: nil);
       if (data == true){
           V2TIMManager.sharedInstance().login(
               chatInfo.userID,
               userSig: chatInfo.userSig,
               succ: {
                   self.isLoginSuccess = true
                   self.reportChatInfo()
               },
               fail: onLoginFailed()
           )
       }
}

final CoreServicesImpl _coreInstance = TIMUIKitCore.getInstance();
_coreInstance.setDataFromNative(userId: chatInfo?.userID ?? "");