iOS app delegate implementing a Flutter method channel for file sharing

AppDelegate.swift

@objc class AppDelegate: FlutterAppDelegate {
    
    override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Receive the share method channel
        let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
        let shareChannel = FlutterMethodChannel(name: "jademind.com/share", binaryMessenger: controller.binaryMessenger)
        
        // Register a callback handler
        shareChannel.setMethodCallHandler({
            (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            if (call.method == "share-file") {
                self.shareFile(arguments: call.arguments);
            }
        })
        
        GeneratedPluginRegistrant.register(with: self)
        
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }
    
    // further implementation goes here
    
}