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在我的 Flutter App 中，我想从本机 iOS 代码（从 AppDelegate 类中的通知接收器）调用 dart 方法，并且我正在使用带有 invokeMethod 的通道来实现这一点，从 dart 端，一切都设置正确，从 iOS 端一切都是设置正确并且调用正确发生，但从未调用 dart 方法调用处理程序，并且从未收到 iOS 中的 invokeMethod 调用的回调，不知道我是否遗漏了什么，这是我双方的代码：

在斯威夫特方面：

var channel = FlutterMethodChannel()

// channel is created when registering app plugins
func registerPlugins(with registry: FlutterPluginRegistry) {
    
    let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
    let redViewController = mainStoryBoard.instantiateViewController(withIdentifier: "AppIdentifier") as! FlutterViewController
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.window?.rootViewController = redViewController
     
    let controller : FlutterViewController = self.window.rootViewController as! FlutterViewController;
    self.channel = FlutterMethodChannel(name: "myApp.main/backgroundNotifications",
                                                      binaryMessenger: 
    controller.binaryMessenger);
}


// the background notification receiver
override func application(_ application: UIApplication,
didReceiveRemoteNotification userInfo: [AnyHashable : Any],
fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void){

  // comes here    
  DispatchQueue.main.async {
      self.channel.invokeMethod("toTo", arguments: userInfo, result: {(r:Any?) -> () in
          print(r.debugDescription);  // Never comes here
      })
  }
  // comes here with no errors of execution to previous call

}

在 Dart 方面：（在我的一个小部件类中）

class _HomeState extends State<Home> with SingleTickerProviderStateMixin {

  MethodChannel _channel =
  const MethodChannel('myApp.main/backgroundNotifications');

  @override
  void initState() {
    super.initState();
    .
    .
    .
    _channel.setMethodCallHandler(toTo);
  }

  Future<dynamic> toTo(MethodCall call) async {
    print("init state setMethodCallHandler ${call.method}"); // Never comes here
    switch (call.method) {
      case 'toTo':
        return 145.0;
      case 'bar':
        return 123.0;
      default:
        throw MissingPluginException('notImplemented');
    }
  }

}
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