无法使用invokeMethod

问题描述

在我的Flutter App中，我想从本机iOS代码（从AppDelegate类的通知接收器）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方面，一切都已正确设置，并且从iOS双方一切都设置正确并且调用正确进行，但是从未调用过dart方法调用处理程序，并且从未收到过iOS中的invokeMethod调用的回调，不知道我是否缺少某些内容，这是我双方的代码：

在Swift端：

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侧：（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');
    }
  }

}

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）