未定義名稱 '_LoginController' Flutter - Dart

Question

I'm new with flutter and Dart, I'm trying to use a method that's on my controller called LoginController, i already imported it but when i call the instance of my controller in a widget method theres an error that says Undefined name '_LoginController ，需要一些幫助，請！

這是我的代碼：

錯誤信息：

Undefined name '_LoginController'. (Documentation)  Try correcting the name to one that is defined, or defining the name.

AndroidStudio 的建議是：

導入： import 'package:delivery_app/src/login/login_controller.dart';

class _LoginPageState 上的實例：

class _LoginPageState extends State<LoginPage> {

  LoginController _LoginController = new LoginController();

  @override
  void initState() {//Primer metodo que se ejecuta cuando inicial el App
    // TODO: implement initState
    super.initState();

    SchedulerBinding.instance.addPostFrameCallback((timeStamp) {//Inicializa controladores
      _LoginController.init(context);
    });
  }

我在 onTap function 中調用 controller 實例的小部件方法：

Widget _rowElement(BuildContext context){
  return Row(
    mainAxisAlignment: MainAxisAlignment.center,
    children: [
      Text(
        'No tienes Cuenta?',
        style: TextStyle(
            color: MyColors.primaryColor
        ),
      ),
      const SizedBox(width: 7,),
      GestureDetector(
        onTap: _LoginController,//<---- THE ERROR IS HERE
        child: Text(
            'Registrate',
            style: TextStyle(
                fontWeight: FontWeight.bold,
                color: MyColors.primaryColor
            )
        ),
      )
    ],
  );
}

我的 controller：

import 'package:flutter/material.dart';

class LoginController {

  BuildContext? context;

  Future? init(BuildContext context){
    this.context = context;
  }

  void registerPageRedi(BuildContext context){
    Navigator.pushNamed(context, 'register');
  }
}

Answer 1

you cant define controller as the on tap method all you need to do is send the controller data to the function and perform the operation inside the function

Answer 2

試試看

GestureDetector(
  onTap: _LoginController.registerPageRedi(context),
  child: Text(
    'Registrate',
     style: TextStyle(
     fontWeight: FontWeight.bold,
     color: MyColors.primaryColor
   )
  ),
),

從方法中刪除 void

class LoginController {

  BuildContext? context;

  Future? init(BuildContext context){
    this.context = context;
  }

  registerPageRedi(BuildContext context){
    Navigator.pushNamed(context, 'register');
  }
}

Answer 3

我解決了它，我將 LoginController 的實例移出類，現在我可以在全局范圍內使用它，盡管我認為這有點奇怪，因為我試圖訪問同一個 class 中的實例並且實例仍然無法識別

LoginController _loginController = new LoginController(); //Instance out of classes
    
class LoginPage extends StatefulWidget {
    
}
    
class _LoginPageState extends State<LoginPage> {

}

感謝那些試圖幫助我的人：D