flutter - Flutter:访问另一个类/文件中的函数

Question

在以下设置中，我将如何允许fileb.dart访问reset中的函数filea.dart:
filea.dart:

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Test',
      theme: ThemeData(
        primaryColor: Colors.pink[200],
      ),
      home: MyHomePage(title: ''),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  MyHomePageState createState() => MyHomePageState();
}

class MyHomePageState extends State<MyHomePage>
{


  int testCount = 0;

  void test() {
    setState(() {
      testCount++;
    });
  }

fileb.dart

import 'package:flutter/material.dart';
import './filea.dart';

class Buttons extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Padding(
          padding: const EdgeInsets.only(bottom: 11.0, top: 20),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: <Widget>[
              FloatingActionButton(
                heroTag: "btn1",
                onPressed: () => MyHomePageState.test(),
                child: const Icon(Icons.cancel),
                splashColor: Colors.pink[900],
                backgroundColor: Colors.pink[200],
              ),
              ),
            ],
          ),
        ),
      ],
    );
  }
}

要进行这项工作，我需要更改什么？

Answer 1

除非它是static，否则不能在另一个类中调用该函数，并且该函数不应处理non-static / local的任何变量，否则它将通过错误进行处理。

调用函数的另一种方法是将其作为参数传递给页面。