技術標籤：flutter

Provider的原本作用是解耦，進行狀態管理，這裡使用最基礎的Provider進行這個作用的演示

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Material App Bar'),
        ),
        body: Home(),
      ),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Provider<String>(
      create: (_)=>'1',
      child: Center(
        child: ChildWidget(),
      ),
    );
  }
}

class ChildWidget extends StatelessWidget {//在這裡不用明確的把數值傳遞過來
  @override
  Widget build(BuildContext context) {
    var select = context.select<String,int>((value){//輸入，對應String,源自Provider提供的內容
      return int.parse(value);//輸出，對應int，具體參考Selector
    });
    return Text('獲取的內容:$select');
  }
}