Flutter 数据和状态共享 管理类provider使用小记（自用）EventBus使用

一 、数据共享provider

https://pub.dev/packages/provider/example

1、集成lib
provider: ^4.3.2+2

2、在mian方法中声明：

import 'package:provider/provider.dart';

/// This is a reimplementation of the default Flutter application using provider + [ChangeNotifier].

void main() {
  runApp(
    /// Providers are above [MyApp] instead of inside it, so that tests
    /// can use [MyApp] while mocking the providers
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => Counter()),
      ],
      child: MyApp(),
    ),
  );
}

3、创建类继承ChangeNotifier，写属性

class Counter with ChangeNotifier {
  int _count = 0;
  int get count => _count;

  void increment() {
    _count++;
    notifyListeners();
  }

4、方法使用： context.read<Counter>().increment(),

 属性读取： '${context.watch<Counter>().count}',

 

二、事件广播，可进行Ui操作  EventBus使用

1、引入lib

event_bus: ^1.1.1

2、写一个类。

import 'package:event_bus/event_bus.dart';

import 'package:event_bus/event_bus.dart';


EventBus eventBus = EventBus();

//商品详情广播数据
class ProductContentEvent {
  String str;

  ProductContentEvent(String str){
    this.str = str;
  }
  
}

class UserEvent {
  String str;
  UserEvent(String str){
    this.str = str;
  }
}

//增加地址成功事件
class AddressEvent {
  String str;
  AddressEvent(String str){
    this.str = str;
  }
}

3、事件监听

  @override
  void initState() {
    // TODO: implement initState
    super.initState();

    this._getAddressList();

    //监听增加收货地地成功
    eventBus.on<AddressEvent>().listen((event) {
      this._getAddressList();
    });

  }

4、事件广播

 eventBus.fire(new AddressEvent("增加成功"));