Flutter 学习

flutter 数据传递与通信

2019-10-31  本文已影响0人  月未雪

flutter 数据传递与通信

1.页面传值(页面间跳转)

class GoodDetailPage extends StatefulWidget {

final String goodId;

GoodDetailPage({

Key key,

this.goodId,

}) : super(key: key);

@override

CourseDetailPageState createState() => CourseDetailPageState(goodId: goodId);

}

返回时,Future来获取新路由返回数据

路由传值:

Future pushNamed(BuildContext context, String routeName,{Object arguments})

var args=ModalRoute.of(context).settings.arguments

2.监听回调 (flutter dialog 与Widget 通信)

class PhotoPickerDialog extends Dialog {

final OnDialogClickListener onDialogClickListener;

PhotoPickerDialog(this.onDialogClickListener, {Key key}) : super(key: key);

@override

Widget build(BuildContext context) {

//TODO: implement build

          }

}

abstract class OnDialogClickListener {

void onPickImage();

void onTakePhoto();

void onCancel();

}

3. event_bus: ^1.0.1(登录后,界面状态的变化)

eventBus.fire(userInfo);

eventBus.on().listen((event) {

getUserInfo();

});

4.StreamController (接口数据成功,控制Widget的绘制)

httpUtil.getOpenClassDetail(openClassId).then((result) {

_streamController.add(result);

});

Widget _courseDetailWidget(BuildContext context) {

return new StreamBuilder(

stream: _streamController.stream,

builder:

(BuildContext context, AsyncSnapshot snapshot) {

if (snapshot != null && snapshot.data != null) {

entity = snapshot.data;

return Container();

} })

}

5.数据共享(InheritedWidget)

6.跨组件状态共享(Provider)

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