Flutter 父子组件传值

Posted 2022-04-02 wulinzi

Flutter 父子组件传值

一父传子：

父中：

void onButtonChange(val1,val2,val3)
  print(‘============================子向父传值OK了===============‘);
  print(val1);
  print(val2);
  print(val3);
  print(‘============================子向父传值OK了===============‘);

List list=[["A","A"],["X","S","W"],["H","I","O"]];

new ButtonsWidget(data3Two:list, callback: (val1,val2,val3) => onButtonChange(val1,val2,val3)),

子中：

class ButtonsWidget extends StatefulWidget 
  ButtonsWidget(Key key, this.data3Two, this.callback)
      :super(key: key);
  final callback;
  List data3Two;
  @override
  _ButtonsWidgetState createState() => new _ButtonsWidgetState();


class _ButtonsWidgetState extends State<ButtonsWidget> 
　　

@override
Widget build(BuildContext context) 
  return ViewBuild(
    Container(
      child: Column(
        children: <Widget>[
          //省略
　　　　　　　　Text(widget.data3Two[0][0])；   //拿值得方法

        ],
      ),
    )某工具.onTap(()
　　　　doPostAjax()
).padding()略
  );

void doPostAjax()
  widget.callback(_istypesA1,_istypesA2,_istypesA3);