這裏最重要的就是定義@required this.onChangedui
class SonWidget extends StatefulWidget { SonWidget ({Key key,this.weibo,@required this.onChanged}):super(key:key); Map weibo; final ValueChanged<bool> onChanged; }
而後再父widget 中 調用子widgetthis
child:SonWidget( onChanged:(value){ } )