flutter - 如何从其他 StatefulWidget 更新 StatefulWidget？

Question

我的屏幕上有 3 个标签。都有不同的看法。当用户来到屏幕上时，我必须点击 API 并更新所有 3 个选项卡的 View 。我无法更新选项卡内的 View 。获取 API 响应后无法更新不同选项卡的状态。

Error

Error-> NoSuchMethodError: The method 'updateInfo' was called on null.
I/flutter ( 7515): Receiver: null
I/flutter ( 7515): Tried calling: updateInfo(Instance of 'OwnerInfo')

屏幕 View 如下:

DetailItem

class DetailItem extends StatefulWidget {
  PropertyItem _propertyObj;
  OwnerInfo _ownerInfo;
  Review _reviewInfo;

  @override
  _DetailItemState createState() => _DetailItemState();
}

class _DetailItemState extends State<DetailItem> with TickerProviderStateMixin {
  ScrollController _scrollController = new ScrollController();
  double _appBarHeight = 0.0;
  TabController _tabController;

  final GlobalKey<AddressViewTabState> key =
      new GlobalKey<AddressViewTabState>();

  //Tabs used in Detail Screen
  DetailViewTab _detailViewTab;
  AddressViewTab _addressViewTab;
  ReviewTab _reviewTab;

  @override
  void initState() {
    _tabController = TabController(length: 3, vsync: this, initialIndex: 0); // initialize tab controller
    //Initialize Tabs
    _detailViewTab = DetailViewTab(widget._propertyObj);
    _addressViewTab = AddressViewTab(key: key, propertyDetailModel: widget._ownerInfo);
    _reviewTab = ReviewTab(widget._propertyObj);

    _hitDetailAPI(); //init state Hit API
    super.initState();
  }

  //Detail API
  void _hitDetailAPI() async {
    Future<PropertyDetailModel> obj = APIHandler()
        .getPropertyDetail(widget._propertyObj.getRoomId.toString());
    obj.then((response) {
      if (!mounted) {
        return;
      }
      //update data in set state
      setState(() {
        if (response != null && response.getPropertyItem != null) {
          widget._propertyObj = response.getPropertyItem; // update data to property object the 1st tab(Detail)
          widget._ownerInfo = response.getOwnerInfo; // update data to owner info object the second tab (Address)
          key.currentState.updateInfo(widget._ownerInfo); // Tried to update the address tab view by calling through key current state.
        }
      });
    }).catchError((error) {
      print("Error-> " + error.toString());
    });
  }

AddressViewTab

class AddressViewTab extends StatefulWidget {
  OwnerInfo ownerInfo = OwnerInfo();
  AddressViewTab({ Key key , @required this.ownerInfo}) : super(key: key);

  @override
  AddressViewTabState createState() => AddressViewTabState();

}

class AddressViewTabState extends State<AddressViewTab>{

  updateInfo(OwnerInfo ownerInfo){
    print("Update method called");
    if (!mounted) {
      return;
    }
    setState(() {
      widget.ownerInfo=ownerInfo; // update state 
    });
  }

  @override
  Widget build(BuildContext context) {
      return Container(
          alignment: Alignment.center,
          child: ListView(
            children: <Widget>[
              getOwnerInfoCard(widget.ownerInfo),
            ],
          ),
        );
  }

}

如有任何帮助，我们将不胜感激。提前致谢。

Answer 1

您可以使用 Redux 的 flutter 实现来处理这样的事情 https://pub.dartlang.org/packages/flutter_redux为此。

简而言之，这可以使“任何”小部件在某些数据更改时自行更新。