假设我有这样的一段代码:
return FutureBuilder(
future: _loadingDeals,
builder: (BuildContext context, AsyncSnapshot snapshot) {
return RefreshIndicator(
onRefresh: _handleRefresh,
...
)
}
)
在_handleRefresh
方法中,我希望通过编程方式触发FutureBuilder
的重新运行。
这种情况下:
当用户下拉refreshIndicator
时,_handleRefresh
只需使FutureBuilder
重新运行即可。
编辑:
完整的代码段,不包括刷新部分。我已经切换到使用StreamBuilder
,那么refreshIndicator
部分将如何适应所有内容?
class DealList extends StatefulWidget {
@override
State<StatefulWidget> createState() => new _DealList();
}
class _DealList extends State<DealList> with AutomaticKeepAliveClientMixin {
// prevents refreshing of tab when switch to
// Why? https://dev59.com/9lUK5IYBdhLWcg3w0St1
bool get wantKeepAlive => true;
final RestDatasource api = new RestDatasource();
String token;
StreamController _dealsController;
@override
void initState() {
super.initState();
_dealsController = new StreamController();
_loadingDeals();
}
_loadingDeals() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
this.token = prefs.getString('token');
final res =
this.api.checkInterests(this.token).then((interestResponse) async {
_dealsController.add(interestResponse);
return interestResponse;
});
return res;
}
_handleRefresh(data) async {
SharedPreferences prefs = await SharedPreferences.getInstance();
final token = prefs.getString('token');
await this.api.checkInterests(token).then((interestResponse) {
_dealsController.add(interestResponse);
});
return null;
}
@override
Widget build(BuildContext context) {
super.build(context); // <-- this is with the wantKeepAlive thing
return StreamBuilder(
stream: _dealsController.stream,
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.hasError) {
...
}
if (snapshot.connectionState != ConnectionState.done) {
return Center(
child: CircularProgressIndicator(),
);
}
if (!snapshot.hasData &&
snapshot.connectionState == ConnectionState.done) {
return Text('No deals');
}
if (snapshot.hasData) {
return ListView.builder(
physics: const AlwaysScrollableScrollPhysics(),
itemCount: snapshot.data['deals'].length,
itemBuilder: (context, index) {
final Map deal = snapshot.data['deals'][index];
return ListTile(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DealsDetailPage(
dealDetail: deal,
),
),
);
},
title: Text(deal['name']),
subtitle: Text(deal['expires']),
);
},
),
}
},
);
}
}
setState
? - Jonah WilliamssetState
,但它无法正常工作。这可能是因为我正在使用with AutomaticKeepAliveClientMixin
,所以整个小部件不会在状态更改时重新构建。为什么?请参见此处: https://dev59.com/9lUK5IYBdhLWcg3w0St1 - KhoPhi