由于我是Flutter的新手,我为许多问题表示歉意。
我正试图从扑朔迷离的路由中发回数据(列表项索引),以从ListView中删除。但是,ListView不会更新。不知道我在做什么错。我缩短了一些代码,但是如果您需要更多代码,请告诉我。感谢您的帮助。
List clients;
Appointments({Key key, @required this.clients}): super(key: key);
@override
State<StatefulWidget> createState() {
return AppointmentState();
}
}
class AppointmentState extends State<Appointments> {
@override
Widget build (BuildContext context) {
return Container(
child: Expanded(
child: ListView.builder(
itemCount: widget.clients.length,
itemBuilder: (context, index) {
var client = widget.clients[index];
return Dismissible(
key: Key(client),
direction:DismissDirection.endToStart,
onDismissed: (direction) {
setState () {
widget.clients.removeAt(index);
}
},
background: Container(color: Colors.red),
child: ListTile(
title: Text(client),
leading: Icon(Icons.face),
trailing: Icon(Icons.keyboard_arrow_right),
onTap: () {
//list index, and index data (client)
_checkIfRemoved(context, index, client);
}
),
);...
_checkIfRemoved方法:
void _checkIfRemoved (BuildContext context, index, client) async {
final result = await Navigator.push(context, MaterialPageRoute(builder: (context) => Client(clientIndex: index, clientName: client)));
setState() {
widget.clients.removeAt(result);
}
print(result);
}
客户端屏幕
RaisedButton(
child: Text("Remove Client"),
color: Colors.red,
onPressed: () {
Navigator.pop(context, widget.clientIndex);
},
)
答案 0 :(得分:3)
您使用的setState
不正确
更改此:
setState() {
widget.clients.removeAt(result);
}
对此:
setState(() {
widget.clients.removeAt(result);
});