我想知道如何将我的函数userUid()传递给StreamBuilder {
FirebaseAuth auth = FirebaseAuth.instance;
userUid() async {
final FirebaseUser user = await auth.currentUser;
final uid = user.uid;
return uid;
}
final tabs = [
final documentId = await userUid();
Center(
child: (Scaffold(
body: StreamBuilder (
stream: FirebaseFirestore.instance.collection('users').document(userUid()).snapshots(),
builder: (context, snapshot) {
if (snapshot.data == null) return CircularProgressIndicator();
return Container(
padding: EdgeInsets.all(16),
child: ListView.builder(
final documentId = await useruid();中传递函数final tabs =[时我收到错误
error: Expected an identifier. (missing_identifier at lib/pages/home.dart:39)error: Expected to find ']'. (expected_token at lib/pages/home.dart:39)idk我可以做些什么来传递此功能...与某人知道示例文件，以便我可以研究如何做，
完整代码:
final tabs = [
final documentId = await userUid();
Center(
child: (Scaffold(
body: StreamBuilder (
stream: FirebaseFirestore.instance.collection('users').document(userUid()).snapshots(),
builder: (context, snapshot) {
if (snapshot.data == null) return CircularProgressIndicator();
return Container(
padding: EdgeInsets.all(16),
child: ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot manuais =
snapshot.data.documents[index];
return Card(
color: Colors.grey[250],
child: Container(
padding: EdgeInsets.all(10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
new Image.asset('Images/pdflogo.png', width: 32,
),
Center(
child: Text(
(manuais.data()['nome'].toString()),
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(fontSize: 16),
),
),
ButtonBar(
children: <Widget>[
FlatButton(
child: const Text('Compartilhar / Download'),
onPressed: () async {
var request = await HttpClient().getUrl(Uri.parse(manuais.data()['documento']));
var response = await request.close();Uint8List bytes = await consolidateHttpClientResponseBytes(response);
await Share.file(
'ESYS AMLOG',
'Manual.pdf',
bytes,
'image/jpg');
}),
],
),
],
),
),
);
}),
);
})))),
Center(
child: (Scaffold(
body: StreamBuilder(
stream: FirebaseFirestore.instance.collection('producao').snapshots(),
builder: (context, snapshot) {
if (snapshot.data == null) return CircularProgressIndicator();
return Container(
padding: EdgeInsets.all(16),
child: ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot producao =
snapshot.data.documents[index];
return Card(
color: Colors.grey[250],
child: Container(
padding: EdgeInsets.all(10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Center(
child: Image.network(producao.data()['img'].toString(), width: 260,
),
),
Text(
(producao.data()['data'].toString()),
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(fontSize: 22),
),
Text(
(producao.data()['detail'].toString()),
style: TextStyle(fontSize: 16),
),
ButtonBar(
children: <Widget>[
FlatButton(
child: const Text('DETALHES'),
onPressed: () {
ImageViewer.showImageSlider(
images: [
(producao.data()['img']),
//List of images' URLs
],
);
}),
FlatButton(
child: const Text('COMPARTILHAR'),
onPressed: () async {
var request = await HttpClient().getUrl(Uri.parse(producao.data()['img']));
var response = await request.close();Uint8List bytes = await consolidateHttpClientResponseBytes(response);
await Share.file(
'ESYS AMLOG',
'amlog.jpg',
bytes,
'image/jpg'
);
}),
],
),
],
),
),
);
}),
);
})))),
Center(child: Text('Documentos')),
]; //<<<<<<<<<<<<<<< here closes the tab
````
最佳答案
您不能在List内定义变量。您可以做两件事:
documentId实例化之前声明List:final documentId = await userUid();
final tabs = [
...
];
/// ... simulates the parameters of the function
List<Widget> getWidgetList(...) async {
final documentId = await userUid();
final List<Widget> list = [];
// To insert in a final list use the method add(...)
...
// Do your logic here
...
return list;
}
final tabs = getWidgetList(...);
关于firebase - 如何将它从userUid()获取到StreamBuilder Flutter，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63942950/