颤动- TextEditingController不工作
颤动- TextEditingController不工作
提问于 2021-10-12 14:31:19
我尝试从4个TextFields (商品编码、商品名称、商品单位、商品数量)中获取数据，并将它们传递到我的数据库中。但它根本不起作用。我是编程新手，Flutter是我的第二语言。
下面是我的代码：
class _AddItemPageState extends State<AddItemPage> {
final textController = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
title: const Text("Add Item",
style: TextStyle(
color: Colors.white,
fontFamily: "Quicksand",
fontWeight: FontWeight.bold)),
centerTitle: true,
backgroundColor: Colors.green,
),
body: SingleChildScrollView(
child: Container(
padding: EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
TextField(
controller: textController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
TextField(
controller: textController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
TextField(
controller: textController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
TextField(
controller: textController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
ElevatedButton.icon(
onPressed: () async {
final Map<String, String> data = ({
'code': textController.text,
'name': textController.text,
'unit': textController.text,
'quantity': textController.text,
});
// API
},
icon: Icon(Icons.add),
style: ButtonStyle(
padding: MaterialStateProperty.all(
EdgeInsets.fromLTRB(0, 16, 0, 16)),
backgroundColor:
MaterialStateProperty.all<Color>(Colors.green)),
label: Text(
"Add Item",
style: TextStyle(fontFamily: "Quicksand", fontSize: 16),
))
],
),
),
));
}
}我已经找了一天了，但还是没有找到任何东西。任何帮助都将不胜感激。谢谢！
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-10-12 14:34:31
TextEditingController只能用于一个TextField。因此，您应该使用4个TextEditingController，而不是对4个文本字段使用textController。
我更新了你的代码：
class _AddItemPageState extends State<AddItemPage> {
final firstController = TextEditingController();
final secondController = TextEditingController();
final thirdController = TextEditingController();
final fourthController = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
title: const Text("Add Item",
style: TextStyle(
color: Colors.white,
fontFamily: "Quicksand",
fontWeight: FontWeight.bold)),
centerTitle: true,
backgroundColor: Colors.green,
),
body: SingleChildScrollView(
child: Container(
padding: EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
TextField(
controller: firstController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
TextField(
controller: secondController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
TextField(
controller: thirdController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
TextField(
controller: fourthController,
style: TextStyle(fontFamily: "Quicksand", fontSize: 18),
),
const SizedBox(
height: 8,
),
ElevatedButton.icon(
onPressed: () async {
final Map<String, String> data = ({
'code': textController.text,
'name': textController.text,
'unit': textController.text,
'quantity': textController.text,
});
// API
},
icon: Icon(Icons.add),
style: ButtonStyle(
padding: MaterialStateProperty.all(
EdgeInsets.fromLTRB(0, 16, 0, 16)),
backgroundColor:
MaterialStateProperty.all<Color>(Colors.green)),
label: Text(
"Add Item",
style: TextStyle(fontFamily: "Quicksand", fontSize: 16),
))
],
),
),
));
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69542372
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