。Aja*_*mar 17
干得好！showDialog使用WidgetBuilder作为参数，因此您可以返回任何小部件。
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(home: new MyApp()));
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
final _formKey = GlobalKey<FormState>();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Flutter"),
),
body: Center(
child: RaisedButton(
onPressed: () {
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
content: Form(
key: _formKey,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Padding(
padding: EdgeInsets.all(8.0),
child: TextFormField(),
),
Padding(
padding: EdgeInsets.all(8.0),
child: TextFormField(),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: RaisedButton(
child: Text("Submitß"),
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
}
},
),
)
],
),
),
);
});
},
child: Text("Open Popup"),
),
),
);
}
}
希望对您有帮助！
- @Amit 来自文档：当前具有此全局键的树中小部件的状态。如果 (1) 树中没有与此全局键匹配的小部件，(2) 该小部件不是 StatefulWidget，或者关联的 State 对象不是 T 的子类型，则当前状态为 null。 (2认同)
Kab*_*uda 16
下面是一个代码示例，它允许您创建一个可以生成此类弹出窗口的按钮。
代码：
RaisedButton(
child: Text("Open Popup"),
onPressed: () {
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
scrollable: true,
title: Text('Login'),
content: Padding(
padding: const EdgeInsets.all(8.0),
child: Form(
child: Column(
children: <Widget>[
TextFormField(
decoration: InputDecoration(
labelText: 'Name',
icon: Icon(Icons.account_box),
),
),
TextFormField(
decoration: InputDecoration(
labelText: 'Email',
icon: Icon(Icons.email),
),
),
TextFormField(
decoration: InputDecoration(
labelText: 'Message',
icon: Icon(Icons.message ),
),
),
],
),
),
),
actions: [
ElevatedButton(
child: Text("Submit"),
onPressed: () {
// your code
})
],
);
});
},
),
输出 ：
要获得更多选项，您必须操作 Form 小部件、TextField 小部件或 RaisingButton 小部件的属性，例如自动验证、装饰、颜色等...如果这还不够，您可以使用 Dialog 小部件而不是AlertDialog小部件。但在这种情况下，您将用 child 替换 content 属性。并进行必要的修改。
屏幕截图（没有任何第三方软件包）：
代码：只需调用这个方法：
void showDialogWithFields() {
showDialog(
context: context,
builder: (_) {
var emailController = TextEditingController();
var messageController = TextEditingController();
return AlertDialog(
title: Text('Contact Us'),
content: ListView(
shrinkWrap: true,
children: [
TextFormField(
controller: emailController,
decoration: InputDecoration(hintText: 'Email'),
),
TextFormField(
controller: messageController,
decoration: InputDecoration(hintText: 'Message'),
),
],
),
actions: [
TextButton(
onPressed: () => Navigator.pop(context),
child: Text('Cancel'),
),
TextButton(
onPressed: () {
// Send them to your email maybe?
var email = emailController.text;
var message = messageController.text;
Navigator.pop(context);
},
child: Text('Send'),
),
],
);
},
);
}
使用 rflutter_alert 插件 rflutter_alert
您必须将该库作为依赖项添加到您的项目中。
dependencies:
rflutter_alert: ^1.0.3
要打开一个弹出窗口，让我们成为一个函数并执行以下操作：
_openPopup(context) {
Alert(
context: context,
title: "LOGIN",
content: Column(
children: <Widget>[
TextField(
decoration: InputDecoration(
icon: Icon(Icons.account_circle),
labelText: 'Username',
),
),
TextField(
obscureText: true,
decoration: InputDecoration(
icon: Icon(Icons.lock),
labelText: 'Password',
),
),
],
),
buttons: [
DialogButton(
onPressed: () => Navigator.pop(context),
child: Text(
"LOGIN",
style: TextStyle(color: Colors.white, fontSize: 20),
),
)
]).show();
}
并这样称呼它
onPressed: () {
_openPopup(context),
}
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
contentPadding: EdgeInsets.zero,
content: Stack(
overflow: Overflow.visible,
children: <Widget>[
Positioned(
right: -15.0,
top: -15.0,
child: InkResponse(
onTap: () {
Navigator.of(context).pop();
},
child: CircleAvatar(
radius: 12,
child: Icon(Icons.close, size: 18,),
backgroundColor: Colors.red,
),
),
),
Form(
key: _formKey,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
height: 60,
width: MediaQuery.of(context).size.width,
decoration: BoxDecoration(
color:Colors.yellow.withOpacity(0.2),
border: Border(
bottom: BorderSide(color: Colors.grey.withOpacity(0.3))
)
),
child: Center(child: Text("Contact Me", style:TextStyle(color: Colors.black54, fontWeight: FontWeight.w700, fontSize: 20, fontStyle: FontStyle.italic, fontFamily: "Helvetica"))),
),
Padding(
padding: EdgeInsets.all(20.0),
child: Container(
height: 50,
decoration: BoxDecoration(
border: Border.all(color: Colors.grey.withOpacity(0.2) )
),
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Expanded(
flex:1,
child: Container(
width: 30,
child: Center(child: Icon(Icons.person, size: 35,color:Colors.grey.withOpacity(0.4))),
decoration: BoxDecoration(
border: Border(
right: BorderSide(color: Colors.grey.withOpacity(0.2))
)
),
),
),
Expanded(
flex: 4,
child: TextFormField(
decoration: InputDecoration(
hintText: "Name",
contentPadding: EdgeInsets.only(left:20),
border: InputBorder.none,
focusedBorder: InputBorder.none,
errorBorder: InputBorder.none,
hintStyle: TextStyle(color:Colors.black26, fontSize: 18, fontWeight: FontWeight.w500 )
),
),
)
],
)
),
),
Padding(
padding: const EdgeInsets.all(20.0),
child: RaisedButton(
padding: EdgeInsets.zero,
child: Container(
width:MediaQuery.of(context).size.width,
height: 60,
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors: [
Color(0xffc9880b),
Color(0xfff77f00),
]
)
),
child: Center(child: Text("Submit", style: TextStyle(color:Colors.white70, fontSize: 20, fontWeight: FontWeight.w800),)),
),
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
}
},
),
)
],
),
),
],
),
);
});
我尝试了上面的所有答案，但它说没有实质性的小部件错误。然后我在图标按钮的位置尝试这个，你可以使用任何小部件，但你也必须使用脚手架背景颜色作为透明和后退或取消按钮
onTap: () {
showDialog(
context: context,
builder: (BuildContext context) {
return Scaffold(
backgroundColor: Colors.transparent,
body: IconButton(
icon: Icon(Icons.ac_unit),
onPressed: () {
Navigator.pop(context);
},
),
);
},
);
},
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