问题
In my application, I am using a stack and a container. Within the container i have a form and its fields. Below is my code
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
class Login extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: LoginUI(),
);
}
}
class LoginUI extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return LoginState();
}
}
class LoginState extends State<LoginUI> {
final _formKey = GlobalKey<FormState>();
@override
Widget build(BuildContext context) {
return Container(
height: double.infinity,
width: double.infinity,
child:
Stack(
fit: StackFit.loose,
children: <Widget>[
SafeArea(
child: Container(
margin: EdgeInsets.only(top: 25),
child: Image.asset("assets/images/login_image.png"),
),
),
Positioned(
top: 275,
child: Container(
height: 600,
width: MediaQuery.of(context).size.width,
decoration: new BoxDecoration(
color: Colors.white,
borderRadius: new BorderRadius.only(
topLeft: const Radius.circular(40.0),
topRight: const Radius.circular(40.0))),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Flexible(
child: Container(
margin:
EdgeInsets.only(top: 20, left: 10, right: 10),
child: Image.asset(
"assets/images/logo_2.png"),
),
)
],
),
Form(
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.only(
top: 40,
),
child: SizedBox(
width: MediaQuery.of(context).size.width * .90,
height: 36,
child: TextFormField(
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
}
return null;
},
decoration: InputDecoration(
filled: true,
fillColor: Colors.white,
contentPadding: const EdgeInsets.only(
top: 2, bottom: 2, left: 8),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(30.0),
),
hintText: "Phone",
),
),
)),
Container(
margin: EdgeInsets.only(
top: 15,
),
child: SizedBox(
height: 36,
width: MediaQuery.of(context).size.width * .90,
child: TextFormField(
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
}
return null;
},
decoration: InputDecoration(
filled: true,
fillColor: Colors.white,
contentPadding: const EdgeInsets.only(
top: 2, bottom: 2, left: 8),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(30.0),
),
hintText: "Password",
),
),
),
),
Align(
alignment: Alignment.bottomRight,
child: Container(
margin: EdgeInsets.only(
top: 1, left: 10, right: 10),
child: FlatButton(
onPressed: () {},
child: Text("Forgot Password?",
style: TextStyle(
fontFamily: 'Roboto-Medium',
fontSize: 14.0,
letterSpacing: 1.25,
color:
Color.fromRGBO(75, 56, 137, 80))),
)),
),
Container(
margin:
EdgeInsets.only(top: 1, left: 10, right: 10),
child: SizedBox(
width: MediaQuery.of(context).size.width * .90,
child: RaisedButton(
color: Color.fromRGBO(75, 56, 137, 80),
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius:
new BorderRadius.circular(18.0),
side: BorderSide(
color:
Color.fromRGBO(75, 56, 137, 80))),
child: Text(
"LOGIN",
style: Theme.of(context).textTheme.button,
),
onPressed: () {
if (_formKey.currentState.validate()) {
// If the form is valid, display a Snackbar.
Scaffold.of(context).showSnackBar(
SnackBar(
content:
Text('Processing Data')));
}
},
),
))
],
),
),
Container(
margin: EdgeInsets.only(top: 1, left: 10, right: 10),
child: FlatButton(
onPressed: () {},
child: RichText(
text: TextSpan(children: <TextSpan>[
TextSpan(
text: "Not a member yet? ",
style: TextStyle(fontFamily: 'Roboto-Regular', fontSize: 14.0, letterSpacing: 0.25, color:Color.fromRGBO(75, 56, 137, 80 )),
),
TextSpan(
text: "Create an Account",
style: TextStyle(decoration: TextDecoration.underline, fontFamily: 'Roboto-Regular', fontSize: 14.0, letterSpacing: 0.25, color:Color.fromRGBO(75, 56, 137, 80 ),
),)
]),
),
)),
],
),
),
),
],
)
//child: Image.asset("assets/images/login_image.png"),
);
}
Widget _buildForm() {
return Form(
key: _formKey,
child: Column(
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Flexible(
flex: 1,
child: Container(
child: ImageIcon(
AssetImage("assets/images/email_24px.png"),
color: Colors.white,
),
margin: EdgeInsets.only(right: 5, bottom: 30)),
),
Flexible(
flex: 7,
child: SizedBox(
height: 80,
child: TextFormField(
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
}
return null;
},
decoration: InputDecoration(
filled: true,
fillColor: Colors.white,
contentPadding:
const EdgeInsets.only(top: 2, bottom: 2, left: 8),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(30.0),
),
hintText: "Email",
),
),
))
],
),
Container(
margin: EdgeInsets.only(top: 20),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Flexible(
flex: 1,
child: Container(
child: ImageIcon(
AssetImage("assets/images/lock_24px.png"),
color: Colors.white,
),
margin: EdgeInsets.only(right: 5, bottom: 30),
),
),
Flexible(
flex: 7,
child: SizedBox(
height: 80,
child: TextFormField(
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
}
return null;
},
decoration: InputDecoration(
filled: true,
fillColor: Colors.white,
contentPadding:
const EdgeInsets.only(top: 2, bottom: 2, left: 8),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(30.0),
),
hintText: "Password",
),
),
))
],
),
),
Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
FlatButton(
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
child: Text(
"Forgot Password?",
style: Theme.of(context).textTheme.body1,
),
onPressed: () {},
),
],
),
),
Container(
margin: EdgeInsets.only(top: 40, left: 25, right: 10, bottom: 20),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Flexible(
child: SizedBox(
width: double.infinity,
height: 45,
child: RaisedButton(
color: Color.fromRGBO(0, 72, 128, 100),
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(18.0),
side:
BorderSide(color: Color.fromRGBO(0, 72, 128, 100))),
child: Text(
"LOGIN",
style: Theme.of(context).textTheme.button,
),
onPressed: () {
if (_formKey.currentState.validate()) {
// If the form is valid, display a Snackbar.
Scaffold.of(context).showSnackBar(
SnackBar(content: Text('Processing Data')));
}
},
),
))
],
),
)
],
),
);
}
@override
void initState() {
// TODO: implement initState
super.initState();
}
}
My view is as follows
when the keyboard is open, the user must close it to access the login button. This is because this cannot be scrolled. I tried adding SingleScrollView and ListView below the main image and wrap the rest with it, but that didnt work. It only made the content disappear.
How can i make sure the fORM section is scrollable?
回答1:
You can wrap your whole widget with SingleChildScrollView and then ConstrainedBox as follows:
Scaffold(
body: SingleChildScrollView(
child: ConstrainedBox(
constraints: BoxConstraints(maxHeight: MediaQuery.of(context).size.height),
child: Container(
child: yourWidget()
You can see the related answer here: https://stackoverflow.com/a/59783374/12709039
来源：https://stackoverflow.com/questions/60072434/flutter-unable-to-make-the-form-scroll-when-the-keyboard-is-open