Flutter 中一次只能选中一个复选框
我的应用程序中有一个 3 个复选框，它们是通过循环勾选框地图而形成的，在我的应用程序中，它允许选择多个复选框，但我不希望发生这种情况，一次只能选择一个，有什么办法在颤振中这样做。
下面是我的代码。
class _DashboardFilterState extends State<DashboardFilter> {
void showModalSheet() {
List<Map<String, Object>> tickbox;
timeData = [
{"id": "1", "displayId": "Daily"},
{"id": "2", "displayId": "Weekly"},
{"id": "3", "displayId": "Monthly"}
];
showModalBottomSheet<void>(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
context: context,
builder: (BuildContext context) {
return StatefulBuilder(
builder: (BuildContext context, StateSetter state) {
return createBox(context, timeData, state);
});
});
}
createBox(BuildContext context,List<Map<String, Object>> tickbox, StateSetter state) {
var tickboxdata = tickbox.map<Widget>((data) {
int id = data["id"];
var dispId = data["displayId"];
return buildTimeData(context, id, dispId, state);
}).toList();
return SingleChildScrollView(
child: LimitedBox(
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
// children: metrics,
children: <Widget>[
Container(
child: Column(
children: tickboxdata,
),
),
],
)),
);
}
Widget buildTimeData(
BuildContext context, var id, var disp, StateSetter state) {
return Container(
child: Column(mainAxisSize: MainAxisSize.min,
children: <Widget>[
CheckboxListTile(
value: widget.timeSelected[id],
title: Text(disp),
controlAffinity: ListTileControlAffinity.leading,
onChanged: (bool val) {
manageTimeState(val, id, state);
})
]));
}
void manageTimeState(bool val, var id, StateSetter state) {
state(() {
widget.timeSelected[id] = val;
});
}
让我知道是否还有其他选择，谢谢
没有任何包我做的例子（空安全）
输出 ：-
示例代码：-
import 'package:flutter/material.dart';
class CheckBoxExample extends StatefulWidget {
const CheckBoxExample({Key? key}) : super(key: key);
@override
State<CheckBoxExample> createState() => _CheckBoxExampleState();
}
class _CheckBoxExampleState extends State<CheckBoxExample> {
String selected = "";
List checkListItems = [
{
"id": 0,
"value": false,
"title": "Sunday",
},
{
"id": 1,
"value": false,
"title": "Monday",
},
{
"id": 2,
"value": false,
"title": "Tuesday",
},
{
"id": 3,
"value": false,
"title": "Wednesday",
},
{
"id": 4,
"value": false,
"title": "Thursday",
},
{
"id": 5,
"value": false,
"title": "Friday",
},
{
"id": 6,
"value": false,
"title": "Saturday",
},
];
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Padding(
padding: const EdgeInsets.symmetric(horizontal: 24.0, vertical: 64.0),
child: Column(
children: [
Column(
children: List.generate(
checkListItems.length,
(index) => CheckboxListTile(
controlAffinity: ListTileControlAffinity.leading,
contentPadding: EdgeInsets.zero,
dense: true,
title: Text(
checkListItems[index]["title"],
style: const TextStyle(
fontSize: 16.0,
color: Colors.black,
),
),
value: checkListItems[index]["value"],
onChanged: (value) {
setState(() {
for (var element in checkListItems) {
element["value"] = false;
}
checkListItems[index]["value"] = value;
selected =
"${checkListItems[index]["id"]}, ${checkListItems[index]["title"]}, ${checkListItems[index]["value"]}";
});
},
),
),
),
const SizedBox(height: 100.0),
Text(
selected,
style: const TextStyle(
fontSize: 22.0,
color: Colors.black,
fontWeight: FontWeight.bold,
),
),
],
),
),
);
}
}
请使用包https://pub.dev/packages/grouped_buttons
在 onSelected 中，如果选择了多个项目，则删除第一个选择的项目
代码片段
List<String> _checked = [];
...
CheckboxGroup(
labels: <String>[
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
],
disabled: ["Wednesday", "Friday"],
checked: _checked,
onChange: (bool isChecked, String label, int index) =>
print("isChecked: $isChecked label: $label index: $index"),
onSelected: (List selected) => setState(() {
if (selected.length > 1) {
selected.removeAt(0);
print('selected length ${selected.length}');
} else {
print("only one");
}
_checked = selected;
}),
),
完整代码
/*
Name: Akshath Jain
Date: 3/15/19
Purpose: example app for the grouped buttons package
*/
import 'package:flutter/material.dart';
import 'package:grouped_buttons/grouped_buttons.dart';
void main() => runApp(GroupedButtonExample());
class GroupedButtonExample extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Grouped Buttons Example',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: HomePage(),
);
}
}
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
List<String> _checked = []; //["A", "B"];
String _picked = "Two";
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Grouped Buttons Example"),
),
body: _body(),
);
//
}
Widget _body() {
return ListView(children: <Widget>[
//--------------------
//SIMPLE USAGE EXAMPLE
//--------------------
//BASIC CHECKBOXGROUP
Container(
padding: const EdgeInsets.only(left: 14.0, top: 14.0),
child: Text(
"Basic CheckboxGroup",
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
),
),
CheckboxGroup(
labels: <String>[
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
],
disabled: ["Wednesday", "Friday"],
checked: _checked,
onChange: (bool isChecked, String label, int index) =>
print("isChecked: $isChecked label: $label index: $index"),
onSelected: (List selected) => setState(() {
if (selected.length > 1) {
selected.removeAt(0);
print('selected length ${selected.length}');
} else {
print("only one");
}
_checked = selected;
}),
),
//BASIC RADIOBUTTONGROUP
Container(
padding: const EdgeInsets.only(left: 14.0, top: 14.0),
child: Text(
"Basic RadioButtonGroup",
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
),
),
RadioButtonGroup(
labels: [
"Option 1",
"Option 2",
],
disabled: ["Option 1"],
onChange: (String label, int index) =>
print("label: $label index: $index"),
onSelected: (String label) => print(label),
),
//--------------------
//CUSTOM USAGE EXAMPLE
//--------------------
///CUSTOM CHECKBOX GROUP
Container(
padding: const EdgeInsets.only(left: 14.0, top: 14.0, bottom: 14.0),
child: Text(
"Custom CheckboxGroup",
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
),
),
CheckboxGroup(
orientation: GroupedButtonsOrientation.HORIZONTAL,
margin: const EdgeInsets.only(left: 12.0),
onSelected: (List selected) => setState(() {
_checked = selected;
}),
labels: <String>[
"A",
"B",
],
checked: _checked,
itemBuilder: (Checkbox cb, Text txt, int i) {
return Column(
children: <Widget>[
Icon(Icons.polymer),
cb,
txt,
],
);
},
),
///CUSTOM RADIOBUTTON GROUP
Container(
padding: const EdgeInsets.only(left: 14.0, top: 14.0, bottom: 14.0),
child: Text(
"Custom RadioButtonGroup",
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
),
),
RadioButtonGroup(
orientation: GroupedButtonsOrientation.HORIZONTAL,
margin: const EdgeInsets.only(left: 12.0),
onSelected: (String selected) => setState(() {
_picked = selected;
}),
labels: <String>[
"One",
"Two",
],
picked: _picked,
itemBuilder: (Radio rb, Text txt, int i) {
return Column(
children: <Widget>[
Icon(Icons.public),
rb,
txt,
],
);
},
),
]);
}
}
工作演示
