Flutter学习之TextField、Checkbox、CheckboxListTile，Radio、RadioListTile、Switch、学习

class _TextFieldDemoState extends State<TextFieldDemo> {
  final _userName = TextEditingController();

  var _isSelector = false;

  int _sex = 1;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('sss'),
      ),
      body: Container(
        child: Column(
          children: <Widget>[
            TextField(
              decoration: const InputDecoration(
                hintText: '用户名',
              ),
              controller: _userName,
            ),
            const SizedBox(
              height: 10,
            ),
            ElevatedButton(
                onPressed: () {
                  print(_userName.text);
                },
                child: const Text('点我')),
            Checkbox(
                value: _isSelector,
                onChanged: (v) {
                  setState(() {
                    _isSelector = v!;
                  });
                }),
            CheckboxListTile(
              value: _isSelector,
              secondary: Icon(Icons.help),
              onChanged: (v) {
                setState(() {
                  _isSelector = v!;
                });
              },
              title: Text('标题'),
              subtitle: Text('副标题'),
            ),
            Row(
              children: [
                Radio(
                    value: 1,
                    groupValue: _sex,
                    onChanged: (v) {
                      setState(() {
                        _sex = v as int;
                      });
                    }),
                Radio(
                    value: 2,
                    groupValue: _sex,
                    onChanged: (v) {
                      setState(() {
                        _sex = v as int;
                      });
                    }),

              ],

            ),
            RadioListTile(
                value: 1,
                groupValue: _sex,
                title: Text('321'),
                subtitle: Text('321'),
                onChanged: (v) {
                  setState(() {
                    _sex = v as int;
                  });
                }),
            RadioListTile(
                value: 2,
                groupValue: _sex,
                title: Text('123'),
                subtitle: Text('123'),
                onChanged: (v) {
                  setState(() {
                    _sex = v as int;
                  });
                }),
            Switch(
                value: _isSelector,
                onChanged: (v){
                  setState(() {
                    _isSelector = v;
                  });
                }
            ),
            SwitchListTile(
                value: _isSelector,
                title: Text('aaaa'),
                subtitle: Text('BBBB'),
                onChanged: (v){
                  setState(() {
                    _isSelector = v;
                  });
                }
            ),
            SwitchListTile(
                value: _isSelector,
                title: Text('CCCC'),
                subtitle: Text('DDDD'),
                onChanged: (v){
                  setState(() {
                    _isSelector = v;
                  });
                }
            ),
          ],
        ),
      ),
    );
  }
}