我想按“获取日期”按钮获取当前日期,并显示在文本字段中,如下图所示,
可能吗?我怎样才能做到这一点 ?请在这里帮助新手。

flutter - 在Flutter中,我想通过按按钮获取当前日期并在Textfield中显示,该怎么办?-LMLPHP

class _Home2State extends State<Home2> {
  DateTime date;
  final amount = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'mytest1',
      home: Scaffold(
        body: Card(
          child: Column(
            children: <Widget>[
              TextField(
                decoration: InputDecoration(labelText: 'Amount'),
              ),
              Row(
                children: <Widget>[
                  Expanded(
                    child: TextField(
                      // onChanged: ???,
                      decoration: InputDecoration(labelText: 'Date'),
                    ),
                  ),
                  RaisedButton(
                    color: Colors.blue,
                    child: Text(
                      'Get Date',
                      style: TextStyle(color: Colors.white),
                    ),
                    onPressed: () => setState(
                      () {
                        date = new DateTime.now();
                        print(date);
                      },
                    ),
                  )
                ],
              )
            ],
          ),
        ),
      ),
    );
  }
}

我想按“获取日期”按钮获取当前日期,并显示在文本字段中,如下图所示,

最佳答案

首先,将 Controller 分配给所需的TextField,例如controller: amount

其次,在您的amount.text = '$date';中添加setState()

  DateTime date;
  final amount = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Card(
      child: Column(
        children: <Widget>[
          TextField(
            decoration: InputDecoration(labelText: 'Amount'),
          ),
          Row(
            children: <Widget>[
              Expanded(
                child: TextField(
                  controller: amount,
                  decoration: InputDecoration(labelText: 'Date'),
                ),
              ),
              RaisedButton(
                color: Colors.blue,
                child: Text(
                  'Get Date',
                  style: TextStyle(color: Colors.white),
                ),
                onPressed: () => setState(
                  () {
                    date = DateTime.now();
                    amount.text = '$date';
                  },
                ),
              )
            ],
          )
        ],
      ),
    );
  }

09-10 01:42
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