在Flutter中将焦点带到TextField

Question

自从过去几天我一直在学习颤抖,我在开发应用程序时遇到了问题.所以我有一个包含所有基本输入字段的基本表单,用户点击提交按钮后,应用程序检查文本字段的有效性.如果输入错误,应用会将焦点移回文本字段.如何将焦点移回文本字段

Answer 1

var focusNode = new FocusNode();
var textField = new TextField(focusNode: focusNode);

FocusScope.of(context).requestFocus(focusNode);

另请参见https://docs.flutter.io/flutter/widgets/FocusNode-class.html

Answer 2

用

FocusScope.of(context).previousFocus();

Column(
  children: [
    TextField(...), // 1st TextField
    TextField(...), // 2nd TextField
    RaisedButton(
      onPressed: () => FocusScope.of(context).previousFocus(), // This is what you need
      child: Text("Go back"),
    ),
  ],
)

Answer 3

 TextField(
      autofocus: true,
);