有没有办法保持键盘焦点？

问题描述

我有一个TextField小部件，可以在列表中添加播放器。但是我希望键盘在添加播放器时保持焦点，并且在提交时，键盘保持焦点松散。.有什么想法吗？

这是我的TextField小部件：

TextField(
          textCapitalization: TextCapitalization.words,onChanged: (val) => playerName = val.trim(),onSubmitted: (val) {
            if (playerName != null && playerName != '') {
              Provider.of<PlayerProvider>(context,listen: false).addplayer(playerName);
              HapticFeedback.lightImpact();
            }
          },maxLength: 19,autocorrect: false,decoration: new Inputdecoration(
              counterText: "",border: new OutlineInputBorder(
                borderSide: BorderSide.none,borderRadius: const BorderRadius.all(
                  const Radius.circular(30.0),),filled: true,contentPadding: EdgeInsets.symmetric(vertical: 0,horizontal: 20),hintStyle: GoogleFonts.rubik(color: Colors.grey[500],fontWeight: FontWeight.bold),hintText: AppLocalizations.of(context).translate('player_selection_page_hint'),fillColor: Colors.white),)

顺便说一句，autofocus: true可以工作，但是有点像键盘没有对准焦点，并且可以立即将焦点移回……所以观看起来并不好。所以，如果您还有其他想法。

解决方法

我认为您应该尝试使用FocusNode。

class MyCustomForm extends StatefulWidget {
  @override
  _MyCustomFormState createState() => _MyCustomFormState();
}

// Define a corresponding State class.
// This class holds data related to the form.
class _MyCustomFormState extends State<MyCustomForm> {
  // Define the focus node. To manage the lifecycle,create the FocusNode in
  // the initState method,and clean it up in the dispose method.
  FocusNode myFocusNode;

  @override
  void initState() {
    super.initState();

    myFocusNode = FocusNode();
  }

  @override
  void dispose() {
    // Clean up the focus node when the Form is disposed.
    myFocusNode.dispose();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return TextField(
          focusNode: myFocusNode
          textCapitalization: TextCapitalization.words,onChanged: (val) => playerName = val.trim(),onSubmitted: (val) {
            if (playerName != null && playerName != '') {
              Provider.of<PlayerProvider>(context,listen: false).addPlayer(playerName);
              HapticFeedback.lightImpact();
            }
            myFocusNode.requestFocus();
          },maxLength: 19,autocorrect: false,decoration: new InputDecoration(
              counterText: "",border: new OutlineInputBorder(
                borderSide: BorderSide.none,borderRadius: const BorderRadius.all(
                  const Radius.circular(30.0),),filled: true,contentPadding: EdgeInsets.symmetric(vertical: 0,horizontal: 20),hintStyle: GoogleFonts.rubik(color: Colors.grey[500],fontWeight: FontWeight.bold),hintText: AppLocalizations.of(context).translate('player_selection_page_hint'),fillColor: Colors.white),);
  }
}

好吧，您可以使用FocusNode。但是我有一个解决方法。我通常设置 .container { height: 100px } .container .is-active { height: 200px; 并且在验证器中总是返回一些文本。因此，每当用户单击文本字段时，它都不会失去焦点。因此，颤动始终使焦点集中在文本字段上。但是，为此，您必须使用TextFormField。

但是正确的方法是使用FocusNode。这是代码。

autovalidate:true

然后您可以使用它来调用onSaved方法

TextFormField (
autovalidate : true
              validator: (value) {
                return '';
              },textCapitalization: TextCapitalization.words,onSaved: (val) {
               

             if (playerName != null && playerName != '') {
               Provider.of<PlayerProvider>(context,listen: false).addPlayer(playerName);
                HapticFeedback.lightImpact();
              }
              },decoration: new InputDecoration(
                  counterText: "",border: new OutlineInputBorder(
                    borderSide: BorderSide.none,borderRadius: const BorderRadius.all(
                      const Radius.circular(30.0),errorBorder: OutlineInputBorder(
                    borderSide: BorderSide.none,focusedErrorBorder: OutlineInputBorder(
                    borderSide: BorderSide.none,)

此处_formKey

_formKey.currentState.save(); // And it will call the onSaved method

包装出现文本框的整个小部件树。

keyboard textfield