如何检测何时在Flutter中选择了TextField？

我想你在找

FocusNode

要收听焦点变化，您可以向添加一个列表器，

FocusNode

focusNode

TextField

例：

class TextFieldFocus extends StatefulWidget {  @override  _TextFieldFocusState createState() => new _TextFieldFocusState();}class _TextFieldFocusState extends State<TextFieldFocus> {  FocusNode _focus = new FocusNode();  TextEditingController _controller = new TextEditingController();  @override  void initState() {    super.initState();    _focus.addListener(_onFocusChange);  }  void _onFocusChange(){    debugPrint("Focus: "+_focus.hasFocus.toString());  }  @override  Widget build(BuildContext context) {    return new Container(      color: Colors.white,      child: new TextField(        focusNode: _focus,      ),    );  }}

该要点表示如何确保聚焦的节点在ui上可见。

希望能帮助到你！