FLutter TextField焦点监听

监听TextField 焦点

FocusNode _focusNode = FocusNode();

  @override
  void initState() {
    _focusNode.addListener(() {
     if (_focusNode.hasFocus) {//有焦点
      }else{ //失去焦点
      }
    });
    super.initState();
  }

设置 TextField 属性

TextField(
  focusNode: _focusNode,)