TextField
文本输入框，类似Android中的EditText
TextField(cursorColor: Colors.blue,cursorHeight: 15,cursorRadius: Radius.circular(10),cursorWidth: 2,showCursor: true,controller: _controller,focusNode: _focusNode,obscuringCharacter: "-",obscureText: true,decoration: InputDecoration(isCollapsed: false,labelText: "Label",helperText: "Helper",counterText: "",contentPadding: EdgeInsets.all(0),focusedBorder: OutlineInputBorder(borderSide: BorderSide(color: Colors.blue)),border: OutlineInputBorder(borderSide: BorderSide(color: Colors.red))),onSubmitted: (str) {print('_TextFieldViewState.buildView--$str');},textInputAction: TextInputAction.search,onChanged: (content) {print('_TextFieldViewState.buildView-changed:$content');},)
光标-cursor
文本控制器-controller
通过controller可以获取输入框的内容*_controller.text*，清除输入框内容*_controller.clear()*等
TextEditingController _controller = TextEditingController();
焦点变化-focusNode
通过设置TextField的focusNode，
FocusNode _focusNode = FocusNode();
并调用unfocus和requestFoucs来使其失去或获取焦点
if (_focusNode.hasFocus) {_focusNode.unfocus();} else {_focusNode.requestFocus();}
内容是否可见-obscureText
类似密码那种，可以自定义默认显示的字符串
obscureText：true：不可见，false：可见
obscuringCharacter：不可见时，占位符号
TextField(obscuringCharacter: "-",obscureText: true,)
键盘操作按钮-textInputAction
设置键盘右下角的操作按钮，介绍常见的几个
键盘操作按钮点击时间-onSubmitted
这个即是上方操作按钮点击时的回调
输入内容时的回调-onChanged
ValueChanged<String>? onChanged
文本修饰符-InputDecoration
介绍InputDecoration常用的几个属性
