首先引用 FocusNode()

FocusNode focusNode = FocusNode();

然后在输入框组件中调用即可

TextField(controller: _textController,textAlign: TextAlign.start,focusNode: focusNode,onTapOutside: (e) => {focusNode.unfocus()},onEditingComplete: () {FocusScope.of(context).requestFocus(focusNode);},decoration: InputDecoration(contentPadding:const EdgeInsets.symmetric(horizontal: 0),hintText: hitText,hintStyle: const TextStyle(color: Colors.grey),focusedBorder: const UnderlineInputBorder(borderSide: BorderSide(color: Colors.grey),borderRadius: BorderRadius.horizontal(),),),cursorColor: Colors.white,style: greyTextStyle,onChanged: (value) {setState(() {titleValue = value;});},autofocus: false,),

下方的代码就是起到点击输入框之外的区域，进行失焦，收起键盘的作用

onTapOutside: (e) => {focusNode.unfocus()},onEditingComplete: () {FocusScope.of(context).requestFocus(focusNode);},