flutter 点击回车（return）键 禁止键盘下落

实现 onEditingComplete即可

flutter键盘 return 键回调 实现这个方法之后 点击键盘将不会下落

 new TextField(
                // textInputAction:TextInputAction.newline,
                onEditingComplete: (){

                  // FocusScope.of(context).requestFocus(_backNode);
                  // FocusScopeNode focusScopeNode = FocusScope.of(context);
                  // // if (!focusScopeNode.hasPrimaryFocus &&
                  // //     focusScopeNode.focusedChild != null) {
                  //   FocusManager.instance.primaryFocus!.unfocus();
                  // }
                  print('onEditingComplete11111');
                },
                onTap: () {
                  print("ohao ");
                },
// focusNode: _backNode,
                // onSubmitted: (String str) {
                //   //onSubmitted是用户提交而触发的回调{当用户点击提交按钮（输入法回车键）}
                //   print('最终手机号为:$str---------------');
                // },
                controller: _userPasswordController,
                keyboardType: TextInputType.multiline,
                decoration: new InputDecoration(
                    contentPadding: const EdgeInsets.all(10.0),
                    icon: new Icon(Icons.nature_people),
                    labelText: "请输入名字",
//                  hintText: "fdsfdss",
                    helperText: "注册名字"),
              ),