Flutter 当我在TextFormField内点击Sufficion时，防止TextFormField聚焦

当我按下按钮时，TextFormField将聚焦，键盘将出现。如何解决此问题？
代码如下：

TextFormField(
              controller: code,
              focusNode: codeFocus,
              decoration: InputDecoration(
                labelText: 'verify code',
                prefixIcon: Icon(Icons.sms),
                suffixIcon: FlatButton(
                  onPressed:(){}
                  child: Text('send sms'),
                  textTheme: ButtonTextTheme.primary,
                ),
              ),
              keyboardType: TextInputType.number,
            ),
            focusNode: codeFocus,
          )

---

您可以像这样使用堆栈

Stack(
  alignment: Alignment.centerRight,
  children: <Widget>[
    TextFormField(
      decoration: InputDecoration(
        labelText: 'verify code',
        prefixIcon: Icon(Icons.sms),
      ),
      keyboardType: TextInputType.number,
    ),
    FlatButton(
      onPressed: () {},
      textTheme: ButtonTextTheme.primary,
      child: Text('send sms'),
    ),
  ],
)

堆栈(
对齐：alignment.centerRight，
儿童：[
TextFormField(
装饰：输入装饰(
labelText:“验证代码”，
前缀：图标（Icons.sms），
),
键盘类型：TextInputType.number，
),
扁平按钮(
按下：（）{}，
textTheme:buttonexttheme.primary，
子项：文本（“发送短信”），
),
],
)

顺便说一下…

当你点击你的手机时，使用这个功能。 例子

() {
  // This will help to wait for TextField to get focus before
  // we unfocus but it will happen fast so that you won't notice.
  Future.delayed(Duration.zero, () {
    _yourInputFocusNode.unfocus();
    // Your implementation to run when tap suffixIcon in TextField
  });
},

TextFormField(
  focusNode: _phoneNumberFocusNode,
  decoration: InputDecoration(
    suffixIcon: IconButton(
      icon: Icon(Icons.contacts),
      onPressed: () {
        Future.delayed(Duration.zero, () {
          _phoneNumberTwoFocusNode.unfocus();
          Navigator.pushNamed(context, 'Contacts');
        });
      },
    ),
  ),
),