PROSAGA码农传奇-flutter-颤动输入装饰后缀没有出现但始终显示交叉符号

<div class =“post-text”itemprop =“text”>
  <P>
    我通过单挑出来重新创造了你的案例
     <code>
      TextFormField
    </code>
     你提供的代码，并能够看到
     <code>
      dropdown arrow
    </code>
     如
     <code>
      suffixIcon
    </code>
    。
  </p>
  <P>
    <a href="https://i.stack.imgur.com/aA0Wj.png" rel="nofollow noreferrer">
      <img src =“https://i.stack.imgur.com/aA0Wj.png”alt =“在此处输入图片说明”/>
    </A>
  </p>
   <pre>
    <code>
      @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Container(
        height: MediaQuery
            .of(context)
            .size
            .height,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
            children : [
              new Container(
                color: Colors.yellow,
                width: 200.0,
                  child: TextFormField(
                  decoration: InputDecoration(
                      hintText: 'To',
                      border: InputBorder.none,
                      filled: false,
                      prefixIcon: Icon(
                        Icons.arrow_drop_down,
                        color: Colors.blue,
                        size: 28.0,
                      ),
                      suffixIcon: IconButton(
                          icon: Icon(Icons.arrow_drop_down,size: 28),
                          onPressed: () {
                            debugPrint('222');
                          })),
                ),
              )
        ]
              )
        ),
      )
      );
  }
}

</code>
  </pre>
  <P>
    我看到你用过了
     <code>
      Padding
    </code>
     身为你的
     <code>
      body
    </code>
     回来
     <code>
      Scaffold
    </code>
    。尝试用它替换它
     <code>
      Center
    </code>
     要么
     <code>
      Container
    </code>
  </p>
</DIV>