如何在颤动中为下拉按钮制作圆形边框? [英] How to make rounded border for dropdownbutton in flutter?

问题描述

如何添加圆角矩形边框?下面的代码没有在屏幕上产生任何边框.

How to Add Rounded Rectangle Border? Below Code didn't result in any border on screen.

Container(margin: EdgeInsets.only(top: 10.0, right: 10.0, left: 10.0),
 width: double.infinity,
 // decoration: ShapeDecoration(
 //  shape: RoundedRectangleBorder(
 //   borderRadius:BorderRadius.all(Radius.circular(5.0)),
 //                             ),

 child: DropdownButtonHideUnderline(
  child: Container(
   margin: EdgeInsets.only(
    left: 10.0, right: 10.0),
     child: new DropdownButton<UserTest>(...),
                           ),
                          ),
                   ),

推荐答案

您需要指定 side: 属性.默认为 BorderSide.none.

You need to specify the side: property. By default it is BorderSide.none.

      decoration: ShapeDecoration(
        shape: RoundedRectangleBorder(
          side: BorderSide(width: 1.0, style: BorderStyle.solid),
          borderRadius: BorderRadius.all(Radius.circular(5.0)),
        ),
      ),

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