如何使按钮的角仅在顶部变圆？

Question

我正在尝试制作一个按钮，该按钮的顶部为圆角，底部为正常角。我怎么能这样呢？

Answer 1

一般示例：

RaisedButton(
              onPressed: () {},
              shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.only(
                      topLeft: Radius.circular(15.0),
                      topRight: Radius.circular(15.0))),
              child: Text('Click Me!'),
              color: Colors.blueAccent,
              textColor: Colors.white,
            ),

据每个pskink评论：

RaisedButton(
              onPressed: () {},
              shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.vertical(
                top: Radius.circular(15.0),
              )),
              child: Text('Click Me!'),
              color: Colors.blueAccent,
              textColor: Colors.white,
            ),