Flutter 给raisedButton添加边框

Flutter raisedButton 并没有border属性，只能借助shape的RoundedRecangleBorder来进行添加，代码如下：

RaisedButton(
    onPressed: () {},
    child: Text(
        'Label Here',
        style: TextStyle(color: Colors.black),
    ),
    color: Colors.transparent,
    shape: RoundedRectangleBorder(
        side: BorderSide(color: Colors.blue)
    ),
),