flutter 图片圆角

 return Center(
      child: Container(
        padding: EdgeInsets.only(left: 10),
         120,
        height: 80,
        child: ClipRRect(
          borderRadius: BorderRadius.circular(5),
          child: CachedNetworkImage(
             120,
            height: 80,
            imageUrl: (img == null) ? '' : img,
            placeholder: (context, url) =>
                Image.asset('images/placeholder.png'),
            fit: BoxFit.cover,
          ),
        ),
      ),
    );