android compose设置圆角不起作用

进度条progress设置背景圆角不起作用：

源码：

   @Composable
    fun CircularProgress(modifier: Modifier, vm: TabarCmpViewModel?) {
        if (vm?.showLoading?.value != true) return
        Box(
            modifier = modifier
                .background(Color(0x99000000))
                .defaultMinSize(minWidth = 118.dp, minHeight = 118.dp)
                .clip(RoundedCornerShape(21.dp))
 
        ) {
            Column(
                horizontalAlignment = Alignment.CenterHorizontally,
                modifier = Modifier.align(Alignment.Center)
            ) {
                CircularProgressIndicator(
                    modifier = Modifier.width(44.dp),
                    color = Color.White
                )
                Text(
                    text = "加载中",
                    color = Color.White,
                    modifier = Modifier
                        .padding(top = 20.dp),
                    fontSize = 14.sp
                )
            }
        }
 
    }

解决：

把圆角放在背景色之前。.clip放在.background前

 Box(
            modifier = modifier
                .clip(RoundedCornerShape(21.dp))
                .background(Color(0x99000000))
                .defaultMinSize(minWidth = 118.dp, minHeight = 118.dp)
        )

效果