当像这样加载图像时，可以使用progressIndicatorBuilder

progressIndicatorBuilder:
                          (context, url, downloadProgress) => Container(
                        decoration: const BoxDecoration(
                          shape: BoxShape.circle,
                          color: Colors.white,
                        ),
                      ),

或尝试此占位符

placeholder: (context, url) => CircularProgressIndicator(),

CachedNetworkImage的Placeholder属性是具有参数(BuildContext context, String url)的函数 *，并且返回**Widget。
尝试以下方法：

CachedNetworkImage(
    height: 100,
    width: 100,
    imageUrl: 'imageUrl',
      fit: BoxFit.cover,

    placeholder: (context, url) => Container(
      color:  Colors.transparent,
      height: 100,
      width: 100,
      child: SpinKitFadingCircle(
        color: ColorConstants.colorPrimary,
        size: 30,
      ),
    ),

    errorWidget: (context, url, error) => Image.asset(
       placeHolderImage,
      width: 100,
      height: 100,
      fit: BoxFit.cover,
    ),
  )

变化

placeholder: CircularProgressIndicator(),

到

placeholder: (context,url) => CircularProgressIndicator(),