Flutter CachedNetworkImage 不会留下占位符

Question

所以我使用 cachednetworkimage 函数从 firebase 存储中获取图像并在图像可用时显示它。但是，我还希望它在出现问题或用户尚未上传图像时显示模板。在这里我遇到了我的问题：尽管我在无法正确加载图像时收到一条错误消息，但缓存的网络图像一直显示加载动画，甚至懒得切换到错误小部件。有什么我遗漏的吗？

     child: CachedNetworkImage(
      imageUrl: _imageUrl,
      imageBuilder: (context, imageProvider) => Container(
        width: 100.0,
        height: 100.0,
        decoration: BoxDecoration(
          shape: BoxShape.circle,
          border: Border.all(
            color: Colors.white,
            width: 2.0,
          ),
          image: DecorationImage(
              image: imageProvider,
              fit: BoxFit.cover),
        ),
      ),
      placeholder: (context, url) =>
          CircularProgressIndicator(),
      errorWidget: (context, url, error) =>
          Icon(Icons.error),
    fit: BoxFit.cover,
    ),

Answer 1

placeholder 覆盖 errorWidget。用

替换占位符

   progressIndicatorBuilder: (context, url, progress) => LimitedBox(maxHeight: 40,maxWidth: 40, child: CircularProgressIndicator(value: progress.progress,))

Flutter CachedNetworkImage 不会留下占位符

Flutter CachedNetworkImage doesn't leave placeholder

flutter

firebase-storage