AFNetworking预取其他图像 [英] AFNetworking prefetch other images

问题描述

我正在使用 UIImageView + AFNetworking 类别从URL数组下载和显示图像并填充表格视图。

I am using the UIImageView + AFNetworking category to download and display images from an array of URLs and populate a table view.

现在，我发现其他图像被延迟了，因为将仅加载当前单元格的图像。我还需要通过获取其他图像来保持忙碌。

Now I find that the other images are delayed because only the current cell's image will be loaded. I need to keep busy by fetching other images as well.

我的想法是编写一个for循环，并开始使用AFNetworking下载和缓存，例如另外10个请求从当前indexPath开始。

My idea would be to write a for loop and start downloading and caching with AFNetworking, say, 10 other requests starting from current indexPath.

还是我应该照常做 dispatch_async 在完成代码块中并开始获取提到的其他20张图像？

Or should I just do the usual dispatch_async in the completion block and start fetching the mentioned 20 other images?

还有更好的主意吗？

推荐答案

在大多数情况下，预取不会像您预期的那样带来好处。在移动设备上，功率和带宽是有限的资源，这使加载用户可能实际上从未见过的东西的价值产生了疑问。您很可能会聪明一点，对自己造成伤害。

In most cases, pre-fetching won't be nearly as beneficial as you might expect. On a mobile device, power and bandwidth are limited resources, which calls into question the value of loading things that a user may not actually ever see. You're most likely doing a disservice by trying to be clever about this.

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