AFImageRequestOperation返回未下载的图片 [英] AFImageRequestOperation returns image that not downloaded competely

问题描述

+[AFImageRequestOperation imageRequestOperationWithRequest:
                                      imageProcessingBlock:
                                                   success:
                                                   failure:]

如果互联网返回的图片（特别是PNG）没有完全下载和故障阻塞，在这种情况下，不调用。

In case of slow internet returns image (PNG particularly) that didn't download completely and failure block, in this situation, is not being called.

如何检查图片是否正确下载？

How can I check that the image did or didn't download correctly?

/ strong>你会有什么类型的请求没有真正的问题：image，xml，json或http，文件下载可能会失败。

It doesn't really matter what type of request you will have: image, xml, json or http, there are a probability that file downloading will fail. And as file becomes bigger and internet becomes slower the probability increases.

推荐答案

部分解决方案建立在这个问题中：

捕获错误：损坏了JPEG数据：数据段提前结束

检测PNG文件是否在目标C中损坏

Partial solution founded in this questions:
Catching error: Corrupt JPEG data: premature end of data segment
Detect if PNG file is corrupted in Objective C

因此，下载映像后，正确的开始和结束字节。

So, after image was downloaded, you can check does it have correct starting and ending bytes.

修改：这里是一个更灵活的解决方案。

Here is a more flexible solution.

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