如何清除AlamofireImage setImageWithURL缓存

本文介绍了如何清除AlamofireImage setImageWithURL缓存的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在项目中经常使用AlamofireImage，并且使用

I am using AlamofireImage in my project quite a lot and I use

let URL = NSURL(string: "cdn.domain/profile/image.jpg")! imageView.af_setImageWithURL(URL)

从我的CDN中获取图像。我已经进行了一些测试，但是如果我错了，请更正我，这似乎会将下载的图像存储到缓存中。我的测试包括下载5mb的图像。第一次大约花了20秒，第二次是瞬间。

to fetch an image from my CDN. I have done some tests but correct me if I am wrong, this seems to store the downloaded image in to a cache. My tests included downloading a 5mb image. The first time it took about 20 seconds, the second time was instant.

我想知道的是如何清除特定URL /图像的缓存并重新下载图片？

The thing I would like to know is how can I clear the cache for a specific URL/image and re-download the image?

例如，我更新了用户个人资料照片。图像名称/ URL会完全相同，但是我知道图像会随着用户从库或相机中选择新图像而发生变化。我知道该图像已成功上传到CDN，因为我可以直接在CDN上的文件夹中看到新图像。

Say for example I update a users profile pic. The image name/URL will be exactly the same but I know the image has changes as the user selected a new image from their library or camera. I know the image has been uploaded successfully to the CDN as I can see the new image in the folder directly on the CDN.

推荐答案

您需要从内存缓存和磁盘缓存中删除映像。您可以执行以下操作：

You need to remove the image from the in-memory cache as well as the on-disk cache. You can do this as follows:

func clearImageFromCache() { let URL = NSURL(string: "cdn.domain/profile/image.jpg")! let URLRequest = NSURLRequest(URL: URL) let imageDownloader = UIImageView.af_sharedImageDownloader // Clear the URLRequest from the in-memory cache imageDownloader.imageCache?.removeImageForRequest(URLRequest, withAdditionalIdentifier: nil) // Clear the URLRequest from the on-disk cache imageDownloader.sessionManager.session.configuration.URLCache?.removeCachedResponseForRequest(URLRequest) }

当前， URLCache 只能以这种方式在 master 分支上被清除。我刚刚推送了 f35e4748 ，它允许访问底层的 sessionManager 。尚未在实际版本中提供此功能，但应该在本周的某个时间出现。

Currently, the URLCache can only be cleared in this manner on the master branch. I just pushed f35e4748 which allows access to the underlying sessionManager in the ImageDownloader. This is not yet available in an actual release yet, but should be here sometime this week.