如何使用Kingfisher仅将图像缓存在磁盘中? [英] How to cache images only in disk using Kingfisher?

问题描述

我正在使用 Kingfisher 库下载和缓存图像.我在实施过程中遇到了一些问题:

I am using Kingfisher library for downloading and caching images. I am facing some issues in the implementation:

1. 图像是否同时缓存在内存和磁盘中?

1. Are the images cached in both memory and disk?

是否有仅在磁盘上缓存图像的规定?

Is there any provision to cache images only on disk?

我已经阅读了许多与此相关的文章，但是找不到任何解决方案.

I have already read multiple posts regarding this, but couldn't find any solution.

推荐答案

是的，Kingfisher在内存和磁盘上都缓存了图像.

Yes, Kingfisher caches images both in memory and on disk.

默认情况下，将使用的RAM数量甚至没有限制，您必须自己设置该值:

By default, the amount of RAM that will be used is not even limited, you have to set the value yourself:

ImageCache.default.maxMemoryCost = 1024 * 1024 * yourValue

其中1024 * 1024 * yourValue是百万像素的全球成本(我知道这很奇怪，但不是兆字节，而是百万像素，因为图像可以具有不同的位深等).

where 1024 * 1024 * yourValue is the global cost in megapixels (I know this is weird, but it's not megabytes, it's megapixels, because images can have different bit depth, etc).

例如，在我的测试中，使用的最大RAM值为1024 * 1024 * 500在120MB和300MB之间波动.

For example, in my tests, the maximum RAM used with a value of 1024 * 1024 * 500 fluctuates between 120MB and 300MB.

顺便说一句，这也是告诉Kingfisher不要使用RAM而是仅缓存到磁盘的方法:

Incidentally, this is also how you tell Kingfisher to never use the RAM and only cache to disk:

ImageCache.default.maxMemoryCost = 1

这将迫使Kingfisher仅使用磁盘缓存.

This will force Kingfisher to only use the disk cache.

如何调试

第一件事是检查您是否在正确的缓存上设置了最大值.也许您确实创建了自定义缓存?我的示例是为默认缓存设置值，如果未定义其他值，则使用该值.

The first thing is to check that you're setting the max value on the right cache. Maybe you did create a custom cache? My example is setting the value for the default cache, the one used if no other is defined.

您可能还想手动清除内存缓存并比较之前和之后的RAM占用情况:

You may also want to manually clear the memory cache and compare the RAM occupation before and after:

ImageCache.default.clearMemoryCache()

如果您认为不应该在内存缓存中保存一些大图像，则可以使用isImageCached进行验证:

If you think that some big image is in the memory cache when it shouldn't be, you can verify with isImageCached:

if let result = ImageCache.default.isImageCached(forKey: imageLink) {
    print(result.cached)
    print(result.cacheType)
}

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