通过Afnetworking进行大图像缓存 [英] Large Image Caching from Afnetworking

问题描述

我正在使用AFNetworking将一些图像从互联网下载到我的应用程序中。我正在使用此代码下载这些图像，

I'm using AFNetworking to download some images from the internet to my app. I'm using this code to download those images,

AFHTTPRequestOperation *requestOperation = [[AFHTTPRequestOperation alloc] initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:_linkString[indexPath.item]]]];
requestOperation.responseSerializer = [AFImageResponseSerializer serializer];
[requestOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 150, 150)];
    _imageView.image = responseObject;

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Image error: %@", error);
    }];

[requestOperation start]; 

我注意到所有响应图像都通过此方法自动缓存到磁盘。我也希望在我的应用中使用该选项。所有缓存的图像约为150kb。但是，当我下载大约2MB大小的图像时，这些图像不会自动缓存到磁盘。

I noticed that all the response images are cached to the disk automatically from this method. I want that option too in my app. All the cached images are about 150kb size. But when I download an image about 2MB size, those images are not cached automatically to disk.

为什么要缓存小尺寸的图片&大尺寸图像不缓存？我是否使用错误的方法在AFNetworking中缓存图像？

Why small size images are cached & large size images are not cached?? Am I using a wrong way to cache images in AFNetworking?

有人可以给我一种使用AFNetworking缓存2MB图像的解决方案吗....

Can any one give me a solution to cache 2MB images using AFNetworking as well....

谢谢

推荐答案

问题不在于AFNetworking，而在于NSURLCache。默认情况下，NSURLCache不会缓存大于缓存大小的10％（不确定确切百分比）的文件。

The problem is not with AFNetworking but with NSURLCache. By default NSURLCache will not cache files bigger then 10% (not sure what the exact percentage is) of the cache size.

但是增加缓存大小会有所帮助：

But increase the cache size will help:

[[NSURLCache sharedURLCache] setMemoryCapacity:(20*1024*1024)];
[[NSURLCache sharedURLCache] setDiskCapacity:(200*1024*1024)];

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