AFNetworking的图像缓存

Question

AFNetworking的缓存机制对我不起作用,我有500ko的大尺寸图像,我想缓存它.但每次我关闭应用程序并再次打开它时,我必须等待20秒才能加载图像,因此缓存系统不能正常运行,代码如下:

我试过了 :

[imageView setImageWithURL:[NSURL URLWithString:imageURL]
      placeholderImage:[UIImage imageNamed:@"placeholder"]];

然后尝试:

NSURLRequest *imageRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:imageURL]
                                          cachePolicy:NSURLRequestReturnCacheDataElseLoad
                                      timeoutInterval:60];

[imageView setImageWithURLRequest:imageRequest
             placeholderImage:[UIImage imageNamed:@"placeholder"]
                      success:nil
                      failure:nil];

Answer 1

NSURLCache不会默认写入磁盘,因此我们需要在app delegate中声明共享的NSURLCache:

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:2 * 1024 * 1024
                                          diskCapacity:100 * 1024 * 1024
                                          diskPath:nil];
[NSURLCache setSharedURLCache:sharedCache];

参考