輕量級的零設置 iOS 圖像緩存器：Haneke

Haneke 是個輕量級的零設置 iOS 圖像緩存器。Haneke 可以調整圖像和內存以及硬盤的緩存大小。所有的步驟都在后臺進行，允許快速響應滾動。

特性：

• First-level memory cache using NSCache.
• Second-level LRU disk cache using the file system.
• Zero-config UIImageView category to use the cache, optimized for UITableView and UICollectionView cell reuse.
• Asynchronous and synchronous image retrieval.
• Background image resizing and file reading.
• Custom image transformations before and after resizing.
• Thread-safe.
• Automatic cache eviction on memory warnings or disk capacity reached.
• Preloading images from the disk cache into memory on startup.

HNKCacheFormat *format = [[HNKCacheFormat alloc] initWithName:@"thumbnail"];
format.size = CGSizeMake(320, 240);
format.scaleMode = HNKScaleModeAspectFill;
format.compressionQuality = 0.5;
format.diskCapacity = 1 * 1024 * 1024; // 1MB
format.preloadPolicy = HNKPreloadPolicyLastSession;
imageView.hnk_cacheFormat = format;

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