In #39: Use NSCache Instead of NSMutableDictionary When Caching, we mentioned using NSCache for caching. Sometimes, you want a caching system that persists across app restarts, e.g. downloaded photo thumbnails.

TMCache, an open source library from Tumblr that is disk-backed, and the objects stored only need to conform to NSCoding (so everything that goes into plists, such as NSArray, NSDictionary, NSString, NSNumber, UIImage, NSData, already works).

Writing:

[[TMCache sharedCache] setObject:anImage forKey:@"someImage" block:nil];

Reading:

[[TMCache sharedCache] objectForKey:@"someImage"
    block:^(TMCache* cache, NSString* key, id object) {
        UIImage* image = (UIImage*)object;
    }];

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