DFCache *cache = [[DFCache alloc] initWithName:@"image_cache"];
NSString *key = @"http://..."; // Key can by any arbitrary string.
UIImage *image = ...; // Instead of UIImage you can use the same API for objects conforming to NSCoding protocol

// Store image
[cache storeObject:image forKey:key];
// [cache storeObject:image forKey:key data:data]; - you can store original image data

// Retrieve decompressed image
[cache cachedObjectForKey:key completion:^(id object) {
    // All disk IO operations are run on serial dispatch queue
    // which guarantees that the object is retrieved successfully.
    NSLog(@"Did retrieve cached object %@", object);
}];

[cache removeObjectForKey:key];

DFCache *cache = [[DFCache alloc] initWithName:@"sample_cache"];
NSDictionary *object = @{ @"key" : @"value" };
[cache storeObject:object forKey:@"key"];
[cache setMetadata:@{ @"revalidation_date" : [NSDate date] } forKey:@"key"];
NSDictionary *metadata = [cache metadataForKey:@"key"];

DFCache *cache = ...;
[cache batchCachedObjectsForKeys:keys completion:^(NSDictionary *batch) {
    for (NSString *key in keys) {
        id object = batch[key];
        // Do something with an object.
    }
}];

DFFileStorage *storage = [[DFFileStorage alloc] initWithPath:path error:nil];
[storage setData:data forKey:@"key"];
[storage dataForKey:@"key"];

DFFileStorage *storage = [[DFFileStorage alloc] initWithPath:path error:nil];
NSArray *resourceKeys = @[ NSURLContentModificationDateKey, NSURLFileAllocatedSizeKey ];
NSArray *contents = [storage contentsWithResourceKeys:resourceKeys];
for (NSURL *fileURL in contents) {
    // Use file URL and pre-fetched file attributes.
}

NSURL *fileURL = [NSURL fileURLWithPath:path];
[fileURL df_setExtendedAttributeValue:@"value" forKey:@"attr_key"];
NSString *value = [fileURL df_extendedAttributeValueForKey:@"attr_key" error:NULL];
[fileURL df_removeExtendedAttributeForKey];