gistfile1.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  // Create a 4MB in-memory, 32MB disk cache
  NSURLCache *cache = [[NSURLCache alloc] initWithMemoryCapacity:4*1024*1024
                                                    diskCapacity:32*1024*1024
                                                        diskPath:@"app_cache"];

  // Set the shared cache to our new instance
  [NSURLCache setSharedURLCache:cache];
}