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How to upload 10 images to server from iPhone app?
- (void)applicationDidEnterBackground:(UIApplication *)application
{
    // self.backgroundTask is a property on the app delegate.
    if (self.backgroundTask != UIBackgroundTaskInvalid) // A background task is still in process. Bail early.
        return;

    __weak AppDelegate *weakSelf = self; // Create a weak reference to self to avoid retain cycles
    self.backgroundTask = [application beginBackgroundTaskWithExpirationHandler:^{
        [application endBackgroundTask:weakSelf.backgroundTask];
        weakSelf.backroundTask = UIBackgroundTaskInvalid
    }];

    dispatch_async((DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        // Kick off task to upload photos here.

        [application endBackgroundTask:weakSelf.backgroundTask];
        weakSelf.backgroundTask = UIBackgroundTaskInvalid;
    });
}