[iOS8] Периодическое обновление данных - Objective-C - Ответ 7023064

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
        
        [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings
                                                                             settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeSound
                                                                             categories:nil]];
    }
    
    if([[[UIDevice currentDevice] systemVersion] floatValue] >=7.0){
        [[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:10];
    }
    
    UILocalNotification *lntfMainNotification = [launchOptions objectForKey:UIApplicationBackgroundRefreshStatusDidChangeNotification];
    
    if (lntfMainNotification) {
        [application cancelAllLocalNotifications];
    }

-(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
 
    BackupDataViewController *backupController = [BackupDataViewController new];
    
    [backupController fetchNewDataWithCompletionHandler:^(UIBackgroundFetchResult result) {
        
        NSLog(@"Fetched");
        completionHandler(UIBackgroundFetchResultNewData);
    }];
    
}