GroupSample.m

- (void)loginComplete {

    dispatch_group_t group = dispatch_group_create();

    dispatch_group_enter(group);
    dispatch_group_enter(group);

    [self.languageRouter receiveWithSuccess:^(NSDictionary *object) {
        [self createOrUpdateLanguagesWithJSON:object completion:^{
            dispatch_group_leave(group);
        }];
    } failure:^(NSString *message, NSInteger code, ErrorType type) {
        self.successfullDownload = NO;
        [self.hud hideAnimated:YES];
        [self showAlertWithTitle:@"" message:message];
        dispatch_group_leave(group);
    }];

    [self.languageRouter receiveCountriesWithSuccess:^(NSDictionary *object) {
        [self createOrUpdateCouintriesWithJSON:object completion:^{
            dispatch_group_leave(group);
        }];
    } failure:^(NSString *message, NSInteger code, ErrorType type) {
        self.successfullDownload = NO;
        [self.hud hideAnimated:YES];
        [self showAlertWithTitle:@"" message:message];
        dispatch_group_leave(group);
    }];

    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        if (self.successfullDownload) {
            [self languageCountryDownloadCompleted];
        } else {
            [Profile clear];
        }
    });
}