iPhone:云数据同步加载屏幕不工作

在我的应用程序视图中,我有一个子视图,上面写着“正在加载”,并在同步云数据时出现。

// Reachability test.
BOOL isConnected = [self checkInternet];

// If we have connectivity, then sync data with cloud.
if(isConnected){
    [self beginDataSync]; 
}else{ 
    [self hideLoadingView];
}

- (void)beginDataSync{
    SyncData *syncData = [[SyncData alloc] init];
    [syncData syncDataStart];

    [self startAnimatingIndicator];

    do {
        [syncData dropHoodsData];
        //  [syncData dropBarsData];
        [syncData nameDataComparison];
        [syncData locDataComparison];
        [syncData setLocalNamess];
        [syncData setLocNamePairs];
        [syncData syncDataFinish];
    } while ([syncData isSyncing]);

    BOOL finishedSyncing = [syncData syncDataFinish];
    if (finishedSyncing) {
        [self performSelector:@selector(stopAnimatingIndicator) withObject:nil afterDelay:1.0];
    }


        [syncData release];
}