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#import "MBProgressHUD.h"
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
    // do something...
    Service *service = [Service instance];
    [service resizeDownLoadImage];
    dispatch_async(dispatch_get_main_queue(), ^{
      // update main UI
      [hud removeFromSuperview];
      //UITableView/UICollectionView reloadData is synchronous call
      //[self.collectionview reloadData];
      [self presentMainViewController];
    });
});

MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
hud.mode = MBProgressHUDModeText;
hud.labelText = msg;
hud.margin = 10.f;
hud.yOffset = self.view.frame.size.height*0.5 - 15.f;
hud.removeFromSuperViewOnHide = YES;
// auto hide after 1 second
[hud hide:YES afterDelay:1];