indexPath not updated after using deleteRowsAtIndexPaths

What you're doing is basically correct, but you'll need to reload the tableView somehow. If you don't want to reload the whole tableView, use this, which gives you an animation as well -

NSIndexSet *indexSet = [NSIndexSet indexSetWithIndex:sectionNum];
[self.o_table reloadSections:indexSet 

Swift 2.2

The best solution I found is to set an NSTimer and call the reload data 0.5 sec after, which gives enough time for the animation to finish. The Selector("loadData") is a method that contains tableview.reloadData()

_ = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: Selector("loadData"), userInfo: nil, repeats: false)

Swift 3.0

_ = Timer.scheduledTimer(timeInterval: 0.5, target: self, selector: #selector(ViewController.loadData), userInfo: nil, repeats: false)

The reloadSections: method works but it doesn't give you the normal animation for deleting a row, instead using a fade animation. In iOS 11 a new method is available which solves this:

  [tableView performBatchUpdates:^(
    [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
             completion:^(BOOL finished)
    if( finished){ 
      [tableView reloadData];