indexPath not updated after using deleteRowsAtIndexPaths

Question

I created a method which updates my UITableView when the user wants to delete a cell.

-(void)removeMoreFriendsRow:(NSNotification *)notification {
NSDictionary *d = [notification userInfo];
NSIndexPath *index = [d objectForKey:@"indexPath"];
    
[self.p_currentFriends removeObjectAtIndex:index.row];
    
[self.o_table deleteRowsAtIndexPaths:[NSArray arrayWithObject:index] withRowAnimation:UITableViewRowAnimationRight];
}

p_currentFriends is a NSMutableArray which contains all the objects printed by the UITableView.

This method works fine when I use it once, but it fails when I use it more than once.

It appears that the indexPath stay the same at each call of deleteRowsAtIndexPaths.

For example,

• at the first call, the user taps on the second cell, indexPath = [0,1] and the correct cell is deleted,
• at the second call, the user taps on the third cell and indexPath = [0,3] instead of [0,2]

The only way I found to make it works is to use reloadData but I want to have a animation on the cell deletion.

How can I do this?

Answer 1

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 
            withRowAnimation:UITableViewRowAnimationFade];

Answer 2

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)

Answer 3

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];
  }
  }];