Question

I have a tableView showing an NSMutableArray of an object and I am currently trying to implement the tableView:commitEditingStyle:forRowAtIndexPath: method. If I comment out the line [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade]; everything works just fine, outside of updating the UI.

This is my implementation of the method:

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [self.modelClass removeObjectAtRow:indexPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}

This is the error I get:

*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-2280.1/UITableView.m:1060

Other questions have had answers suggesting that I need to replace the @[indexPath] with [NSArray arrayWithObject:indexPath], and that just comes up with the same error.

Answer 1

This comes because UITableView enters the datasource method numberOfRowsInSection again, after the deletion of rows. Make sure that it returns correct number of rows that is your self.modelClass.count in numberOfRowsInSection.