Objective-C :
[self.tableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
Swift:
self.tableView.separatorStyle = UITableViewCellSeparatorStyle.None
Swift 5.0 renamed it in :
self.tableView.separatorStyle = UITableViewCell.SeparatorStyle.none
Apply the line in viewDidLoad() method.
If you want to do it from nib file, set the tableView’s Separator property to None