An example of how we at HRS expand the `UITableViewDelegate` protocol to trigger custom actions from a cell and communicate them to the table view's delegate.

ExtendUITableViewDelegate.m

@protocol HRSStepperTableViewCellDelegate<UITableViewDelegate>
- (void)tableView:(UITableView *)tableView didChangeStepperValue:(UIStepper *)stepper forRowWithIndexPath:(NSIndexPath *)indexPath;
@end

@implementation HRSStepperTableViewCell

- (UITableView *)tableView {
    UIView *superview = self.superview;

    while (superview != nil && [superview isKindOfClass:[UITableView class]] == NO) {
        superview = superview.superview;
    }
    return (UITableView *)superview;
}

- (IBAction)stepperValueChanged:(id)sender {
    if (sender != self.stepper) {
        return;
    }
    UITableView *tableView = self.tableView;
    id<HRSStepperTableViewCellDelegate> delegate = (id<HRSStepperTableViewCellDelegate>)tableView.delegate;
    if ([delegate respondsToSelector:@selector(tableView:didChangeStepperValue:forRowWithIndexPath:)]) {
        [delegate tableView:tableView didChangeStepperValue:sender forRowWithIndexPath:[tableView indexPathForCell:self]];
    }
}

@end