UINavigationController interactivePopGestureRecognizer working abnormal in iOS7

This code can wroks well for me.

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return [gestureRecognizer isKindOfClass:UIScreenEdgePanGestureRecognizer.class];
}

Setting the interactivePopGestureRecognizer.delegate to self is only the first step. The second step is to implement

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return !(otherGestureRecognizer is UIPanGestureRecognizer)
}

The test against the pan gesture recognizer is needed to block vertical scrolling of a scroll or table view while the interactive pop is in progress.

Add in Class Controller "UIGestureRecognizerDelegate"

in viewDidAppear add

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    
    self.navigationController?.interactivePopGestureRecognizer.delegate =  self
}

=)