swift 手势侧滑

大家所知 自定义导航栏返回图标后 侧滑失效   现贴下解决代码    

    var popDelegate:UIGestureRecognizerDelegate?

       self.popDelegate =self.interactivePopGestureRecognizer?.delegate

        self.delegate =self

  overridefunc pushViewController(_ viewController:UIViewController, animated:Bool) {

        ifviewControllers.count >0 {

            viewController.hidesBottomBarWhenPushed =true

            viewController.navigationItem.leftBarButtonItem =UIBarButtonItem(image: UIImage(named: "lefterbackicon_titlebar_28x28_"), style: .plain, target:self, action: #selector(navigationBack))

            

            //实现滑动返回功能

           //清空滑动返回手势的代理就能实现

            if viewController ==self.viewControllers[0] {

                self.interactivePopGestureRecognizer!.delegate = self.popDelegate

            }

            else {

                self.interactivePopGestureRecognizer!.delegate = nil

            }

        }

        super.pushViewController(viewController, animated:true)

    }