importUIKit

class twoVC: UIViewController {

    lazyvarbackButton:UIButton= {

         var backButton = UIButton.init(type: UIButton.ButtonType.custom)

             backButton.setTitle("返回", for:UIControl.State.normal)

            backButton.frame.size=CGSize.init(width:UIScreen.main.bounds.width, height:40)

            backButton.frame.origin=CGPoint.init(x:0, y:80)

             backButton.addTarget(self, action:#selector(backAcion), for:UIControl.Event.touchUpInside)

        backButton.backgroundColor = UIColor.blue

        backButton.titleLabel?.textAlignment = .left

         returnbackButton

     }()

    var navigationDelegete : UIGestureRecognizerDelegate!

    override func viewDidLoad() {

        super.viewDidLoad()

        initSet()

        view.backgroundColor = UIColor.orange

    }

    /// 手势设置代理放在这里,否则侧滑过程中方弃操作, viewWillDisappear会调用,再回来时手势说失效了

    overridefuncviewWillAppear(_animated:Bool) {

        super.viewWillAppear(animated)

        ///保存上层控制器代理

        self.navigationDelegete = self.navigationController?.interactivePopGestureRecognizer?.delegate

        /// 设置新导航控制器代理为自己

        self.navigationController?.interactivePopGestureRecognizer?.delegate = self

        /// 侧滑时不导航条不闪烁

        self.navigationController?.setNavigationBarHidden(true, animated: true)

    }

    overridefuncviewWillDisappear(_animated:Bool) {

        super.viewWillDisappear(animated)

        ///恢复导航控制器代理

        self.navigationController?.interactivePopGestureRecognizer?.delegate = self.navigationDelegete

        /// 侧滑时不导航条不闪烁

        self.navigationController?.setNavigationBarHidden(false, animated: true)

    }

    @objcfuncbackAcion()  {

        navigationController?.popViewController(animated: true)

    }

    funcinitSet() {

        view.addSubview(backButton)

        title="\(self.self)"

    }

}

extension UIViewController:UIGestureRecognizerDelegate{

    /// 允许手势 开始识别

    publicfuncgestureRecognizerShouldBegin(_gestureRecognizer:UIGestureRecognizer) ->Bool{

        return true

    }

    /// 允许多个手势,识别

    publicfuncgestureRecognizer(_gestureRecognizer:UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer:UIGestureRecognizer) ->Bool{

           returntrue

    }

}