Swift 自定义 UINavigationController 侧滑返回手势

UINavigationController 侧滑手势实现

import UIKit

class HPNavigationController: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let navBar = UINavigationBar.appearance()
        navBar.barTintColor = UIColor.white
        navBar.tintColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.7)
        navBar.titleTextAttributes = [NSFontAttributeName: UIFont.systemFont(ofSize: 17)]
        // 创建全局手势
        self.initGlobalPan()

    }

    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        if viewControllers.count > 0 {
            viewController.hidesBottomBarWhenPushed = true
            viewController.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(named: "back"), style: .plain, target: self, action: #selector(navigationBack))
        }

        .pushViewController(viewController, animated: )
    }

       () {
        popViewController(animated: )
    }

     () ->  {
        
         target  interactivePopGestureRecognizer.delegate
         globalPan  (target: target, action: (()))
        globalPan.delegate  .delegate  ?
        .view.addGestureRecognizer(globalPan)

        
        navigationController.interactivePopGestureRecognizer.isEnabled  

    }

     ( : ) ->  {
         .childViewControllers.count  
    }
}