目的：当push到下一控制器时，里面整个界面用手势侧滑是可以返回的
步骤：1.自己写一个UINavigationController子类

import UIKit

class QNavigationController: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()

        //校验手势是否有值
        guard let interacionGes = interactivePopGestureRecognizer else {
            return
        }
        /*
        //通过运行时获取对应的手势属性
        var count : UInt32 = 0
        let ivars = class_copyIvarList(UIGestureRecognizer.self, &count)!
        for i in 0..<count {
            let ivar = ivars[Int(i)]
            let namep = ivar_getName(ivar)
            let name = String(cString: namep!)//属性名称
            print(name)
        }
        */
        guard let values = interacionGes.value(forKeyPath: "_targets") as? [NSObject] else{
            return
        }
        
        guard let objc = values.first else {
            return
        }
        //根据KVC取出action 和target
        let target = objc.value(forKeyPath: "target")
        let action = Selector(("handleNavigationTransition:"))
        //下面是获取不到action的会奔溃
        //        let action = objc.value(forKeyPath: "action") as? Selector
        
        //创建自己的手势 将系统的手势去代替自己创建的手势
        let panGes = UIPanGestureRecognizer(target: target, action: action)
        
        view.addGestureRecognizer(panGes)
        
    }
}

2.将该UINavigationController的子类作为你的导航控制器即可