现象描述

实际开发过程中，难免会重写UINavigationController的左返回按钮，然后就导致了系统默认的右滑返回失效。

如何处理

直接先上关键代码：

public class DZBaseNavigationController: UINavigationController {

    public override func viewDidLoad()
    {
        super.viewDidLoad()
        //处理右滑返回手势
        let selector = NSSelectorFromString("interactivePopGestureRecognizer")
        if self.responds(to: selector){
            self.interactivePopGestureRecognizer?.delegate = self
            self.delegate  = self
        }
    }
    
    //重写父类方法
    public override func pushViewController(_ viewController: UIViewController, animated: Bool)
    {
        //处理右滑返回手势
        let selector = NSSelectorFromString("interactivePopGestureRecognizer")
        if self.responds(to: selector){
            self.interactivePopGestureRecognizer?.isEnabled = false
        }
           
        super.pushViewController(viewController, animated: animated) 
    }
       
}

extension DZBaseNavigationController:UINavigationControllerDelegate,UIGestureRecognizerDelegate{
    //处理右滑返回手势
    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        return true
    }
    //DZBaseViewController为项目中所有UIViewController的子类，也就是目前项目中所有的UIViewController都是用的DZBaseViewController，DZBaseViewController里可以添加一些基础属性，比如：    ///是否能右滑返回    var isCanGestureBack:Bool = true

    public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        let selector = NSSelectorFromString("interactivePopGestureRecognizer")
        let currentvc = self.topViewController
        if self.responds(to: selector){
            if gestureRecognizer == self.interactivePopGestureRecognizer{
                if self.viewControllers.count == 1{
                    return false
                }else{
                    if let vc = currentvc as? DZBaseViewController{
                      if vc.isCanGestureBack == false{
                        return false
                      }else{
                        return true
                      }
                    }else{
                        return false
                    }
                }
            }
        }
        
        return false
    }
    
    public func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
        let selector = NSSelectorFromString("interactivePopGestureRecognizer")
        if self.responds(to: selector){
            self.interactivePopGestureRecognizer?.isEnabled = true;
        }
    }
    
}

备注：

关键字为：

interactivePopGestureRecognizer

所有的逻辑都在DZBaseNavigationController里，DZBaseViewController继承UIViewController，isCanGestureBack参数可以在具体某个不需要手势右滑返回的UIViewController中设置为：false

class DZBaseViewController: UIViewController {
    ///是否能右滑返回
    var isCanGestureBack:Bool = true
}

比如某个UIViewController不需要支持右滑返回：

class DZPasswordLoginVC: DZBaseViewController {    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.isCanGestureBack = false
    }
}