swift vc多层push后回到指定页面

//获取当前的nvc
func getCurrentNavigationController()->UINavigationController?{
    
    var parent: UIViewController?
    if let window = UIApplication.shared.delegate?.window,let rootVC = window?.rootViewController {
        parent = rootVC
        while (parent?.presentedViewController != nil) {
            parent = parent?.presentedViewController!
        }
        
        if let tabbar = parent as? UITabBarController ,let nav = tabbar.selectedViewController as? UINavigationController {
            return nav
        }else if let nav = parent as? UINavigationController {
            return nav
        }
    }
    return nil
}

//pop回指定类名的控制器
func backToController(ctrlClassName : String,animated : Bool){
    let nvc = getCurrentNavigationController()
    if nvc != nil{
        let controllers = nvc?.viewControllers as! NSArray
        let result = controllers.filtered(using: NSPredicate(block: { (evaluatedObject, bindings) -> Bool in
            return (evaluatedObject as AnyObject).isKind(of: NSClassFromString(ctrlClassName)!)
        }))
        if result.count > 0 {
            nvc?.popToViewController(result[0] as! UIViewController, animated: animated)
        }
    }
}

调用

backToController(ctrlClassName: "AViewController", animated: true)