swift/ios-推送新视图控制器时保留uinavigationitem

实际上它在那里很长一段时间了。只需将rootviewcontroller或currentvc设置为uinavigationbar的委托。

 class RootVC :  UIViewController, UINavigationBarDelegate{


   func navigationBar(_ navigationBar: UINavigationBar, shouldPush item: UINavigationItem) -> Bool{
    return false;
}

override func viewDidLoad() {
    super.viewDidLoad()
    navigationController?.navigationBar.delegate = self
}}