swift 3 : I can't hide the back button

Question

我正在使用 Tab Bar Controller，上面有 2 个 View Controller 。在此之前，我有另一个 viewController 来访问标签栏。当我得到标签栏时，后退按钮总是消失。我想隐藏后退按钮，用另一个按钮作为左键，但我无法隐藏后退按钮。

这是 Tab Bar 之前的 viewController 中的代码:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "mainvc"{
        if pinLabel.text == pinPassword && pinLabel.text != ""{
            let tabBarController = segue.destination as! UITabBarController
            let destinationViewController = tabBarController.viewControllers?[0] as! ViewController

            destinationViewController.login.email = login.email
            destinationViewController.login.firstname = login.firstname
            destinationViewController.login.lastname = login.lastname
            destinationViewController.login.imageURL = login.imageURL
            destinationViewController.login.id = login.id                
        }else{

        }

    }
}

这是我试图隐藏后退按钮并将另一个按钮放入其中一个 View Controller 的代码，这是我在访问选项卡栏 Controller 时看到的 View Controller :

let leftOpenSideBarMenu: UIBarButtonItem = UIBarButtonItem(image: myimage, style: .plain, target: self, action: #selector(ViewController.openSideBarMenu))
self.navigationItem.setHidesBackButton(true, animated: false)
self.navigationItem.setLeftBarButtonItems([leftOpenSideBarMenu], animated: true)

Answer 1

尝试

self.tabBarController.navigationItem.setHidesBackButton(true, animated: false)
self.tabBarController.navigationItem.setLeftBarButtonItems([leftOpenSideBarMenu], animated: true)

代替

self.navigationItem.setHidesBackButton(true, animated: false)
self.navigationItem.setLeftBarButtonItems([leftOpenSideBarMenu], animated: true)