Swift3 未添加导航项

我正在

UINavigationBar

上添加两个按钮。我能够成功演示导航控制器，但未添加按钮

let secondVC = self.storyboard?.instantiateViewController(withIdentifier: "FilterViewController") as! FilterViewController
        let navigationVC = UINavigationController(rootViewController: secondVC)
        navigationVC.navigationBar.tintColor = UIColor.red
        navigationVC.navigationBar.topItem?.title = "some title"
        navigationVC.navigationBar.isTranslucent = false

        let add = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(dismissFilterView))
        let play = UIBarButtonItem(title: "Play", style: .plain, target: self, action: #selector(dismissFilterView))

        navigationVC.navigationItem.rightBarButtonItems = [add, play]
        self.present(navigationVC, animated: true, completion: nil)

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它不起作用，因为您正在导航栏中添加导航项。外接程序ViewController的导航项

替换

navigationVC.navigationItem.rightBarButtonItems = [add, play]

与

---

注意：下次，请裁剪屏幕截图，然后上传。

secondVC.navigationItem.rightBarButtonItems = [add, play]