Cannot add Bar Button Item to Navigation Controller in Xcode

Question

I am building a todo list app to get more practice with tableViews and delegates. I have embedded my primary tableViewController in a Navigation Controller and I have created two additional view controllers, one for adding a task and one fore editing a task. When I attempt to add a bar button item to one of the additional view controllers (done, trash, etc), Xcode is placing the item in a tab bar along the bottom of the screen and when I run the app, those items are not visible. I have changed the type of device I am working on, relaunched Xcode entirely, and I cannot figure out why this is happening. I have added a screenshot below and here is a link to the repo. Any ideas why this is happening?

Answer 1

first you need to add Navigation Item in Navigation Bar. then add UIBarButton in Navigation Item.

Answer 2

Programatically you can add as:

        let shareBarButtonItem = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(self.shareClass))

        let downloadBarButtonItem = UIBarButtonItem(image: UIImage(string: UIImage(named: "your_image_name")), style: .plain, target: self, action: #selector(self.downloadClass))

        self.navigationItem.setRightBarButtonItems([shareBarButtonItem, downloadBarButtonItem], animated: true)