How to change text on a back button

Question

By default the back button uses as a text on it a title of a viewcontroller. Can I change text on the back button without changing a title of a view controller? I need this

Answer 1

//You can achieve this by setting the title in the previous view controller as shown below

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        //Set Title for this view
        self.navigationItem.title = "My Title"

}

override func viewWillDisappear(animated: Bool) {
        super.viewWillAppear(animated)
        //Set Title for back button in next view 
        self.navigationItem.title = "Back"
}