How to set font family to Navigation Controller Ti

问题:

I have one View Controller named "Home". I embed it in Navigation Controller.

 self.navBar.topItem?.title = "Home"

I would like to change "Tharlon" font to my UIViewController title bar.

self.navBar.topItem?.title = NSLocalizedString("Home", comment: "")
self.navigationController?.navigationBar.titleTextAttributes = [NSFontAttributeName: UIFont(name: "Tharlon", size: 17)!]

Both these codes are in ViewDidLoad() function.
When I run the app, Translated text shows well at the first time. Then, I open other menus and goes back to Home. At that second time, translated text does not show well and it does not looks in Unicode font.

That works well at the first time !

This is not well after I view other pages and goes back to Home.

I also tried to put these above code in ViewWillAppear . But it still not works.
Please, can anyone help me?