Cannot Set Navigation Bar Font in Swift on Latest Xcode Version

Whoops. I figured this out on my own:

I needed an exclamation point following my declaration of the NSFontAttributeName as it requires a type "NSString!". Perhaps it only required an "NSString" before, but I have no issues now.

Working line:

NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 24)!

Working full code:

override func viewDidAppear(animated: Bool) {  
     self.navigationController?.navigationBar.topItem?.title = "Home"
     self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34)!,  NSForegroundColorAttributeName: UIColor.whiteColor()]
}

Seems like a silly question now. Hope this helps someone else!

You are using UIFont(name: intializer as it is defined as

init?(name fontName: String, size fontSize: CGFloat) -> UIFont

failable intializer read more from link.So it is returning optional.You need to unwrap it as it require AnyObject not optional.

 self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34)!,  NSForegroundColorAttributeName: UIColor.whiteColor()]

Thanks Benji!!!

I changed it a bit and applied it to the appearance attribute of the navigation controller.

    var navigationBarAppearance = UINavigationBar.appearance()

    navigationBarAppearance.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "OpenSans", size: 16)!,  NSForegroundColorAttributeName: UIColor.whiteColor()]