The question is plain easy and simple, the answer unfortunately not.
How can you change the font of the text in the UINavigationBar?
Not sure why all the answers included the shadow. Adding the lines that manipulate the shadow does nothing in respect to changing text font. These 2 lines of code will work for iOS 8.4 and Swift
let attributesDictionary = [NSFontAttributeName: UIFont(name: "Helvetica Neue", size: 14)!]
navigationController!.navigationBar.titleTextAttributes = attributesDictionary
The titleTextAttributes stores a dictionary that will dictate the font, color, size, and other attributes of the navigation bar's title.