change navigation bar title font – swift

Try this:

Objective-C

[[UINavigationBar appearance] setTitleTextAttributes:attrsDictionary];

Swift 3

self.navigationController.navigationBar.titleTextAttributes = [NSFontAttributeName: UIFont(name: "CaviarDreams", size: 20)!]

Swift 4

self.navigationController.navigationBar.titleTextAttributes = [NSAttributedStringKey.font: UIFont(name: "CaviarDreams", size: 20)!]