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https://stackoverflow.com/questions/26008536/navigationbar-bar-tint-and-title-text-color-in-ios-8

In AppDelegate.swift, in application(_:didFinishLaunchingWithOptions:) I put the following:

UINavigationBar.appearance().barTintColor = UIColor(red: 234.0/255.0, green: 46.0/255.0, blue: 73.0/255.0, alpha: 1.0)
UINavigationBar.appearance().tintColor = UIColor.white
UINavigationBar.appearance().titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]

For titleTextAttributes, the docs say:
You can specify the font, text color, text shadow color, and text shadow offset for the title in the text attributes dictionary