We are using custom fonts in our project. It works well in Xcode 5. In Xcode 6, it works in plain text, attributed string in code. But those attributed strings set in storyboard
You can add custom fonts to font book.
Step1: Click on manage fonts. It opens the font book.
Step2: Click on plus and add your fonts.
Next time when you click on font with attributed text newly added font also will show in the list. But make sure your custom font added in info.plist and bundle resources.