Load custom fonts within Swift playgrounds

CustomFontPlayground.swift

//: Playground - noun: a place where people can play

import UIKit

let fontURL = NSBundle.mainBundle().URLForResource("PillGothic300mg-bold", withExtension: "ttf")
CTFontManagerRegisterFontsForURL(fontURL!, CTFontManagerScope.Process, nil)

var pillGothicFontBold = UIFont(name: "PillGothic300mg-bold", size: 30)

var attrs = [NSFontAttributeName : pillGothicFontBold!,
  NSForegroundColorAttributeName : UIColor.whiteColor(),
   NSBaselineOffsetAttributeName : 0.0]

let nameAttrSring = NSAttributedString(string: "Pill Gothic font 300mg Bold size 30", attributes: attrs)

In Swift 4.1:

let fontURL = Bundle.main.url(forResource: "PillGothic300mg-bold", withExtension: "ttf")
CTFontManagerRegisterFontsForURL(fontURL! as CFURL, CTFontManagerScope.process, nil)
let font = UIFont(name: "PillGothic300mg-bold", size: 30)!

Thank you so much!