Loading Custom Fonts - Swift 3

Fonts+Helper.swift

import UIKit

/// Load Fonts
///
/// Example Usage:
///
/// let fonts = ["SourceSansPro-Regular.otf", "GT-Walsheim-Regular.ttf"]
///
/// let loadedSuccessfuly = loadFonts(fonts)
///
/// - parameter fonts: Array of font names to load including extentions e.g. .otf or .ttf
///
/// - returns: TRUE if ALL fonts loaded correctly
///
public func loadFonts(_ fonts:[String]) -> Bool {
  
  return fonts
    .map { (str) -> (String, String) in
      let components = str.components(separatedBy: ".")
      return (components[0], components[1])
    }
    .filter { (fileComponents) -> Bool in
      if let fontURL = Bundle.main.url(forResource: fileComponents.0, withExtension: fileComponents.1) {
        CTFontManagerRegisterFontsForURL(fontURL as CFURL, CTFontManagerScope.process, nil)
        return true
      }
      
      return false
      
    }.count == fonts.count
  
}