AttributedStringExtensions.swift

extension NSAttributedString {
  func medium(sized size: CGFloat) -> NSAttributedString {
    
    //1
    guard !string.isEmpty else { return }
    
    //2
    let mutable = mutableCopy() as! NSMutableAttributedString
  
    //3
    let attribute = [
      NSFontAttributeName : UIFont(name: "AvenirNext-Medium", size: size)
    ]
  
    //4
    mutable.addAttributes(attribute, range: NSRange(location: 0, length: string.characters.count))
  
    return mutable
  }
  
  func colored(_ color: UIColor) -> NSAttributedString {
    
    //1
    guard !string.isEmpty else { return }
    
    //2
    let mutable = mutableCopy() as! NSMutableAttributedString
    
    //3
    let attribute = [
      NSForegroundColorAttributeName : color
    ]
    
    //4
    mutable.addAttributes(attribute, range: NSRange(location: 0, length: string.characters.count))
    
    return mutable
  }

}