AppleShortcuts.swift

public extension UIColor {  
  convenience init(r: CGFloat, g: CGFloat, b: CGFloat) {
    self.init(red: r/255, green: g/255, blue: b/255, alpha: 1)
  }
  static var customBackgroundColor: UIColor = {
    return UIColor(r: 239, g: 239, b: 244)
  }()
  convenience init(hexString: String, alpha: CGFloat = 1) {
    assert(hexString[hexString.startIndex] == "#", "Expected hex string of format #RRGGBB")
    let scanner = Scanner(string: hexString)
    scanner.scanLocation = 1  // skip #
    var rgb: UInt32 = 0
    scanner.scanHexInt32(&rgb)
    self.init(
      red:   CGFloat((rgb & 0xFF0000) >> 16)/255.0,
      green: CGFloat((rgb &   0xFF00) >>  8)/255.0,
      blue:  CGFloat((rgb &     0xFF)      )/255.0,
      alpha: alpha)
  }
  func toHexString() -> String {
    var r:CGFloat = 0
    var g:CGFloat = 0
    var b:CGFloat = 0
    var a:CGFloat = 0
    getRed(&r, green: &g, blue: &b, alpha: &a)
    let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0
    return String(format:"#%06x", rgb)
  }
  class func color(data:Data) -> UIColor? {
    return try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as? UIColor
  }
  func encode() -> Data? {
    return try? NSKeyedArchiver.archivedData(withRootObject: self, requiringSecureCoding: false)
  }
  static func hexStringToUIColor (hex:String) -> UIColor {
    var cString:String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
    if (cString.hasPrefix("#")) {
      cString.remove(at: cString.startIndex)
    }
    if ((cString.count) != 6) {
      return UIColor.gray
    }
    var rgbValue:UInt32 = 0
    Scanner(string: cString).scanHexInt32(&rgbValue)
    return UIColor(
      red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
      green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
      blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
      alpha: CGFloat(1.0)
    )
  }
}

extension UIView {
  func setGradientBackgroundColor(colorOne: UIColor, colorTow: UIColor) {
    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = bounds
    gradientLayer.colors = [colorOne.cgColor, colorTow.cgColor]
    gradientLayer.locations = [0.0, 1.0]
    gradientLayer.endPoint = CGPoint(x: 1.0, y: 1.0)
    gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.0)
    layer.insertSublayer(gradientLayer, at: 0)
  }
  func makeRoundedCorners() {
    self.layer.cornerRadius = (self.frame.width / 2)
    self.layer.masksToBounds = true
  }
  func makeRoundedCorners(by value: Int) {
    self.layer.cornerRadius = CGFloat(value)
    self.layer.masksToBounds = true
  }
}
// Autolayout helpers...