UIColor extensions for hex color

UIColor+Ext.swift

extension UIColor {

  public convenience init(hex: UInt32) {
      let mask = 0x000000FF

      let r = Int(hex >> 16) & mask
      let g = Int(hex >> 8) & mask
      let b = Int(hex) & mask

      let red   = CGFloat(r) / 255
      let green = CGFloat(g) / 255
      let blue  = CGFloat(b) / 255

      self.init(red:red, green:green, blue:blue, alpha:1)
  }
  
  public class var background: UIColor { return UIColor(hex: 0x000000) }

}