UIColor+Hex

UIColor+Hex.swift

import UIKit

extension UIColor {
  
  static func colorWithHex(hex RGBAHex: String) -> UIColor? {
    
    if !RGBAHex.hasPrefix("#") {
      return nil
    }
    
    let index   = advance(RGBAHex.startIndex, 1)
    let hex     = RGBAHex.substringFromIndex(index)
    let scanner = NSScanner(string: hex)
    
    var hexValue: CUnsignedLongLong = 0
    
    if scanner.scanHexLongLong(&hexValue) {
      
      let r = CGFloat((hexValue >> 24) & 0xFF) / 255
      let g = CGFloat((hexValue >> 16) & 0xFF) / 255
      let b = CGFloat((hexValue >> 8)  & 0xFF) / 255
      let a = CGFloat((hexValue >> 0)  & 0xFF) / 255
      
      return UIColor(red: r, green: g, blue: b, alpha: a)
      
    }
    
    return nil
    
  }
  
}