UIColor Hex Parser

UIColorHex.swift

extension UIColor{
  convenience init(hex: String, alpha: CGFloat = 1.0){
        
        var hex_copy = hex;
        let count = hex.count;
        
        if (count != 6 && count != 7){
            self.init();
            return;
        }
        
        if (count == 7){
            hex_copy.removeFirst();
        }
        
        // FFFFFF - FF FF FF
        
        let r_s : String = "\(hex_copy[0])\(hex_copy[1])";
        let g_s : String = "\(hex_copy[2])\(hex_copy[3])";
        let b_s : String = "\(hex_copy[4])\(hex_copy[5])";
        
        //print("hex - \(r_s)\(g_s)\(b_s)")
        
        guard let r = UInt8(r_s, radix: 16) else{
            self.init();
            return;
        }
        
        guard let g = UInt8(g_s, radix: 16) else{
            self.init();
            return;
        }
        
        guard let b = UInt8(b_s, radix: 16) else{
            self.init();
            return;
        }
        
        self.init(red: CGFloat(Double(r)/255.0), green: CGFloat(Double(g)/255.0), blue: CGFloat(Double(b)/255.0), alpha: alpha);
        
    } 
}