Swift UIColor utilities : Random Hex colour codes, Random UIColor

Simple to use swift functions which are very useful in development and testing.

1. Generating random UIColor in Swift: Function returns random UIColor each time

func randomUIColor(alpha:CGFloat!)-> UIColor
{
    return  UIColor.init(red:(CGFloat(arc4random_uniform(256))/255.0), green:CGFloat(arc4random_uniform(256))/255.0, blue: (CGFloat(arc4random_uniform(256))/255.0), alpha: alpha)
}

2.Random HEX Color code in Swift 3: Function returns random 3 char Hex colour code each time.

func randomHexColorCode() -> String{
    let a = ["1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];
    return "#".appending(a[Int(arc4random_uniform(15))]).appending(a[Int(arc4random_uniform(15))]).appending(a[Int(arc4random_uniform(15))])
}

3.UIColor from HEX Color code(Updated) : Function takes in a 3 char hex code with or without # in string format and returns a UIColor.This function comes in handy to directly generate UIColor from hex code

func colorFromHexString(_ hexCode:String!)->UIColor{
    let scanner = Scanner(string:hexCode)
    scanner.charactersToBeSkipped = CharacterSet(charactersIn: "$+#")
    var hex: CUnsignedLongLong = 0
    if(!scanner.scanHexInt64(&hex)) { return UIColor() }
    let r = (hex >> 16) & 0xFF;
    let g = (hex >> 8) & 0xFF;
    let b = (hex) & 0xFF;
    return UIColor.init(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: 1)
}