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.

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