[iOS] random Color

+ (UIColor*) randomColor
{
    float red   = arc4random() % 256;
    float green = arc4random() % 256;
    float blue  = arc4random() % 256;
  
    return [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:1.0];
}