Tap Gesture : give random color to view on tap

ViewController.swift

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        var tapGesture = UITapGestureRecognizer(target: self, action: "tap:")
        
        self.view.addGestureRecognizer(tapGesture)
        
      
        
    }
    
    
    func tap(sender: AnyObject){
        let randomRed : CGFloat = CGFloat(drand48())
        let randomGreen : CGFloat = CGFloat(drand48())
        let randomBlue : CGFloat = CGFloat(drand48())
        self.view.backgroundColor = UIColor(red: randomRed, green: randomGreen, blue: randomBlue, alpha: 1)
    }
    

}