Summarize code for the three presentation experiments

@IBAction func experiment() {
let controller = UIImagePickerController()
self.presentViewController(controller, animated: true, completion: nil)
}

@IBAction func experiment() {
let image = UIImage()
let controller = UIActivityViewController(activityItems: [image], applicationActivities: nil)
self.presentViewController(controller, animated: true, completion: nil)
}

@IBAction func experiment() {
let controller = UIAlertController()
controller.title = "Test alert"
controller.message = "This is a test"

// Dismiss the view controller after the user taps “ok”
let okAction = UIAlertAction (title:"ok", style: UIAlertActionStyle.Default) {
action in self.dismissViewControllerAnimated(true, completion: nil)
}
controller.addAction(okAction)
self.presentViewController(controller, animated: true, completion:nil)
}