xcode - How to make a UIImageView tappable and cause it to do something? (Swift)

Question

(I just started using Swift a few days ago and am relatively new to programming, so please bear with me.) I am trying to make random blocks appear on the screen, and the user must tap them to make them disappear. I have been able to create the blocks, but I have no idea how to actually make them tappable. Can someone please help me? This is my code so far:

func createBlock(){

    let imageName = "block.png"
    let image = UIImage(named: imageName)
    let imageView = UIImageView(image: image!)

    imageView.frame = CGRect(x: xPosition, y: -50, width: size, height: size)
    self.view.addSubview(imageView)



    UIView.animateWithDuration(duration, delay: delay, options: options, animations: {

        imageView.backgroundColor = UIColor.redColor()

        imageView.frame = CGRect(x: self.xPosition, y: 590, width: self.size, height: self.size)

        }, completion: { animationFinished in


            imageView.removeFromSuperview()


    })



}

Edit: This is the new code I am trying:

func createBlock(){


    let imageName = "block.png"
    let image = UIImage(named: imageName)
    let imageView = UIImageView(image: image!)

    imageView.frame = CGRect(x: xPosition, y: -50, width: size, height: size)
    self.view.addSubview(imageView)

    imageView.userInteractionEnabled = true
    let tapRecognizer = UITapGestureRecognizer(target: self, action: Selector("imageTapped"))
    imageView.addGestureRecognizer(tapRecognizer)

    func imageTapped(gestureRecognizer: UITapGestureRecognizer) {
        let tappedImageView = gestureRecognizer.view!
        tappedImageView.removeFromSuperview()
        score += 10
    }



    UIView.animateWithDuration(duration, delay: delay, options: options, animations: {

        imageView.backgroundColor = UIColor.redColor()
        imageView.frame = CGRect(x: self.xPosition, y: 590, width: self.size, height: self.size)

        }, completion: { animationFinished in


            imageView.removeFromSuperview()


    })



}

Answer 1

Once you've create the view, you need to set it's userInteractionEnabled property to true. Then you need to attach a gesture to it.

imageView.userInteractionEnabled = true
//now you need a tap gesture recognizer
//note that target and action point to what happens when the action is recognized.
let tapRecognizer = UITapGestureRecognizer(target: self, action: Selector("imageTapped:"))
//Add the recognizer to your view.
imageView.addGestureRecognizer(tapRecognizer)

Now you still need the function, in this case imageTapped:, which is where the action happens when the gesture is recognized. The gesture that was recognized will be sent as an argument, and you can find out which imageView was tapped from they gestures view property.

func imageTapped(gestureRecognizer: UITapGestureRecognizer) {
    //tappedImageView will be the image view that was tapped.
    //dismiss it, animate it off screen, whatever.
    let tappedImageView = gestureRecognizer.view!
}