Get coordinates of multiple touches in Swift

Question

So I've been messing around trying to get the coordinates of touches on the screen. So far I can get the coordinates of one touch with this:

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    let touch = touches.anyObject()! as UITouch
    let location = touch.locationInView(self.view)
    println(location)
}

But when touching with two fingers I only get the coordinates of the first touch. Multi-touch works (I tested with this little tutorial: http://www.techotopia.com/index.php/An_Example_Swift_iOS_8_Touch,_Multitouch_and_Tap_Application). So my question is, how do I get the coordinates of the second (and third, fourth...) touch?

Answer 1

** Updated to Swift 4 and Xcode 9 (8 Oct 2017) **

First of all, remember to enable multi-touch events by setting

self.view.isMultipleTouchEnabled = true

in your UIViewController's code, or using the appropriate storyboard option in Xcode:

Otherwise you'll always get a single touch in touchesBegan (see documentation here).

Then, inside touchesBegan, iterate over the set of touches to get their coordinates:

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in touches {
        let location = touch.location(in: self.view)
        print(location)
    }
}

Answer 2

the given touches argument is a set of detected touches. You only see one touch because you select one of the touches with :

touches.anyObject() // Selects a random object (touch) from the set

In order to get all touches iterate the given set

for obj in touches.allObjects {
   let touch = obj as UITouch
   let location = touch.locationInView(self.view)
   println(location)
}

Answer 3

You have to iterate over the different touches. That way you can access every touch.

for touch in touches{
  //Handle touch
  let touchLocation = touch.locationInView(self.view)
}