Obtain location of UIButton press in swift

Question

I have several drumpads set up on my view and they all connect to a drumPadPlay IBAction method. I would like to determine the y-axis location of the user's press inside the sender button to adjust the volume the drum pad will play at. I'm using swift.

Before this is flagged as a duplicate question I have referenced this question and the solution did not work for the current version of swift, or perhaps I don't know what to put where the answer says "buttonView". Detect what is the location of the tap/press inside UIButton inside sender action method

@IBAction func drumPadPressed(sender: BNDrumPad, event: UIEvent) {

    //...code for function here

    // get any touch on the buttonView
    if let touch = event.touchesForView(sender.)?.anyObject() as? UITouch {
        // print the touch location on the button
        println(touch.locationInView(buttonView))
    }

    //...more code for function here
}

Here is my code - the error is "use of unresolved identifier 'buttonView'" I don't know what to use for buttonView. I have tried sender.superview! and searched through sender's list of properties/functions and couldn't find anything that looked like it would help.

The answer you linked to is correct. Perhaps you could edit your question to show the code you tried and the error/problem you have. — Paulw11, Jan 23 '16 at 20:17
I edited the question to include the code example. I have a feeling it's such a simple answer the other answer assumed it would be known what to replace buttonView with but I can't figure it out. — evansjohnson, Jan 23 '16 at 21:13

score 1 · Accepted Answer · answered Jan 23 '16 at 21:18

sender is a BNDrumPad which is (presumably) a subclass of a UIView, so in this case you will just use sender. In the answer you linked to, the sender parameter was defined as AnyObject so they had to cast it to a UIView first.

@IBAction func drumPadPressed(sender: BNDrumPad, event: UIEvent) {

    //...code for function here

    // get any touch on the buttonView
    if let touch = event.touchesForView(sender)?.anyObject() as? UITouch {
        // print the touch location on the button
        println(touch.locationInView(buttonView))
    }

    //...more code for function here
}

Obtain location of UIButton press in swift

1 Answers1