How to create UIActionSheet actions?

Question

I know I have to set the delegate (I did so like this: class ShiftOverview: UITableViewController, UIActionSheetDelegate {...) but I'm still getting no response when I tap the buttons.

It doesn't look like you can set the delegate within the function with UIAlertController either...

 @IBAction func takeShift(sender: AnyObject) {

    let myActionSheet = UIAlertController (title: "Confirm", message: "Test message", preferredStyle: UIAlertControllerStyle.ActionSheet)

    let actionOne = UIAlertAction (title: "Take Shift", style: .Default, handler: nil)
    let actionTwo = UIAlertAction (title: "View ESA", style: .Default, handler: nil)

    let actionCancel = UIAlertAction (title: "Cancel", style: .Cancel, handler: nil)

    myActionSheet.addAction(actionOne)
    myActionSheet.addAction(actionTwo)
    myActionSheet.addAction(actionCancel)

    self.presentViewController(myActionSheet, animated: true, completion: nil)
}

func actionSheet (myActionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int)
{
    switch buttonIndex {

    case 0:
        println ("test0")
        break
    case 1:
        println ("test1")
        break
    case 2:
        println ("test2")
        break

    default:
        println("nope")

    }
}

Answer 1

Prior to iOS 8, UIAlertViews and UIActionSheets were separate controls. In iOS 8 however, a new class, UIAlertController, combines both these controls into a single, easy to use class.

Rather than using the delegation pattern like these controls used to, you now pass a closure to be called. The places where you have handler equal to nil is where you put your code.

This is likely added because Swift treats closures as first-class citizens, while Objective C did not as much (with blocks).

It should be:

@IBAction func takeShift(sender: AnyObject) {

    let myActionSheet = UIAlertController (title: "Confirm", message: "Test message", preferredStyle: UIAlertControllerStyle.ActionSheet)

    let actionOne = UIAlertAction (title: "Take Shift", style: .Default, handler: { (action) in
        println("test0")
    })
    let actionTwo = UIAlertAction (title: "View ESA", style: .Default, handler: { (action) in
        println("test1")
    })

    let actionCancel = UIAlertAction (title: "Cancel", style: .Cancel, handler: { (action) in
        println("test2")
    })

    myActionSheet.addAction(actionOne)
    myActionSheet.addAction(actionTwo)
    myActionSheet.addAction(actionCancel)

    self.presentViewController(myActionSheet, animated: true, completion: nil)
}

Read more about this in NSHipster's article on UIAlertControllers or in its documentation.