How to change the icon of a Bar Button when pressed in Swift?

Question

I\'m creating a stopwatch in Swift and I want to change the play icon I have selected for a bar button to a pause icon when the button is pressed to start the stopwatch. How do

Answer 1

You can not change a UIBarButtonItem's style during runtime. You must remove the UIBarButtonItem and then add the UIBarButtonItem you'd like.

@IBOutlet weak var toolBar: UIToolbar!
var pauseButton = UIBarButtonItem()
var playButton = UIBarButtonItem()
var arrayOfButtons = [AnyObject]()

override func viewDidLoad() {
    super.viewDidLoad()
    pauseButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Pause, target: self, action: "pauseButtonTapped")
    playButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Play, target: self, action: "playButtonTapped")

    arrayOfButtons = self.toolBar.items!
    arrayOfButtons.insert(playButton, atIndex: 0) // change index to wherever you'd like the button
    self.toolBar.setItems(arrayOfButtons, animated: false)
}

func playButtonTapped() {
    arrayOfButtons = self.toolBar.items!
    arrayOfButtons.removeAtIndex(0) // change index to correspond to where your button is
    arrayOfButtons.insert(pauseButton, atIndex: 0)
    self.toolBar.setItems(arrayOfButtons, animated: false)
}

func pauseButtonTapped() {
    arrayOfButtons = self.toolBar.items!
    arrayOfButtons.removeAtIndex(0) // change index to correspond to where your button is
    arrayOfButtons.insert(playButton, atIndex: 0)
    self.toolBar.setItems(arrayOfButtons, animated: false)
}

UIBarButtonItem Class Reference