How to programmatically replace UIToolBar items built in IB

Question

I have a toolbar with various image buttons, created in Interface Builder.

I\'d like to be able to programmatically replace one of the buttons with an activity indic

Answer 1

Swift has a much easier way. In my case, I am switching the play button with the pause button every touch.

@IBAction func playandPause(sender: UIBarButtonItem) { // Here we are creating an outlet. Hook this up to the bar button item.
    for (index, button) in toolbarItems!.enumerate() { // Enumerating through all the buttons
        if button === sender { // === operator is used to check if the two objects are the exact same instance in memory.
            var barButtonItem: UIBarButtonItem!
            if mediaplayer.playing {
                mediaplayer.pause()
                barButtonItem = UIBarButtonItem.init(barButtonSystemItem: .Play, target: self, action: #selector(playandPause(_:)))
            }else {
                mediaplayer.play()
                barButtonItem = UIBarButtonItem.init(barButtonSystemItem: .Pause, target: self, action: #selector(playandPause(_:)))
            }
            toolbarItems![index] = barButtonItem // Replace the old item with the new item.
            break // Break once we have found the button as it is unnecessary to complete the rest of the loop
        }
    }
}

Answer 2

A note on this - the toolbar will strip out any color in your icons, so you still won't be able to make it yellow. You'll need to change the image shape to indicate "on" instead.

Alternatively you'll need to load your BarButtonItems with UIButtons (use the initWithCustomView) and set the image of the button appropriately.

HTH