Enabling and disabling buttons in xcode - swift

Question

For a given simple audio app with a few buttons:
The button references inside ViewController is:
#IBOutlet weak var recordAudioButton: UIButton!
#IBOutlet weak var playAudioButton: UIButton!
#IBOutlet weak var processAudioButton: UIButton!
But where are those button names and references inside the xcode gui? Notice below that the Allow Recording button is highlighted: but there is no mention of recordAudioButton as a button name:
I want to modify the enabling/disabling logic of a different button that does not have a reference yet.. but can not see how/where to do that . The dialog does not show a way to view/change the button references. So where is the place to do that?

Answer 1

See in Referencing Outlets Section for each button.
You can set disable after buttons setup
#IBOutlet weak var recordAudioButton: UIButton! {
didSet { recordAudioButton.isEnabled = false }
}
#IBOutlet weak var playAudioButton: UIButton! {
didSet { playAudioButton.isEnabled = false }
}
#IBOutlet weak var processAudioButton: UIButton! {
didSet { processAudioButton.isEnabled = false }
}
Then in viewDidLoad check for permission
AVAudioSession.sharedInstance().requestRecordPermission() { [unowned self] allowed in
DispatchQueue.main.async {
self.recordAudioButton.isEnabled = allowed
self.playAudioButton.isEnabled = allowed
self.processAudioButton.isEnabled = allowed
}
}
Then your code
#IBAction func askForPermissions() {
recordingSession = AVAudioSession.sharedInstance()
do {
try recordingSession.setCategory(.playAndRecord, mode: .default)
try recordingSession.setActive(true)
recordingSession.requestRecordPermission() { [unowned self] allowed in
// UI related work has to be executed on main thread(queue)
DispatchQueue.main.async {
self.recordAudioButton.isEnabled = allowed
self.playAudioButton.isEnabled = allowed
self.processAudioButton.isEnabled = allowed
}
}
} catch let error {
presentError(withMessage: error.localizedDescription)
}
}

Answer 2

You just defined the button as an outlet. So it does not appear on the Touch Up Inside, it appears at outlets area. But you connect your other button to an action function, this button appears on the Touch Up Inside.

Answer 3

Given the starting point / hint from #Picode here is what I was missing to get a new UIButton reference. A Medium article helped pave the way https://medium.com/#GanChau/outlet-vs-action-connections-in-xcode-b5331fb233a1 . In particular we need to have both an Editor and the Visual Designer showing:
So on my project now I control-clicked on the new button Run DSP and the context menu shows up:
Now select New Referencing Outlet and connect it to the ViewController code:
I typed in dspJsButton for the Name and we get the following code generated:
#IBOutlet weak var dspJsButton: UIButton!