Crash on DidSet from external XIB

I have an external XIB that is @IBDesignable. Inside the view that shows this XIB, I have this outlet.

  @IBOutlet weak var digitizingButton: DigitizingButton! {
    didSet {
      digitizingButton.buttonIsBeingTouched = {[weak self] in
        // bla bla
      }
    }
  }

crash on

digitizingButton.buttonIsBeingTouched = {[weak self] in

EXC_BAD_ACCESS (code 2)

DigitizingButton loads like this:

 required init?(coder decoder: NSCoder) {
    super.init(coder: decoder)
    self.loadViewFromNib()
  }

  override init(frame: CGRect) {
    super.init(frame: frame)
    self.loadViewFromNib()
  }


  /** Loads instance from nib with the same name. */
  func loadViewFromNib() {
    let bundle = Bundle(for: type(of: self))
    let nib = UINib(nibName: .init(String(describing: type(of: self))), bundle: bundle)

    let myView = nib.instantiate(withOwner: self, options: nil)[0] as! UIView

    self.view = myView
    self.addSubview(myView)
  }

Any ideas what is going on? Thanks in advance.

Try to change the approach of your initialization.

Add an IBOutlet from the first view of your xib file to the swift file:

@IBOutlet var containerView: UIView!

Then edit your loadViewFromBib method as follow:

  func loadViewFromNib() {
    Bundle.main.loadNibNamed("DigitizingButton", owner: self, options: nil)
    addSubview(containerView)
    containerView.frame = self.bounds
    containerView.autoresizingMask = [.flexibleHeight, .flexibleWidth]

    // Other initialization here
  }