how do i pass a selected parameter into swift?

It is simpler to use block, like

private var _observer: Any!  // unsubscribed automatically on deinit

func addObserver(_ scrollView: UIScrollView) {
    _observer = NotificationCenter.default.addObserver(forName: name, 
                object: nil, queue: nil) { notification in
        // ... just use scrollView here
    }
}

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