Search ancestral view hierarchy for a given `UIView` type.

UIView+Extensions.swift

extension UIView {
    
    /// Search ancestral view hierarchy for the given view type.
    func searchViewAnchestorsFor<ViewType: UIView>(
        _ onViewFound: (ViewType) -> Void
    ) {
        if let matchingView = self.superview as? ViewType {
            onViewFound(matchingView)
        } else {
            superview?.searchViewAnchestorsFor(onViewFound)
        }
    }
}

// Usage.
view.searchViewAnchestorsFor { (scrollView: UIScrollView) in
    // Do something with the scroll view.
}