UIViewExtensions.swift

import UIKit

extension UIView {
    var superviews: UnfoldFirstSequence<UIView> {
        return sequence(first: self) { view in view.superview }
    }

    func enclosingView(where predicate: (UIView) -> Bool) -> UIView? {
        return superviews.first(where: predicate)
    }

    func enclosingView<T>(type: T.Type) -> T? where T: UIView {
        return superviews.first(where: { $0 is T }) as! T?
    }
}