Traverse View Hierarchy Upwards

UIView+Hierarchy.swift

extension UIView {
    func findFirstSuperview<T>(ofClass viewClass: T.Type, where predicate: (T) -> Bool) -> T? where T: UIView {
        var view: UIView? = self
        while view != nil {
            if let typedView = view as? T, predicate(typedView) {
                break
            }

            view = view?.superview
        }

        return view as? T
    }
}

Isn't it a little imprecise that this method can return the view it was called on, when the name explicitly says "superview"?

Neat. You can leave out the ofClass viewClass: T.Type:

func findFirstSuperview<T>(where predicate: (T) -> Bool) -> T? where T: UIView {

and just supply the type in the predicate:

foo.findFirstSuperview { (v: UIScrollView) -> Bool in