UIView extension to find a specific UIViewController type in responder chain. And UIView extension to find specific UIView subclass in view hierarchy toward superview.

UIView+Find.swift

// UIView+Find.swift
//
// Copyright (c) 2016 Kaz Yoshikawa. Released under MIT License.

extension UIView {

	func findViewController<T: UIViewController>() -> T? {
		var responder = self.nextResponder()
		while responder != nil {
			if let viewController = responder as? T {
				return viewController
			}
			responder = responder!.nextResponder()
		}
		return nil
	}

	func findView<T: UIView>() -> T? {
		var view = self.superview
		while view != nil {
			if let view = view as? T {
				return view
			}
			view = view!.superview
		}
		return nil
	}

}

Usage:
let myViewController = view.findViewController() as? MyViewController
let myView = view.findView() as? MyView

Article about this code:
http://qiita.com/codelynx/items/d77f991aa5fb07374ef7
in Japanese