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[Swift] UIViewから親のViewControllerを取得するためのExtension

Last updated at Posted at 2016-10-03

Problem

  • UIViewから、自分を配置しているViewControllerを取得する

Solution

以下のようにUIViewのprotocol extensionを作成する

UIView+Extension.swift

extension UIView {
    var parentViewController: UIViewController? {
        get {
            var parentResponder: UIResponder? = self
            while true {
                guard let nextResponder = parentResponder?.next else { return nil }
                if let viewController = nextResponder as? UIViewController {
                    return viewController
                }
                parentResponder = nextResponder
            }
        }
    }
}

Reference

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