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【Swift】親のView, ViewControllerを取得する

親のViewやViewControllerを取得する方法

私はUIViewの拡張クラスを作成しています。

UIView+.swift
import UIKit

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

    func parentView<T: UIView>(type: T.Type) -> T? {
        var parentResponder: UIResponder? = self
        while true {
            guard let nextResponder = parentResponder?.next else { return nil }
            if let view = nextResponder as? T {
                return view
            }
            parentResponder = nextResponder
        }
    }
}

使い方

if let parentVC = self.parentViewController() as? 〇〇ViewController 

}
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