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Swift NavigationController 戻るボタンイベント 検知

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環境

  • MacOS Big Sur 11.6
  • Xcode 13.0
  • Swift 5.5

シンプルにこれで。

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    guard let viewControllers = navigationController?.viewControllers, !viewControllers.contains(self) else { return }

    // 実行したい処理など
    NotificationCenter.default.removeObserver(self)
}
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