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NavigationControllerのToolbarを特定のViewControllerでのみ有効にする

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UIViewController
private lazy var uiButtonItems: [UIBarButtonItem] = {
  // 適当なUIBarButtonItemの配列
  return [...]
}()

// ビュー表示のタイミングでツールバーを表示する
override func viewWillAppear(_ animated: Bool) {
  self.toolbarItems = uiButtonItems
  self.navigationController?.setToolbarHidden(false, animated: false)
}

// ビュー非表示のタイミングで非表示に戻す
override func viewWillDisappear(_ animated: Bool) {
  self.navigationController?.setToolbarHidden(true, animated: false)
  super.viewWillDisappear(animated)    
}
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