【最終課題】エラー画面作成

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XIB使ってカスタムViewを表示 - Qiita https://qiita.com/sachiko-kame/items/ed81817a83e174e16bea XIBからViewを生成する4つの実装パターン - Qiita https://qiita.com/marty-suzuki/items/7c7ecdcb1f16c21b0051

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ios - Add fullscreen view as subview of view controller - Stack Overflow https://stackoverflow.com/questions/52050206/add-fullscreen-view-as-subview-of-view-controller ios - Swift addsubview and remove it - Stack Overflow https://stackoverflow.com/questions/28197079/swift-addsubview-and-remove-it

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uitableview - UISearchController in a UIViewController - Stack Overflow https://stackoverflow.com/questions/26417591/uisearchcontroller-in-a-uiviewcontroller UINavigationBar | Appleデベロッパドキュメント https://developer.apple.com/documentation/uikit/uinavigationbar