The provided code snippet appears to be an incorrect representation of a `UINavigationController` class. The properties and methods included do not match those found in the actual Swift documentation or Apple's official API.

Displaying a UIBarButtonItem without Using a UIToolBar or Making it Invisible

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Customizing UINavigationBar Appearance without Spaces in iOS

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Understanding and Resolving iOS Push Notification Issues with AdHoc Certificates

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Dismissing a Modal View Controller from a UITabBarController: Understanding the Root Cause of the Problem and Finding a Solution