Navigation bars can take buttons for you to add interactivity. In your challenge, you'll add one to your app.
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/4284-your-second-swift-4-ios-11-app/lessons/23
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/4284-your-second-swift-4-ios-11-app/lessons/23
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