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How to set prompt text in a navigation bar

Swift version: 5.4

Paul Hudson    @twostraws   

You should already know that you can give a title to a navigation controller's bar by setting the title property of your view controllers or a view controller's navigationItem, but did you also know that you can provide prompt text too? When provided, this causes your navigation bar to double in height and show both the title and prompt.

It's easy to do:

navigationItem.title = "Your title text here"
navigationItem.prompt = "Your prompt text here"

Your prompt text appears above your title text, so choose carefully.

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