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Showing dictionary definitions using UIReferenceLibraryViewController

Swift version: 5.2

Paul Hudson    @twostraws   

UIKit has a built-in dictionary and a built-in way of showing definitions for that dictionary, all done using UIReferenceLibraryViewController. Before you try using it, you should call its dictionaryHasDefinition() method to make sure a definition exists, like this:

if UIReferenceLibraryViewController.dictionaryHasDefinition(forTerm: "Swift") {
    // code
}

If a definition exists, you create an instance of the view controller using the word you want to show, then present is as normal:

let referenceVC = UIReferenceLibraryViewController(term: "Swift")
present(referenceVC, animated: true)
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