How to add a custom view to a UIBarButtonItem
Swift version: 5.6
Most UIBarButtonItems contain either an icon or some text, but they can do so much more – in fact, you can embed any kind of UIView subclass inside a bar button item, then put that button into a navigation bar or toolbar as you normally would.
For example, you can create a UIProgressView and place it into a bar button like this:
var progressView = UIProgressView(progressViewStyle: .default)
progressView.sizeToFit()
let progressButton = UIBarButtonItem(customView: progressView)
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