How do you obtain the frame of a UIBarButtonItem?

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You can obtain the frame of a UIBarButtonItem by using the following steps:

1. Get a reference to the UIBarButtonItem object.

2. Get a reference to the view of the UIBarButtonItem object using the value(forKey:) method and passing in the "view" key.

3. Use the convertRect(_:toView:) method on the view object to get the frame of the UIBarButtonItem object in the coordinate system of the specified view.

Here is an example code snippet:

if let barButtonItem = navigationItem.rightBarButtonItem {
    if let view = barButtonItem.value(forKey: "view") as? UIView {
        let frame = view.convert(view.bounds, to: self.view)
        print(frame)
    }
}

This code snippet will print the frame of the right bar button item in the coordinate system of the current view.