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Get notifications for unlocked password-protected PDFs

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If you initialize a PDFViewController with a password-protected document, the documentViewController property is nil until the document is unlocked.

You can implement PDFViewControllerDelegate.pdfViewController(_:didChange:error:) to get the non-nil document view controller when the document is unlocked, like so:

let pdfController = PDFViewController(document: lockedDocument)
pdfController.delegate = self


...


func pdfViewController(_ pdfController: PSPDFViewController, didChange controllerState: PSPDFControllerState, error: Error?) {
    if controllerState == .default {
        if let layout = pdfController.documentViewController?.layout as? ContinuousScrollingLayout {
            layout.fillAlongsideTransverseAxis = true
        }
    }
}