Swift 3: PDF text search on macOS returns page labels (numbers) as strings

PDFSearch.swift

import Cocoa
import Quartz

enum SearchType: Int {
    case CaseInsensitiveSearch = 1, LiteralSearch, BackwardsSearch, AnchoredSearch, NumericSearch
}

extension PDFDocument {
    func pages(withString str:String, searchType type:SearchType) -> [String] {
        let selec = self.findString(str, withOptions: type.rawValue)
        var arrayOfPages = [String]()
        for s in selec {
            for p in s.pages {
                let pageIndex = self.index(for:p)
                let page = self.page(at:pageIndex)
                if let label = page?.label {
                    arrayOfPages.append(label)
                }
                
            }
        }
        return arrayOfPages
    }
}
guard let url = Bundle.main.url(forResource: "myPDF", withExtension: "pdf") else {
    fatalError()
}
let pdf = PDFDocument(url: url)
pdf?.pages(withString: "Your search text here", searchType: .CaseInsensitiveSearch)