对于新的PDFKit，

For new PDFKit,

您需要导入PDFKit

然后创建一个PDFView视图，并提供一个PDFDocument来查看该视图的文档.检查以下代码以供参考.

Then create a view of PDFView and give a PDFDocument to view's document. Check the below code for reference.

let pdfView = PDFView(frame: self.view.bounds)
let url = Bundle.main.url(forResource: "pdfFile", withExtension: "pdf")
pdfView.document = PDFDocument(url: url!)
self.view.addSubview(pdfView)