pdf showing Lines with pdf file

[donjin123]

at the time of loading pdf from URL Border will be displayed.
i attached code snippet here.
let pdf = PDFDocument(url: URL(string: urlFromData)!) {
pdfView = PDFDrawingView(frame: holdingView.bounds, document: pdf, style: .vertical, delegate: self)
holdingView.addSubview(pdfView)
}