小编hea*_*che的帖子

import UIKit\nimport PDFKit\n\nclass ViewController: UIViewController {\n\n    @IBOutlet weak var pdfView: PDFView!\n\n    lazy var pdfDoc:PDFDocument? = {\n        guard let path = Bundle.main.path(forResource: "6368", ofType: "pdf") else {return nil}\n        let url = URL(fileURLWithPath: path)\n        return PDFDocument(url: url)\n    }()\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        self.setupPDFView()\n        self.save()\n    }\n\n    func setupPDFView() {\n        //Setup and put pdf on view\n        pdfView.autoScales = true\n        pdfView.displayMode = .singlePageContinuous\n        pdfView.displayDirection = .horizontal\n        pdfView.document = pdfDoc\n\n        self.add(annotation: self.circleAnnotation(), to: 0)\n    }\n\n    func add(annotation: PDFAnnotation, to page:Int){\n        self.pdfDoc?.page(at: page)?.addAnnotation(annotation)\n    }\n\n    func circleAnnotation()->PDFAnnotation …