iPhoneiPad 上的 PDF 超链接

在iPhone和iPad上，我们可以使用PDF超链接来实现更丰富的文档交互体验。PDF超链接允许我们在PDF文档中添加链接，使读者可以通过点击链接跳转到其他页面、网址或者执行特定的操作。接下来，我们将介绍如何在iPhone和iPad上使用PDF超链接，并提供一些案例代码作为演示。

swift
import PDFKit

swift
let pdfView = PDFView()
let pdfDocument = PDFDocument(url: pdfURL)
pdfView.document = pdfDocument
let linkURL = URL(string: "https://www.example.com")!
let linkRect = CGRect(x: 100, y: 100, width: 200, height: 50)
let linkAnnotation = PDFAnnotation(url: linkURL, with: linkRect)
pdfDocument.addAnnotation(linkAnnotation)

swift
class ViewController: UIViewController, PDFViewDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        pdfView.delegate = self
    }
    
    func pdfViewWillClick(onLink sender: PDFView, with url: URL) {
        if url.absoluteString == "https://www.example.com" {
            UIApplication.shared.open(url)
        }
    }
}

swift
let pdfView = PDFView()
let pdfDocument = PDFDocument(url: pdfURL)
pdfView.document = pdfDocument
let linkURL1 = URL(string: "https://www.example1.com")!
let linkRect1 = CGRect(x: 100, y: 100, width: 200, height: 50)
let linkAnnotation1 = PDFAnnotation(url: linkURL1, with: linkRect1)
pdfDocument.addAnnotation(linkAnnotation1)
let linkURL2 = URL(string: "https://www.example2.com")!
let linkRect2 = CGRect(x: 100, y: 200, width: 200, height: 50)
let linkAnnotation2 = PDFAnnotation(url: linkURL2, with: linkRect2)
pdfDocument.addAnnotation(linkAnnotation2)
// 监听超链接点击事件
class ViewController: UIViewController, PDFViewDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        pdfView.delegate = self
    }
    
    func pdfViewWillClick(onLink sender: PDFView, with url: URL) {
        if url.absoluteString == "https://www.example1.com" {
            UIApplication.shared.open(url)
        } else if url.absoluteString == "https://www.example2.com" {
            UIApplication.shared.open(url)
        }
    }
}