如何在MACOS中使用Swift将具有PDFActionGoto动作类型的链接注释添加到PDFPage

问题描述

我一直在尝试向我的PDFPage添加链接注释，以便单击后将其带到下一页的特定位置。这是我尝试的方式，但是我的代码无法正常工作：

1. 光标不会更改为指针样式。
2. 单击该区域后，不会进行导航。
3. .freetext注释正在工作并显示。

在此方面，我将不胜感激。最近几天我一直在尝试这种方法。我正在使用最新版本的xcode（12和Swift 5.3）

    let docDirectoryPath = FileManager.default.urls(for: .documentDirectory,in: .userDomainMask)[0]


    let pdfDocument = PDFDocument()
    let page1 = PDFPage()
    let page2 = PDFPage()
    pdfDocument.insert(page1,at: 0)
    pdfDocument.insert(page2,at: 1)
    
    let textAnnotation = PDFAnnotation(bounds: NSRect(x: 200,y: 1000,width: 600,height: 25),forType: .freeText,withProperties: nil)
    textAnnotation.contents = "Click me to go to the next page"
    
    let linkAnnotation = PDFAnnotation(bounds: NSRect(x: 200,forType: .link,withProperties: nil)
    linkAnnotation.action = PDFActionGoTo(destination: PDFDestination(page: page2,at: NSPoint(x: 200,y: 1000)))
    linkAnnotation.shouldDisplay = true
    linkAnnotation.shouldPrint = true

    let someText = PDFAnnotation(bounds: NSRect(x: 200,withProperties: nil)
    someText.contents = "This is the desitnation of link annotation"

    page1.addAnnotation(textAnnotation)
    page1.addAnnotation(linkAnnotation)
    page2.addAnnotation(someText)

    
    let printOpts: [NSPrintInfo.AttributeKey: Any] = [NSPrintInfo.AttributeKey.jobDisposition: NSPrintInfo.JobDisposition.preview,NSPrintInfo.AttributeKey.jobSavingURL: docDirectoryPath]
    
    let printInfo = NSPrintInfo(dictionary: printOpts)
    printInfo.horizontalPagination = NSPrintInfo.PaginationMode.automatic
    printInfo.verticalPagination = NSPrintInfo.PaginationMode.automatic
    printInfo.topMargin = 0.0
    printInfo.leftMargin = 0.0
    printInfo.rightMargin = 0.0
    printInfo.bottomMargin = 0.0
    printInfo.isHorizontallyCentered = true
    printInfo.isVerticallyCentered = false
    printInfo.paperSize = NSSize(width: 8.5*96,height: 11*96)
    printInfo.scalingFactor =  1.0
    let printOperation = pdfDocument.printOperation(for: printInfo,scalingMode: .pageScaleNone,autoRotate: false)!
    printOperation.showsPrintPanel = true
    printOperation.run()

解决方法

经过反复试验，我发现如果文档通过printOperation运行，则linkAnnotation不会保留。因此，我使用“保存”面板将文档保存到文件中。如果单击第一页的绿色区域，将带您到第2页（到达目的地）

    import Foundation
    import PDFKit 
    
    let page1 = PDFPage()
    let page2 = PDFPage()
    
    let link = PDFAnnotation(bounds: NSRect(x: 40,y: 750,width: 200,height: 30),forType: .link,withProperties: nil)
    let highlight = PDFAnnotation(bounds: NSRect(x: 40,forType: .highlight,withProperties: nil)
    highlight.color = .green
    highlight.backgroundColor = .red
    
    let text = PDFAnnotation(bounds: NSRect(x: 40,y: 400,forType: .freeText,withProperties: nil)
    text.contents = "Destination Arrived!"
    link.action = PDFActionGoTo(destination: PDFDestination(page: page2,at: NSPoint(x: 40,y: 430)))
    
    page1.addAnnotation(highlight)
    page1.addAnnotation(link)
    
    page2.addAnnotation(text)
    
    let pdfDoc = PDFDocument()
    pdfDoc.insert(page1,at: 0)
    pdfDoc.insert(page2,at: 1)
    
    let savePanel = NSSavePanel()
    savePanel.title = NSLocalizedString("Save file",comment: "enableFileMenuItems")
    savePanel.nameFieldStringValue = "LinkAnnotation.pdf"
    savePanel.prompt = NSLocalizedString("Save",comment: "enableFileMenuItems")
    savePanel.allowedFileTypes = ["pdf"]
    let fileManager = FileManager.default
    savePanel.begin() { (result2) -> Void in
        if result2 == NSApplication.ModalResponse.OK {
            let fileWithExtensionURL = savePanel.url!
            if fileManager.fileExists(atPath: fileWithExtensionURL.path) {
            } else {
                pdfDoc.write(to: fileWithExtensionURL)
            }
        }
    }