如何使用Cocoa(Mac)在Swift中创建PDF

Question

Xcode 7.3.2,Swift 2,Cocoa(Mac).

我的应用程序涉及用户输入一些文本,可以导出为PDF.

在我的应用程序的iOS版本中,我可以使用CoreText框架相对轻松地创建PDF :

let html = "<font face=\'Futura\' color=\"SlateGray\"><h2>\(title)</h2></font><font face=\"Avenir\" color=\"SlateGray\"><h4>\(string)</h4></font>"

    let fmt = UIMarkupTextPrintFormatter(markupText: html)

    // 2. Assign print formatter to UIPrintPageRenderer

    let render = UIPrintPageRenderer()
    render.addPrintFormatter(fmt, startingAtPageAt: 0)

    // 3. Assign paperRect and printableRect

    let page = CGRect(x: 10, y: 10, width: 595.2, height: 841.8) // A4, 72 dpi, margin of 10 from top and left.
    let printable = page.insetBy(dx: 0, dy: 0)

    render.setValue(NSValue(cgRect: page), forKey: "paperRect")
    render.setValue(NSValue(cgRect: printable), forKey: "printableRect")

    // 4. Create PDF context and draw

    let pdfData = NSMutableData()
    UIGraphicsBeginPDFContextToData(pdfData, CGRect.zero, nil)

    for i in 1...render.numberOfPages {

        UIGraphicsBeginPDFPage();
        let bounds = UIGraphicsGetPDFContextBounds()
        render.drawPage(at: i - 1, in: bounds)
    }

    UIGraphicsEndPDFContext();

    // 5. Save PDF file

    path = "\(NSTemporaryDirectory())\(title).pdf"
    pdfData.write(toFile: path, atomically: true)

然而UIMarkupTextPrintFormatter,UIPrintPageRenderer,UIGraphicsBeginPDFContextToData,和UIGraphicsEndPDFContext所有人都不在OS X上我如何能做到同样的事情,就像我跟这个iOS的代码做(一些HTML创建一个基本的PDF文件,并写入到一个特定的文件路径作为分页PDF存在)与Mac和Cocoa？

编辑:在回答这个问题是在这里:创建一个分页PDF的Mac OS X.

Answer 1

这是一个将从纯HTML生成PDF的函数.

func makePDF(markup: String) {
    let directoryURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
    let printOpts: [NSPrintInfo.AttributeKey: Any] = [NSPrintInfo.AttributeKey.jobDisposition: NSPrintInfo.JobDisposition.save, NSPrintInfo.AttributeKey.jobSavingURL: directoryURL]
    let printInfo = NSPrintInfo(dictionary: printOpts)
    printInfo.horizontalPagination = NSPrintingPaginationMode.AutoPagination
    printInfo.verticalPagination = NSPrintingPaginationMode.AutoPagination
    printInfo.topMargin = 20.0
    printInfo.leftMargin = 20.0
    printInfo.rightMargin = 20.0
    printInfo.bottomMargin = 20.0

    let view = NSView(frame: NSRect(x: 0, y: 0, width: 570, height: 740))

    if let htmlData = markup.dataUsingEncoding(NSUTF8StringEncoding) {
        if let attrStr = NSAttributedString(HTML: htmlData, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil) {
            let frameRect = NSRect(x: 0, y: 0, width: 570, height: 740)
            let textField = NSTextField(frame: frameRect)
            textField.attributedStringValue = attrStr
            view.addSubview(textField)

            let printOperation = NSPrintOperation(view: view, printInfo: printInfo)
            printOperation.showsPrintPanel = false
            printOperation.showsProgressPanel = false
            printOperation.run()
        }
    }
}

怎么了:

1. 将HTML放入NSAttributedString中.
2. 将NSAttributedString呈现给NSTextField.
3. 将NSTextField呈现为NSView.
4. 使用该NSView创建NSPrintOperation.
5. 将打印参数设置为另存为PDF.
6. 运行打印操作(实际打开一个对话框以保存PDF)
7. 每个人都很开心.

这不是一个完美的解决方案.注意硬编码的整数值.