如何为 PDF 数据提供文件名以供用户在 Swift 中保存

问题描述

我将我的 pdfData 提供给用户保存.他可以保存到文件并制作文件，但pdf文件的默认名称是:PDF document.pdf.如果可能的话，我想要我自己的文件名.也许我可以在将 pdfData 提供给 UIActivityViewController 之前更改 pdfData 中的文件名?

I give my pdfData to user to save. He can save to files and make a file, but the default name of the pdf file is: PDF document.pdf. I want my own filename if this is possible. Perhaps I can change the filename within the pdfData before I give pdfData to UIActivityViewController?

这是我的代码:

// Create page rect
let pageRect = CGRect(x: 0, y: 0, width: 595.28, height: 841.89) // A4, 72 dpi

// Create PDF context and draw
let pdfData = NSMutableData()

UIGraphicsBeginPDFContextToData(pdfData, pageRect, nil)
UIGraphicsBeginPDFPage()

// From here you can draw page, best make it in a function
PdfErstellung.PdfErstellen(auswahlZeilen, vitalstoffWerteListe, heuteString)

UIGraphicsEndPDFContext()

// Save pdf DATA through user
let activityViewController = UIActivityViewController(activityItems: [pdfData], applicationActivities: nil)
activityViewController.popoverPresentationController?.sourceView = self.view // für IPAD nötig
self.present(activityViewController, animated: true, completion: nil)

-- 更新--

我的新想法是，先尝试保存文件并尝试URL，如果失败，则直接使用pdfData，因为在某些模拟器中使用URL不会出错，而在其他情况下会出错.

My new idea ist, first try save the file and try a URL, and if this fail, then use the pdfData directly, because in some simulator use URL give no error and in other give error.

更多信息:https://stackoverflow.com/a/52499637/10392572

推荐答案

您只需将您的 pdfData 保存到一个临时文件 URL 并共享该 URL.

You just need to save your pdfData to a temporary fileURL and share that URL.

let temporaryFolder = FileManager.default.temporaryDirectory
let fileName = "document.pdf"
let temporaryFileURL = temporaryFolder.appendingPathComponent(fileName)
print(temporaryFileURL.path)  // /Users/lsd/Library/Developer/XCPGDevices/E2003834-07AB-4833-B206-843DC0A52967/data/Containers/Data/Application/322D1F1D-4C97-474C-9040-FE5E740D38CF/tmp/document.pdf
do {
    try pdfData.write(to: temporaryFileURL)
    // your code
    let activityViewController = UIActivityViewController(activityItems: [temporaryFileURL], applicationActivities: nil)
} catch {
    print(error)
}

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