Swift: PDFDocument write

Question

Swift seems to have changed again and I'm having trouble making this code work:

   let pdf_url = URL(fileURLWithPath: filename)
   let pdf_doc = PDFDocument.init(url: pdf_url)
   let value = "Bibbly"
   let diction = [kCGPDFContextCreator : value ] as Any

   pdf_doc!.write(toFile: filename, withOptions: (diction as [PDFDocumentWriteOption : Any]))

I get the following error: 'CFString' is not convertible to 'Any'.

Anyone know what the problem is? The API reference is here:

https://developer.apple.com/documentation/pdfkit/pdfdocument/1436053-write

Answer 1

As in the API reference, the type of withOptions parameter is [PDFDocumentWriteOption : Any], so declaring your diction as Any is not a good idea.

let diction: [PDFDocumentWriteOption : Any] = [kCGPDFContextCreator : value]

With this line of code, Xcode has given me a suggestion:

'CFString' is not implicitly convertible to 'PDFDocumentWriteOption'; did you mean to use 'as' to explicitly convert?

So, I have Fix-ed it by accepting the suggestion:

let pdf_url = URL(fileURLWithPath: filename)
if let pdf_doc = PDFDocument(url: pdf_url) {
    let value = "Bibbly"
    let diction: [PDFDocumentWriteOption : Any] = [kCGPDFContextCreator as PDFDocumentWriteOption : value]

    pdf_doc.write(toFile: filename, withOptions: diction)
} else {
    print("PDF document at: \(filename) cannot be opened!")
    //...
}

This code compiles without problems.