Converting a rawValue into a string in Swift

Question

Apple has made changes from Swift 3 to 4. When I run the following code:

let metadata = [ PDFDocumentAttribute.titleAttribute,

                 PDFDocumentAttribute.authorAttribute,

                 PDFDocumentAttribute.subjectAttribute,

                 PDFDocumentAttribute.creatorAttribute,

                 PDFDocumentAttribute.producerAttribute,

                 PDFDocumentAttribute.creationDateAttribute,

                 PDFDocumentAttribute.modificationDateAttribute,

                 PDFDocumentAttribute.keywordsAttribute ]



if var attributes = pdfDoc.documentAttributes {



    for (index, value) in metadata.enumerated() {

        if attributes[value] != nil {



            print("\(metadata[index])): \(String(describing: attributes[value]!))")

        }    else {

            print("\(metadata[index]): nil")

        }

    }

I now get: PDFDocumentAttribute(_rawValue: Title) instead of "Title", which I got before as the value of

metadata[index]

.

How do I get rid of the rawValue stuff?

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Answer 1

The PDFDocumentAttribute type has a property called rawValue that contains the old string value. So you can say

print("\(metadata[index].rawValue): \(String(describing: attributes[value]!))")

As an aside, instead of force-unwrapping the attribute you can use an if let, as in

if let attr = attributes[value] {
    print("\(metadata[index].rawValue): \(attr)")
} else {
    print("\(metadata[index].rawValue): nil")
}

Converting a rawValue into a string in Swift

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