CODEWITHSUNDEEP
swiftmacoscocoapdf
benwiggy
benwiggy

Reputation: 2719

Swift 3: PDFDocument crashes

I'm trying to write a simple function that will get the number of pages in a PDF. Every code example I've seen now seems to fail with Swift 3, and whatever Xcode recommends still doesn't work.

func pageCount(filepath: String) -> Int {

    let localUrl  = filepath as CFString
    let pdfDocumentRef = CFURLCreateWithFileSystemPath(nil, localUrl, CFURLPathStyle.cfurlposixPathStyle, false)
    let page_count = (pdfDocumentRef as! CGPDFDocument).numberOfPages

    return page_count
}

And this doesn't work either:

func pageCount(filepath: String) -> Int {

    let url = NSURL(fileURLWithPath: filepath)
    let pdf = CGPDFDocument(url)
    let page_count = pdf?.numberOfPages

    return page_count!
}

Any ideas why?

Upvotes: 1

Views: 721

Answers (2)

benwiggy
benwiggy

Reputation: 2719

It seems that Apple has two PDF Objects: CGPDFDocument, and PDFDocument. The second is much easier to work with.

import Quartz

func NumPages(filename: String) -> Int {

     let pdfDoc = PDFDocument(url: URL(fileURLWithPath: filename))!
    return pdfDoc.pageCount
}

Upvotes: 1

Fahim
Fahim

Reputation: 3556

Modify your code as follows:

func pageCount(filepath: String) -> Int {
    var count = 0
    let localUrl  = filepath as CFString
    if let pdfURL = CFURLCreateWithFileSystemPath(nil, localUrl, CFURLPathStyle.cfurlposixPathStyle, false) {
        if let pdf = CGPDFDocument(pdfURL) {
            let page_count = pdf.numberOfPages
            count = pdf.numberOfPages
        }
    }
    return count
}

Basically, in your code, you were trying to cast a CFURL as a CGPDFDocument and you cannot do that :) You need to create a CGPDFDocument instance from the CFURL. Once you do that, you can get the page count for the PDF document.

Upvotes: 2

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