Question

I need convert a CGPDFPageRef var to an integer , I create an if statement that checks if the PDF pages are less or greater than than the file doesn’t show it.

- (id) setUpPDF: (int) pageNumber {    

//** = I need some integer that automatically detects PDF pages
    if ((pageNumber < **) || (pageNumber > **)) return nil;


 CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(),


                                              CFSTR("test"),
                                              CFSTR("pdf"), NULL);


    myDocumentRef = CGPDFDocumentCreateWithURL(pdfURL);
    myPageRef = CGPDFDocumentGetPage(myDocumentRef, pageNumber);

Answer 1

You can get the total number of pages using CGPDFDocumentGetNumberOfPages(myDocumentRef).

CGPDFDocumentGetNumberOfPages() returns a size_t, which is un unsigned integer. You can compare this directly with an integer type.

So for your code snippet above, I assume you want something like:

CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("test"), CFSTR("pdf"), NULL);
myDocumentRef = CGPDFDocumentCreateWithURL(pdfURL);
// take note that pdf page numbering starts at 1
if ((pageNumber < 1) || (pageNumber > CGPDFDocumentGetNumberOfPages(myDocumentRef))) return nil;

I suggest changing your parameter from (int)pageNumber to (size_t)pageNumber though.