如何以编程方式在iOS中将PDF拆分为单独的单页PDF

Question

要求是将PDF拆分为单个页面，仅将单个文件保留为.pdf扩展名。 在/ CreatedPDF文件夹中创建的文件未打开

请帮助解决/纠正此问题。

//"fileURL" is the original File which has to be broken
//"pages" is the number of pages in PDF
NSInteger pages = CGPDFDocumentGetNumberOfPages(pdfDocReference);

for (int page = 1; page <= pages; page++)
 {
   NSFileManager *fm = [NSFileManager defaultManager];
   NSString *dirName = [documentsDirectory stringByAppendingPathComponent:@"/CreatedPDF"];
   [fm createDirectoryAtPath:dirName withIntermediateDirectories:YES attributes:nil error:nil];
   NSString *pdfPath = [dirName stringByAppendingPathComponent:[NSString stringWithFormat:@"page_%d.pdf",page]];
   NSURL *pdfUrl = [NSURL fileURLWithPath:pdfPath];

   CGContextRef context = CGPDFContextCreateWithURL((__bridge_retained CFURLRef)pdfUrl, NULL, NULL);

   CGPDFDocumentRef pdfDoc = CGPDFDocumentCreateWithURL((__bridge_retained CFURLRef)fileURL);
   CGPDFPageRef pdfPage = CGPDFDocumentGetPage(pdfDoc, 1);
   CGRect pdfCropBoxRect = CGPDFPageGetBoxRect(pdfPage, kCGPDFMediaBox);

   // Copy the page to the new document
   CGContextBeginPage(context, &pdfCropBoxRect);
   CGContextDrawPDFPage(context, pdfPage);
   // Close the source files
   CGContextEndPage(context);
   CGPDFDocumentRelease(pdfDoc);
}

Answer 1

我错过了一行代码，因为我们还要释放CGContext，所以在循环中只需添加行，其余所有代码都可以工作。

CGContextRelease (context);