将pdf页面添加到现有pdf objective-c

Question

我正在为iphone/ipad编写应用程序，将相机图像（.png）转换为pdf并保存到/ user/documents文件夹。现在我试图找出如何将另一个pdf附加到现有文档，以使它们成为多页。基本上，如果您将doc1.pdf和doc2.pdf保存在文档文件夹中，那么您如何合并这两个pdf使其成为一个包含两页的文档？

感谢任何帮助或建议，你们可以给我。

感谢，

Answer 1

下面是在另一个附加一个PDF格式的样本代码：

// Documents dir 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 

// File paths 
NSString *pdfPath1 = [documentsDirectory stringByAppendingPathComponent:@"pdf1.pdf"]; 
NSString *pdfPath2 = [documentsDirectory stringByAppendingPathComponent:@"pdf2.pdf"]; 
NSString *pdfPathOutput = [documentsDirectory stringByAppendingPathComponent:@"pdfout.pdf"]; 

// File URLs 
CFURLRef pdfURL1 = (CFURLRef)[[NSURL alloc] initFileURLWithPath:pdfPath1]; 
CFURLRef pdfURL2 = (CFURLRef)[[NSURL alloc] initFileURLWithPath:pdfPath2]; 
CFURLRef pdfURLOutput = (CFURLRef)[[NSURL alloc] initFileURLWithPath:pdfPathOutput]; 

// File references 
CGPDFDocumentRef pdfRef1 = CGPDFDocumentCreateWithURL((CFURLRef) pdfURL1); 
CGPDFDocumentRef pdfRef2 = CGPDFDocumentCreateWithURL((CFURLRef) pdfURL2); 

// Number of pages 
NSInteger numberOfPages1 = CGPDFDocumentGetNumberOfPages(pdfRef1); 
NSInteger numberOfPages2 = CGPDFDocumentGetNumberOfPages(pdfRef2); 

// Create the output context 
CGContextRef writeContext = CGPDFContextCreateWithURL(pdfURLOutput, NULL, NULL); 

// Loop variables 
CGPDFPageRef page; 
CGRect mediaBox; 

// Read the first PDF and generate the output pages 
NSLog(@"Pages from pdf 1 (%i)", numberOfPages1); 
for (int i=1; i<=numberOfPages1; i++) { 
    page = CGPDFDocumentGetPage(pdfRef1, i); 
    mediaBox = CGPDFPageGetBoxRect(page, kCGPDFMediaBox); 
    CGContextBeginPage(writeContext, &mediaBox); 
    CGContextDrawPDFPage(writeContext, page); 
    CGContextEndPage(writeContext); 
} 

// Read the second PDF and generate the output pages 
NSLog(@"Pages from pdf 2 (%i)", numberOfPages2); 
for (int i=1; i<=numberOfPages2; i++) { 
    page = CGPDFDocumentGetPage(pdfRef2, i); 
    mediaBox = CGPDFPageGetBoxRect(page, kCGPDFMediaBox); 
    CGContextBeginPage(writeContext, &mediaBox); 
    CGContextDrawPDFPage(writeContext, page); 
    CGContextEndPage(writeContext); 
} 
NSLog(@"Done"); 

// Finalize the output file 
CGPDFContextClose(writeContext); 

// Release from memory 
CFRelease(pdfURL1); 
CFRelease(pdfURL2); 
CFRelease(pdfURLOutput); 
CGPDFDocumentRelease(pdfRef1); 
CGPDFDocumentRelease(pdfRef2); 
CGContextRelease(writeContext); 

Source