在iOS上合并PDF文件

时间：2011-07-01 21:48:57

标签： iphone ios cocoa-touch ipad pdf

在iOS中是否有办法合并PDF文件，即将一个页面附加到另一个页面并将其保存到磁盘？

8 个答案:

答案 0 :(得分：23)

我对Jonathan的代码进行了一些重构，以加入任何大小的PDF文件：

+ (NSString *)joinPDF:(NSArray *)listOfPaths {
    // File paths
    NSString *fileName = @"ALL.pdf";
    NSString *pdfPathOutput = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:fileName];

    CFURLRef pdfURLOutput = (  CFURLRef)CFBridgingRetain([NSURL fileURLWithPath:pdfPathOutput]);

    NSInteger numberOfPages = 0;
    // Create the output context
    CGContextRef writeContext = CGPDFContextCreateWithURL(pdfURLOutput, NULL, NULL);

    for (NSString *source in listOfPaths) {
        CFURLRef pdfURL = (  CFURLRef)CFBridgingRetain([[NSURL alloc] initFileURLWithPath:source]);

        //file ref
        CGPDFDocumentRef pdfRef = CGPDFDocumentCreateWithURL((CFURLRef) pdfURL);
        numberOfPages = CGPDFDocumentGetNumberOfPages(pdfRef);

        // Loop variables
        CGPDFPageRef page;
        CGRect mediaBox;

        // Read the first PDF and generate the output pages
        DLog(@"GENERATING PAGES FROM PDF 1 (%@)...", source);
        for (int i=1; i<=numberOfPages; i++) {
            page = CGPDFDocumentGetPage(pdfRef, i);
            mediaBox = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
            CGContextBeginPage(writeContext, &mediaBox);
            CGContextDrawPDFPage(writeContext, page);
            CGContextEndPage(writeContext);
        }

        CGPDFDocumentRelease(pdfRef);
        CFRelease(pdfURL);
    }
    CFRelease(pdfURLOutput);

    // Finalize the output file
    CGPDFContextClose(writeContext);
    CGContextRelease(writeContext);

    return pdfPathOutput;
}

希望有所帮助

答案 1 :(得分：21)

我出来了这个解决方案：

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

// File paths
NSString *pdfPath1 = [documentsDirectory stringByAppendingPathComponent:@"1.pdf"];
NSString *pdfPath2 = [documentsDirectory stringByAppendingPathComponent:@"2.pdf"];
NSString *pdfPathOutput = [documentsDirectory stringByAppendingPathComponent:@"out.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(@"GENERATING 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(@"GENERATING 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);

这里最大的问题是内存分配。如您所见，在这种方法中，您必须同时读取要合并的两个PDF文件，同时生成输出。版本只发生在最后。我尝试将一个PDF文件与500页（约15MB）组合在一起，另一个包含100页（约3MB），它生成了一个600页（当然！）的新文件，大小只有~5MB（魔术？）。执行花了大约30秒（考虑到iPad 1，并没有那么糟糕）并分配了17MB（哎哟！）。该应用程序幸运地没有崩溃，但我认为iOS会喜欢杀死像这样消耗17MB的应用程序。 ; P

答案 2 :(得分：4)

我在swift 3中的功能：

// sourcePdfFiles is array of source file full paths, destPdfFile is dest file full path
func mergePdfFiles(sourcePdfFiles:[String], destPdfFile:String) {

    guard UIGraphicsBeginPDFContextToFile(destPdfFile, CGRect.zero, nil) else {
        return
    }
    guard let destContext = UIGraphicsGetCurrentContext() else {
        return
    }

    for index in 0 ..< sourcePdfFiles.count {
        let pdfFile = sourcePdfFiles[index]
        let pdfUrl = NSURL(fileURLWithPath: pdfFile)
        guard let pdfRef = CGPDFDocument(pdfUrl) else {
            continue
        }

        for i in 1 ... pdfRef.numberOfPages {
            if let page = pdfRef.page(at: i) {
                var mediaBox = page.getBoxRect(.mediaBox)
                destContext.beginPage(mediaBox: &mediaBox)
                destContext.drawPDFPage(page)
                destContext.endPage()
            }
        }
    }

    destContext.closePDF()
    UIGraphicsEndPDFContext()
}

答案 3 :(得分：2)

我在这里推广我自己的图书馆...但我有一个免费的PDF阅读/写作库，我最近展示了如何在iOS上下文中使用。它非常适合合并PDF并对其进行操作，并且使用相对较小的内存签名来完成。考虑使用它，请参见此处的示例 - ios with PDFHummus。再一次，我是在推广我自己的图书馆，所以请在正确的背景下接受这个建议。

答案 4 :(得分：2)

我以为我使用Swift分享答案，因为我在Swift中寻找它并且无法找到它并且不得不翻译它。此外，我的回答使用每个单独的pdfs pdfPagesURLArray的数组并循环生成完整的pdf。我对此很新，所以欢迎任何建议。

    let file = "fileName.pdf"
    guard var documentPaths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first else {
        NSLog("Doh - can't find that path")
        return
    }
    documentPaths = documentPaths.stringByAppendingString(file)
    print(documentPaths)

    let fullPDFOutput: CFURLRef = NSURL(fileURLWithPath: documentPaths)

    let writeContext = CGPDFContextCreateWithURL(fullPDFOutput, nil, nil)

    for pdfURL in pdfPagesURLArray {
        let pdfPath: CFURLRef = NSURL(fileURLWithPath: pdfURL)
        let pdfReference = CGPDFDocumentCreateWithURL(pdfPath)
        let numberOfPages = CGPDFDocumentGetNumberOfPages(pdfReference)
        var page: CGPDFPageRef
        var mediaBox: CGRect

        for index in 1...numberOfPages {

可以像这样强行展开：                 page = CGPDFDocumentGetPage(pdfReference, index)! 但要继续最佳实践：

        guard let getCGPDFPage = CGPDFDocumentGetPage(pdfReference, index) else {
                NSLog("Error occurred in creating page")
                return
            }
            page = getCGPDFPage
            mediaBox = CGPDFPageGetBoxRect(page, .MediaBox)
            CGContextBeginPage(writeContext, &mediaBox)
            CGContextDrawPDFPage(writeContext, page)
            CGContextEndPage(writeContext)
        }
    }
    NSLog("DONE!")

    CGPDFContextClose(writeContext);

    NSLog(documentPaths)

答案 5 :(得分：1)

我的解决方案基于@matsoftware创建的解决方案。

我为我的解决方案创建了一个代码段：https://gist.github.com/jefferythomas/7265536 

+ (void)combinePDFURLs:(NSArray *)PDFURLs writeToURL:(NSURL *)URL
{
    CGContextRef context = CGPDFContextCreateWithURL((__bridge CFURLRef)URL, NULL, NULL);

    for (NSURL *PDFURL in PDFURLs) {
        CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((__bridge CFURLRef)PDFURL);
        size_t numberOfPages = CGPDFDocumentGetNumberOfPages(document);

        for (size_t pageNumber = 1; pageNumber <= numberOfPages; ++pageNumber) {
            CGPDFPageRef page = CGPDFDocumentGetPage(document, pageNumber);
            CGRect mediaBox = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);

            CGContextBeginPage(context, &mediaBox);
            CGContextDrawPDFPage(context, page);
            CGContextEndPage(context);
        }

        CGPDFDocumentRelease(document);
    }

    CGPDFContextClose(context);
    CGContextRelease(context);
}

答案 6 :(得分：1)

快捷键5：

合并这样的pdf可以保留链接等... 

func mergePdf(data: Data, otherPdfDocumentData: Data) -> PDFDocument {
    // get the pdfData
    let pdfDocument = PDFDocument(data: data)!
    let otherPdfDocument = PDFDocument(data: otherPdfDocumentData)!
    
    // create new PDFDocument
    let newPdfDocument = PDFDocument()

    // insert all pages of first document
    for p in 0..<pdfDocument.pageCount {
    let page = pdfDocument.page(at: p)!
        newPdfDocument.insert(page, at: newPdfDocument.pageCount)
    }

    // insert all pages of other document
    for q in 0..<otherPdfDocument.pageCount {
        let page = otherPdfDocument.page(at: q)!
        newPdfDocument.insert(page, at: newPdfDocument.pageCount)
    }
    return newPdfDocument
}
在PDFView中

显示您的mergedPdf：

    // show merged pdf in pdfView
    PDFView.document = newPdfDocument

保存您的pdf文件。 首先像这样转换newPdfDocument：

let documentDataForSaving = newPdfDocument.dataRepresentation()

将documentDataForSaving放在以下函数中： 使用保存功能：

let urlWhereTheFileIsSaved = writeDataToTemporaryDirectory(withFilename: "My File Name", inFolder: nil, data: documentDataForSaving)

可能您想避免 /的文件名，并且长度不能超过256个字符

保存功能： 

// Export PDF to directory, e.g. here for sharing
    func writeDataToTemporaryDirectory(withFilename: String, inFolder: String?, data: Data) -> URL? {
        do {
            // get a directory
            var temporaryDirectory = FileManager.default.temporaryDirectory // for e.g. sharing
            // FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last! // to make it public in user's directory (update plist for user access) 
            // FileManager.default.urls(for: .libraryDirectory, in: .userDomainMask).last! // to hide it from any user interactions) 
            // do you want to create subfolder?
            if let inFolder = inFolder {
                temporaryDirectory = temporaryDirectory.appendingPathComponent(inFolder)
                if !FileManager.default.fileExists(atPath: temporaryDirectory.absoluteString) {
                    do {
                        try FileManager.default.createDirectory(at: temporaryDirectory, withIntermediateDirectories: true, attributes: nil)
                    } catch {
                        print(error.localizedDescription);
                    }
                }
            }
            // name the file
            let temporaryFileURL = temporaryDirectory.appendingPathComponent(withFilename)
            print("writeDataToTemporaryDirectory at url:\t\(temporaryFileURL)")
            try data.write(to: temporaryFileURL)
            return temporaryFileURL
        } catch {
            print(error)
        }
        return nil
    }

答案 7 :(得分：0)

我相信FastPdfKit正是您所寻找的，并且有免费版本！

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