iOS PDF 替换一页

1、把PDF厡文件拆开

- (void)splitPdfDataAndWriteToFile

{

    for (NSInteger i = 1; i <= maximumPage; i++) {

        NSMutableData* outputPDFData = [[NSMutableData alloc] init];

        CGDataConsumerRef dataConsumer =           CGDataConsumerCreateWithCFData((CFMutableDataRef)outputPDFData);

        CFMutableDictionaryRef attrDictionary = NULL;

        attrDictionary = CFDictionaryCreateMutable(NULL, 0,       &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

        CFDictionarySetValue(attrDictionary, kCGPDFContextTitle, CFSTR("My Doc"));

        CGContextRef pdfContext = CGPDFContextCreate(dataConsumer, NULL, attrDictionary);

        CFRelease(dataConsumer);

        CFRelease(attrDictionary);

        CGRect pageRect;

        // Draw the old "pdfData" on pdfContext

        CFDataRef myPDFData = (__bridge CFDataRef) [NSData dataWithContentsOfURL:document.fileURL];

      CGDataProviderRef provider =         CGDataProviderCreateWithCFData(myPDFData);

        CGPDFDocumentRef pdf = CGPDFDocumentCreateWithProvider(provider);

CGDataProviderRelease(provider);

        CGPDFPageRef page = CGPDFDocumentGetPage(pdf, i);

        pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);

        CGContextBeginPage(pdfContext, &pageRect);

        CGContextDrawPDFPage(pdfContext, page);

        // release the allocated memory

        CGPDFContextEndPage(pdfContext);

        CGPDFContextClose(pdfContext);

        CGContextRelease(pdfContext);

        // write new PDFData in "outPutPDF.pdf" file in document directory

        NSString *pdfFilePath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/%@/filePages/outPutPDF_%ld.pdf",kDataProcessingPdf, (long)i];

        [outputPDFData writeToFile:pdfFilePath atomically:YES];

    }

}

2、上一篇文章 iOS PDF 添加图片会生成一页新的PDF 根据要替换的页码覆盖对应的文件

3、把所有页码的PDF再拼接到一起 形成一个新的PDF文件

/**
 整合 PDF 文件

 @param listOfPaths listOfPaths  需要整和文件路径数组
 @param pdfPathOutput 整合后的文件输出
 @return 整合后的文件输出
 */

- (NSString *)joinPDF:(NSArray *)listOfPaths pdfPathOutput:(NSString *)pdfPathOutput{

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

    NSInteger numberOfPages = 0;

    CGContextRef writeContext = CGPDFContextCreateWithURL(pdfURLOutput, NULL, NULL);

    for (NSString *source in listOfPaths) {

        CFURLRef pdfURL = (  CFURLRef)CFBridgingRetain([[NSURL alloc] initFileURLWithPath:source]);

        CGPDFDocumentRef pdfRef =     CGPDFDocumentCreateWithURL((CFURLRef) pdfURL);

        numberOfPages = CGPDFDocumentGetNumberOfPages(pdfRef);

        CGPDFPageRef page;

        CGRect mediaBox;

        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);

    CGPDFContextClose(writeContext);

    CGContextRelease(writeContext);

    return pdfPathOutput;

}

完结

这总方式个人感觉比较笨拙 但是还没有找到更好的方法 （在免费的接口里面）

如果有人知道更便捷的方式 希望可以给我留言 我也研究一下

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