ios - IOS writeToFile 只写文件的一部分

Question

使用下面的代码，我成功编写了 pdf，但不是所有文件！我可以看到文件是 3 页，但只有一页在写。有谁知道为什么？

(PresentationItem*)presentationItemFromDictionary:(NSDictionary*)dict {

if (dict == nil) return nil;

CGPDFDocumentRef document = [self newPdfDocumentFromBase64DataString:[dict objectForKey:@"base64"]];

NSString *tempName = [dict objectForKey:@"name"];

// Create the pdf context
CGPDFPageRef page = CGPDFDocumentGetPage(document, 1);
CGRect pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);
CFMutableDataRef mutableData = CFDataCreateMutable(NULL,0);

CGDataConsumerRef dataConsumer = CGDataConsumerCreateWithCFData(mutableData);
CGContextRef pdfContext = CGPDFContextCreate(dataConsumer, &pageRect, NULL);

if(CGPDFDocumentGetNumberOfPages(document) > 0){
    // Draw the page onto the new context
    CGPDFContextBeginPage(pdfContext, NULL);
    CGContextDrawPDFPage(pdfContext, page);
    CGPDFContextEndPage(pdfContext);
}
else{
    NSLog(@"Failed to create the document");
}

CGContextRelease(pdfContext);

// Write to disk

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex:0];


NSString *fileName = [NSString stringWithFormat:@"%@/%@.pdf", docDir,tempName];
[(__bridge NSData *)mutableData writeToFile:fileName atomically:YES];

PresentationItem *item = [[PresentationItem alloc] init];
[item setTitle:[dict objectForKey:@"name"]];
[item setDocument:document];
CGPDFDocumentRelease(document);
CGDataConsumerRelease(dataConsumer);
CFRelease(mutableData);
return item;
}

Answer 1

试试这个：

检查此代码..它将迭代所有页面并将每个页面写入pdfContext。然后保存文件。

    if (dict == nil) return nil;

    NSString *tempName = [dict objectForKey:@"name"];

    CGPDFDocumentRef document = [self newPdfDocumentFromBase64DataString:[dict objectForKey:@"base64"]];

    CGPDFPageRef page;

    CFURLRef pdfURLOutput = (CFURLRef)[[NSURL alloc] initFileURLWithPath:YOUR_OUTPUT_FULL_FILE_PATH];

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

    CGRect pageRect;

    for (int i=1; i<=CGPDFDocumentGetNumberOfPages(document); i++)
    {
         page = CGPDFDocumentGetPage(document, i);

         pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox);

         CGContextBeginPage(pdfContext, &pageRect);

         CGContextDrawPDFPage(pdfContext, page);

         CGContextEndPage(pdfContext);
    }

    CGContextRelease(pdfContext);
   // Write to disk

     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *docDir = [paths objectAtIndex:0];


     NSString *fileName = [NSString stringWithFormat:@"%@/%@.pdf", docDir,tempName];
     [(__bridge NSData *)mutableData writeToFile:fileName atomically:YES];

     PresentationItem *item = [[PresentationItem alloc] init];
     [item setTitle:[dict objectForKey:@"name"]];
     [item setDocument:document];
     CGPDFDocumentRelease(document);
     CGDataConsumerRelease(dataConsumer);
     CFRelease(mutableData);
     return item;