Podofo iOS版写入PDF文件后,“找不到目录对象”

我已经为iOS构建了Podofo 0.9.3以及所有其他需要的库来支持amrv7,arm64和模拟器.我的项目运行正常,但我的问题是第二次加载文档.我总是在Podofo中收到错误“Catalog object not found”.如果我使用Mac上的Preview app打开文档,并保存它,Podofo可以再次打开它.

以下是我用来打开文档并保存的代码：

self.doc = new PodoFo::PdfMemDocument([path UTF8String]);

Nsstring *tmpPath = [self createcopyForFile:self.pdfPath];

self.doc->Write([tmpPath UTF8String]);

NSData *myFile = [NSData dataWithContentsOfFile:tmpPath];
[myFile writetoFile:tmpPath atomically:YES];

NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;

if ([fileManager fileExistsAtPath:self.pdfPath] == YES) {
     [fileManager removeItemAtPath:self.pdfPath error:&error];
}
[fileManager copyItemAtPath:tmpPath toPath:self.pdfPath error:&error];

错误在这里：

void PdfMemDocument::InitFromParser( PdfParser* pParser )
{
...
PdfObject* pCatalog = pTrailer->GetIndirectKey( "Root" );
if( !pCatalog )
{
      PodoFO_RAISE_ERROR_INFO( ePdfError_NoObject,"Catalog object not found!" );
...
}

你们最近是否为iOS建立了Podofo？任何想法为什么会发生这种情况？

- (Nsstring *)filePathWithoutCacheDirectoryComponent:(Nsstring *)fullPath {
    Nsstring *cacheDirectoryPath =
        NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES)[0];
    return [fullPath stringByReplacingOccurrencesOfString:cacheDirectoryPath withString:@""];
}

Nsstring *cacheDirectoryPath =
        NSSearchPathForDirectoriesInDomains(NSCachesDirectory,YES)[0];
fullPath = [cacheDirectoryPath stringByAppendingPathComponent:savedpathToFile];