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如何将PDF放入NSData？我在应用程序的文档目录中将PDF的位置作为字符串.当我尝试通过电子邮件发送时,我会在电子邮件正文中看到PDF(与查看附件图标相比.我不知道这是否正常).但是当我在另一端收到电子邮件时,它没有PDF扩展名.我究竟做错了什么？谢谢.

NSString *documentsDirectory = [self GetURLForPDF]; // I know this name is bad since it is really a NSString
NSLog(@"DocumentsDirectory: %@", documentsDirectory);
NSString *pdfName = [NSString stringWithFormat:@"%@/%@.pdf", documentsDirectory, title];
NSLog(@"pdfName: %@", pdfName);
NSData *pdfData = [NSData dataWithContentsOfFile:pdfName];
[mailComposer addAttachmentData:pdfData mimeType:@"application/pdf" fileName:title];    
[self presentModalViewController:mailComposer animated:YES];