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我有一个应用程序，它使用以下代码创建带有附件的应用程序内邮件：

MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
[controller setMailComposeDelegate:self];
[controller setToRecipients:recipient != nil ? [NSArray arrayWithObject:recipient] : nil];
[controller setSubject:subject];
[controller setMessageBody:body isHTML:isHTML];

[controller addAttachmentData:attachmentData mimeType:attachmentType fileName:attachmentFileName];

附件数据是通过哪里创建的

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

// build the file name using the documents directory:
NSString *fileName = [NSString stringWithFormat:@"%@/%@", documentsDirectory, attachmentFileName];

NSData *attachmentData = [NSData dataWithContentsOfFile:fileName];

一个 mime 类型是通过推断的

    /*
     * Infer the mime type
     */
    NSString* attachmentMimeType = nil;
    @try {
        NSString* fullPath = [fileName stringByExpandingTildeInPath];
        NSURL* fileUrl = [NSURL fileURLWithPath:fullPath];
        NSURLRequest* fileUrlRequest = [NSURLRequest requestWithURL:fileUrl];

        NSError* error = nil;
        NSURLResponse* response = nil;
        [NSURLConnection sendSynchronousRequest:fileUrlRequest returningResponse:&response error:&error];

        attachmentMimeType = [response MIMEType];
    }
    @catch (NSException * e) {
        // Test
    }
    @finally {
    }

    /*
     * Default mime type is application/octet-stream
     */
    if(attachmentMimeType == nil) attachmentMimeType = @"application/octet-stream";

该代码在 iOS 4、iOS 5、iOS 6 下按预期工作。但是，在 iOS 7.0 下，附件丢失。这是iOS错误还是上述代码的问题？

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