Ios7 MFMailComposeViewController的addAttachmentData在iOS 7下是否已损坏？

我有一个应用程序，它使用以下代码创建带附件的应用内邮件：

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];

其中通过创建attachmentData

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];

mime类型是通过

    /*
     * 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";

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该代码在iOS 4、iOS 5、iOS 6下正常工作。但是，在iOS 7.0下，附件丢失。这是一个iOS错误还是上述代码的问题？

您使用什么“mimetype”？“…mime类型“application/octet stream”在ios 7设备上不工作。它完全忽略附件。”在我的测试用例中，mime类型是text/html。我使用“代码”来推断正确的mime类型。我将更新我的问题。谢谢Vegar。行为确实取决于mime类型：application/zip工作。“text/html”不起作用。