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在 iOS 6 系统上启动 MFMailComposeViewController 实例时，我偶尔会看到以下错误。在 iOS 5 上一切正常，它只在 iOS 6 上发生：

* 由于未捕获的异常“NSGenericException”而终止应用程序，原因：“* Collection [__NSArrayM: ...] 在枚举时发生了变异。”

错误发生在启动视图控制器的 viewWillDisappear() 函数被调用之后。

有没有其他人遇到过这个问题或遇到过修复？

谢谢！

代码很标准，但我还是把它包括在内：

-(IBAction)doEmailLog:(id)sender 
{    
    if( [self canSendMail] )
    {       
        // create the compose message view controller
        MFMailComposeViewController* mailComposer = [[MFMailComposeViewController alloc] init];

        // this class will handle the cancel / send results
        mailComposer.mailComposeDelegate = self;

        // fill in the header and body
        [mailComposer setSubject:@"My Subject"];
        [mailComposer setMessageBody:@"My message body" isHTML:NO];

        // attach log file
        if ([[NSFileManager defaultManager] fileExistsAtPath:filename])
        { 
            NSData *data = [NSData dataWithContentsOfFile:filename];
            [mailComposer addAttachmentData:data mimeType:@"text/plain" fileName:filename];
        }

        // show the view controller
        [self presentViewController:mailComposer animated:YES completion:^{LogTrace(@"Presented mail view controller");}];
    }
    else
    {
        ...
    }
}

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    ...

    // dismiss the compose message view controller
    [self dismissViewControllerAnimated:YES completion:^{LogTrace(@"Finished dismissing mail controller");}];
}
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