无法从UIAlertController打开邮件撰写视图控制器

- (void)sendEmail {
    if ([MFMailComposeViewController canSendMail]) {
        MFMailComposeViewController *mailComposeVC = [[MFMailComposeViewController alloc] init];
        mailComposeVC.mailComposeDelegate = self;
        [mailComposeVC setToRecipients:@[@"recipient@example.com"]];
        [mailComposeVC setSubject:@"邮件主题"];
        [mailComposeVC setMessageBody:@"邮件正文" isHTML:NO];
        
        // 添加附件
        NSData *attachmentData = UIImagePNGRepresentation([UIImage imageNamed:@"attachment.png"]);
        [mailComposeVC addAttachmentData:attachmentData mimeType:@"image/png" fileName:@"attachment.png"];
        
        [self presentViewController:mailComposeVC animated:YES completion:nil];
    } else {
        // 当设备没有设置邮件账户时的处理逻辑
        NSLog(@"设备不支持发送邮件");
    }
}

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    switch (result) {
        case MFMailComposeResultCancelled:
            NSLog(@"邮件发送取消");
            break;
        case MFMailComposeResultSaved:
            NSLog(@"邮件保存成功");
            break;
        case MFMailComposeResultSent:
            NSLog(@"邮件发送成功");
            break;
        case MFMailComposeResultFailed:
            NSLog(@"邮件发送失败");
            break;
        default:
            break;
    }
    
    [controller dismissViewControllerAnimated:YES completion:nil];
}