在目标c中将文件作为附件发送

#import <MessageUI/MessageUI.h>

- (void)sendEmailWithAttachment:(NSString *)filePath {
    if (![MFMailComposeViewController canSendMail]) {
        NSLog(@"设备不支持发送邮件");
        return;
    }
    
    MFMailComposeViewController *mailComposeVC = [[MFMailComposeViewController alloc] init];
    mailComposeVC.mailComposeDelegate = self;
    [mailComposeVC setSubject:@"邮件主题"];
    [mailComposeVC setMessageBody:@"邮件正文" isHTML:NO];
    
    NSData *fileData = [NSData dataWithContentsOfFile:filePath];
    NSString *fileName = [filePath lastPathComponent];
    [mailComposeVC addAttachmentData:fileData mimeType:@"application/octet-stream" fileName:fileName];
    
    [self presentViewController:mailComposeVC animated:YES completion:nil];
}

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    if (result == MFMailComposeResultSent) {
        NSLog(@"邮件发送成功");
    } else if (result == MFMailComposeResultCancelled) {
        NSLog(@"邮件发送取消");
    } else if (result == MFMailComposeResultFailed) {
        NSLog(@"邮件发送失败");
    }
    
    [controller dismissViewControllerAnimated:YES completion:nil];
}