如何在 swift iOS Firestore 中获取单元格文档 ID？

Question

下面是我正在处理的代码，有用于 cmets 列表的 tableview 和 tablecells，当我单击单元格中的按钮时，如何从 firestore 获取单元格的文档 ID。它没有显示错误，但没有按要求执行，基本上在单击时我想同时检索评论 ID 和帖子 ID，正在检索帖子 ID，但每个评论的评论 ID 相同，这必须是每个评论的差异。

我收到此错误消息“'NSInvalidArgumentException'，原因：'-[UITableViewCellContentView addTarget:action:forControlEvents:]: unrecognized selector sent to instance 0x7fc1a1659400'”。

class CommentListViewController: UITableViewController {
    var comments = [Comment]()
    var postCommentList:Post?
    var postId:String = ""
    var commentKey:String = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationController?.navigationBar.isTranslucent = false
        getComments()
    }

    func getComments() {
        let commentsRef = Firestore.firestore().collection("posts").document(postId).collection("comments")
        commentsRef.getDocuments { (snapshot, error) in
            if let error = error {
                print(error.localizedDescription)

            } else {
                if let snapshot = snapshot {
                    for document in snapshot.documents {
                        let data = document.data()
                        let username = data["comment_author_username"] as? String ?? ""
                        let comment = data["comment_author_comment"] as? String ?? ""
                        let spinnerC = data["comment_author_spinnerC"] as? String ?? ""
                        let fullname = data["comment_author_fullname"] as? String ?? ""
                        let email = data["comment_author_email"] as? String ?? ""
                        let commentUserImageUrl = data["comment_user_image"] as? String ?? ""
                        let newComment = Comment(_documentId: document.documentID, _commentAuthorUsername: username, _commentAuthorFullName: fullname, _commentAuthorComment: comment, _commentUserImage: commentUserImageUrl, _commentAuthorSpinnerC: spinnerC)
                        self.comments.append(newComment)

                    }
                    self.tableView.reloadData()
                }
            }
        }
    }

    @IBAction func toAddCommentsSection(_ sender: Any) {
        performSegue(withIdentifier: "toPostComment", sender: self)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        let vc = segue.destination as! CommentPostViewController
        vc.postId2 = postId
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return comments.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CommentCell", for: indexPath) as! CommentCell
        cell.likebutton.tag = indexPath.row
        cell.likebutton.addTarget(self, action: #selector(likeaction1(_:)), for: .touchUpInside)
        cell.set(comment: comments[indexPath.row])

        return cell
    }

    @IBAction func likeaction1(_ sender: AnyObject) {
        let commentbutton = sender as! UIButton
        let comment = comments[commentbutton.tag]
        commentKey = comment._documentId // or what key value it is
        print(postId + "   hello1  " + commentKey)
    }
}

Answer 1

试试这个，让我知道它是否有效。制作这样的按钮

class CommentCell: UITableViewCell {

@IBOutlet weak var likeButton: UIButton!

var likeButtonPressed : (() -> ()) = {}


override func awakeFromNib() {
    super.awakeFromNib()
}


@IBAction func likeButtonTapped(_ sender: UIButton) {

    likeButtonPressed()
}


}

在 UITableView cellForRowAt 方法内部

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CommentCell", for: indexPath) as! CommentCell

cell.likeButtonPressed = {
    commentKey = comments._documentId[indexPath.row]

}

return cell


}