ios - Value of type 'QuerySnapshot' has no member 会出现 'data'错误

Question

Value of type 'QuerySnapshot' has no member 'data' 会出现错误。

但我有麻烦了，因为我不知道为什么。

如果你能给我一位教授，我会很高兴。

private func getTextData(userID: Array<Any>, image: Array<Any>) {
    for user in userID {
        self.db.collection("users").document(self.fireAuthUID).addSnapshotListener { (snapshot3, error) in
            if error != nil {
                return
            } else {
                guard let data = snapshot3?.data() else { return }
                self.teamIDFromFirebase = data["teamID"] as? String ?? ""
                self.db.collection("diary").document(self.teamIDFromFirebase).collection("diaries").addSnapshotListener({ (query, err) in
                    if err != nil {
                        return
                    } else {
                        let doc = query?.data() ←　Value of type 'QuerySnapshot' has no member 'data'

                    }
                })
            }
        }
    }
}

Answer 1

QuerySnapshot 包含文档而不是此处记录的数据 https://firebase.google.com/docs/reference/js/firebase.firestore.QuerySnapshot .

docs

non-null Array of non-null QuerySnapshot

An array of all the documents in the QuerySnapshot.

要简单地从查询中获取文档，请使用 query.docs。在你的情况下 query?.docs