我可以检索收入集合中所有金额的总和，但无法根据登录用户提供的数据进行检索。

下面是我的代码：

func calculatedAmount() {
    let firestoreDatabase = Firestore.firestore()
    
    if let currentUser = Auth.auth().currentUser {
        let currentUserID = currentUser.uid
        
        let userIncomeCollection = firestoreDatabase.collection("incomes").whereField("userID", isEqualTo: currentUserID)
        
        userIncomeCollection.getDocuments { (snapshot, error) in
            if let error = error {
                print("Hata: \(error.localizedDescription)")
            } else {
                var totalAmount = 1

                for document in snapshot!.documents {
                    if  let amount = document.get("amount") as? Int {
                        totalAmount += amount
                    }
                }

                self.mainAccountLabel.text = "\(totalAmount)"
            }
        }
    }
}