如何在Swift 3中從Firebase中刪除特定密鑰

Question

如何獲取標記的鍵，然后將其從UITableView swift 3中刪除？

override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {

        if editingStyle == .delete {

            self.grocery.remove(at: indexPath.row)
            self.tableView.deleteRows(at: [indexPath], with: .automatic)
        }
    }

Answer 1

要刪除，您只需將值設置為nil即可將其從firebase中刪除。 調用remove函數之后，請確保從tableView中刪除該行。

func removeObjectFromFireBase(userKey: String, removeThisGrocery: String) {
    let ref = Database.database().reference()
    let groceryRef = ref.child("Users").child(userKey).child("Grocery")
    groceryRef.child(removeThisObject).setValue(nil)
}

func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
    let deleteAction = UITableViewRowAction(style: .destructive, title: "DELETE") { (rowAction, indexPath) in

        //Call the removeFromFirebase function with the required parameters
        removeObjectFromFirebase(userKey: userKey, removeThisGrocery: groceryKey)
        tableView.deleteRows(at: [indexPath], with: .automatic)
    }

    deleteAction.backgroundColor = UIColor.red
    return [deleteAction, addAction]
}

Answer 2

您可以按以下方式從Firebase中刪除任何數據：

let ref = Database.database().reference()
let groceryRef = ref.child("Users").child(userKey).child("Grocery")
groceryRef.removeValue()