ios - 值保留在数组内部

Question

我正在创建一个功能，根据用户在“firstLocation”、“secondLocation”、“thirdLocation”中设置的值来显示用户特定的人员。我正在检查所有 Firebase 用户，过滤并提取任何匹配的帐户。这就是我要做的事情

func fetchUser(){
    FIRDatabase.database().reference().child("Users").observe(.childAdded, with: {(snapshot) in
        if let dictionary = snapshot.value as? [String: AnyObject]{
            let user = User()
            user.id = snapshot.key
            user.setValuesForKeys(dictionary)
            user.name = dictionary["name"] as! String?
            user.aboutMe = dictionary["aboutMe"] as! String?
            user.profileImageUrl = dictionary["profileImageUrl"] as! String?
            user.firstLocation = dictionary["firstLocation"] as! String?
            user.secondLocation = dictionary["secondLocation"] as! String?
            user.thirdLocation = dictionary["thirdLocation"] as! String?
            user.guiderMode = dictionary["guiderMode"] as! String?
            self.users =  self.users.filter{(($0.firstLocation?.contains(self.passedLocation!))!)&&$0.guiderMode == "True" || (($0.secondLocation?.contains(self.passedLocation!))!) || (($0.thirdLocation?.contains(self.passedLocation!))!)}
            self.users.append(user)
            print("The count of the users", self.users.count as Any)

            self.tableView.reloadData()
        }

    }, withCancel:nil)
}

现在的问题是，由于某种原因，一个值总是会出现，尽管它不应该被看到，因为它不符合过滤器要求。我尝试通过执行以下操作来修复它

users.removeAll()
tableView.reloadData()

但无论如何它仍然显示

Answer 1

查看 self.users.append(user)。您始终会附加一个新用户而不对其应用过滤器，因此在调用观察回调后，用户始终至少有 1 个元素。