如何在 firebase 查询后将值附加到字典？

Question

在下面的代码中，我试图将字符串 uids 附加到字典中，问题是当我这样做时，似乎字典在每次迭代后都会被重置。我该如何解决这个问题？

    func getFollowing() {
    self.ref.child("Following").child(uid)
        .observeSingleEvent(of: .value, with: { (snapshot) in

            if let data = snapshot.value as? [String:[String : Any]] {
                for key in data.keys {
                    var dict = (UIApplication.shared.delegate as! AppDelegate).usersCurrentUserIsFollowing
                    dict[key] = true
                    print(dict, " this is gtteh dict now dhfsakflk")
                }
            }
        })
}

Answer 1

我能够通过执行以下操作来解决我的问题：

    func getFollowing() {
    self.ref.child("Following").child(uid)
        .observeSingleEvent(of: .value, with: { (snapshot) in
            var usersData = ["":true]
            if let data = snapshot.value as? [String:[String : Any]] {
                for key in data.keys {
                    usersData[key] = true
                }
                var dict = (UIApplication.shared.delegate as! AppDelegate).usersCurrentUserIsFollowing
                dict = usersData
            }
        })
}