Question

我是新手，正在尝试使用Swift制作约会应用程序。提取新用户时，我将查询限制为十个用户，但是每次我的查询分页时，总会拉取相同的十个用户。

我正在尝试在最后一个拉出用户之后启动查询，但是它不起作用...代码如下：

fileprivate func fetchUsersFromFirestore() {


    let minAge = user?.min ?? FILTxR.defaultMin
    let maxAge = user?.max ?? FILTxR.defaultMax
    let manQ = user?.isMan ?? FILTxR.defaultIsMan
    let womanQ = user?.isWoman ?? FILTxR.defaultIsWoman

    print("last fetcehed user XXXXXXXXX \(self.lastFetchedUser?.uid ?? "")")


    let query = Firestore.firestore().collection("users").whereField("isAge", isGreaterThanOrEqualTo: minAge).whereField("isAge", isLessThanOrEqualTo: maxAge).whereField("isMan", isEqualTo: manQ).whereField("isWoman", isEqualTo: womanQ).order(by: "isAge", descending: true).order(by: "uid", descending: true).start(after: [lastFetchedUser?.uid ?? ""]).limit(to: 10)


    self.topCardView = nil

    query.getDocuments { (snapshot, err) in
        self.hud.dismiss()
        if let err = err {
        print("Failed to fetch users:", err)
        return
        }

        var previousCardView: CardView?

        snapshot?.documents.forEach({ (documentSnapshot) in

            let userDictionary = documentSnapshot.data()
            let user = User(dictionary: userDictionary)
            self.users[user.uid ?? ""] = user
            self.lastFetchedUser = user

            print(userDictionary)
            print("last fetcehed user is \(self.lastFetchedUser?.uid ?? "")")

            let isNotCurrentUser = user.uid != Auth.auth().currentUser?.uid
            let hasNotSwipedBefore = self.swipes[user.uid!] == nil

            if isNotCurrentUser && hasNotSwipedBefore {

                let cardView = self.setupCardFromUser(user: user)
                previousCardView?.nextCardView = cardView
                previousCardView = cardView

                if self.topCardView == nil {
                self.topCardView = cardView
                }


                }

        })
    }
}

var lastFetchedUser: User?

代码可以正常工作，提取数据并进行构建，但是当我分页时，它只会提取相同的数据。

我正在打印lastFetchedUser并使用UID进行显示，但是由于某种原因，当我尝试在之后开始时，它没有传递到下一个查询中？

Swift Firestore查询呼叫问题，“开始于”

0 个答案: