swift - GeoFire 查询完成 - Swift

Question

在我的应用程序中，我使用 GeoFire 来查询用户周围的用户位置。这是一个类似 Tinder 的应用程序，带有卡片等...我使用 KolodaView 来制作卡片。

查询函数:

func queryUsers(searchRadius: Int, center: CLLocation) {

    print("Query started")

    let geofireRef = Database.database().reference().child("usersLocations")
    let geoFire = GeoFire(firebaseRef: geofireRef)

    let circleQuery = geoFire?.query(at: center, withRadius: Double(searchRadius))

    _ = circleQuery?.observe(.keyEntered, with: { (result, location) in

        print("User \(result!) found")
        print("Adding user \(result!)")

        addUser(userID: result!, completionHandler: { (success) in

            print("User added")

        })

    })

}

添加用户功能:

func addUser(userID: String, completionHandler:@escaping (Bool) -> ()) {

    let foundUsers = UserDefaults.standard.array(forKey: "foundUsers")

    let databaseRef = Database.database().reference()

    databaseRef.observeSingleEvent(of: .value, with: { (snapshot) in

        if (foundUsers?.count)! < 20 {

            // USERS

            let users = (snapshot.value as? NSDictionary)?["users"] as! NSDictionary

            // USER

            let user = users[userID] as! NSDictionary

            getFirstUserPicture(userID: userID, completionHandler: { (data) in

                if let data = data {

                    DispatchQueue.main.async {

                        user.setValue(data, forKey: "picture")

                        // APPEND FOUND USERS ARRAY

                        var foundUsers = UserDefaults.standard.array(forKey: "foundUsers")

                        foundUsers?.append(user)

                        // STORE FOUND USERS ARRAY

                        UserDefaults.standard.set(foundUsers, forKey: "foundUsers")
                        UserDefaults.standard.synchronize()

                        // UPDATE CARD VIEW

                        if foundUsers?.count == 1 {

                            NotificationCenter.default.post(name: .loadCardView, object: nil)

                        } else {

                            NotificationCenter.default.post(name: .loadCardsInArray, object: nil)

                        }

                        // COMPLETION

                        completionHandler(true)

                    }

                }

            })

        }

    }) { (error) in

        print(error.localizedDescription)

    }

}

当我启动应用程序时，queryUsers 函数被调用，查询开始

输出

User 1XXXXXXXXXXXXXXXX found
Adding user 1XXXXXXXXXXXXXXXX
User 2XXXXXXXXXXXXXXXX found
Adding user 2XXXXXXXXXXXXXXXX
User added
User added

1. 找到用户
2. 添加用户(调用addUser函数)

问题是它没有等待 addUser 完成为找到的第二个用户调用 addUser。结果是在我的KolodaView中，有第二个用户找到了两次因为我认为为找到的第二个用户调用 addUser 使用了第一个用户找到的参数。

是否可以等待第一个 addUser 完成并重新开始查询？或者只是在找到第一个用户后“暂停”查询，并在第一个 addUser 调用完成后再次启动查询？

谢谢你的帮助

更新1

我尝试了@Rlee128 解决方案但没有任何改变，我有相同的输出:( :

// MARK: UPDATE USER LOCATION - FUNCTION

func updateUserLocation() {

    let databaseRef = Database.database().reference().child("usersLocations")
    let geoFire = GeoFire(firebaseRef: databaseRef)

    let userID = UserDefaults.standard.string(forKey: "userID")!

    let locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.startUpdatingLocation()

    geoFire?.setLocation(locationManager.location, forKey: userID, withCompletionBlock: { (error) in

        if error != nil {

            print(error as Any)

        } else {

            // Location updated

        }

    })

}


// MARK: LOCATION MANAGER DELEGATE - FUNCTION

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    manager.stopUpdatingLocation()
    manager.delegate = nil

}

Answer 1

在调用 manager.stopUpdatingLocation() 之后，location manger didUpdateLocations 将 manager.delegate 设置为 = nil。如果您想让我向您展示它在我的代码中的外观，请告诉我。

func findLocation() {
    locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest

    locationManager.requestAlwaysAuthorization()

    if CLLocationManager.locationServicesEnabled() {
        locationManager.startUpdatingLocation()
    }
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let userLocation = locations[0] as CLLocation
    manager.stopUpdatingLocation()
    manager.delegate = nil
    let loc = CLLocation(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)
    getLocation(location: loc)

}