问如何让用户靠近我在geofire、Firebase中的位置

EN

var geoFireRef: DatabaseReference?
    var geoFire: GeoFire?
    var myQuery: GFQuery?


func Geofire() {

        geoFireRef = Database.database().reference().child("Geolocs")
    geoFire = GeoFire(firebaseRef: geoFireRef!)
        self.geoFire?.setLocation(currentLocation!, forKey:Auth.auth().currentUser!.uid)

    myQuery = geoFire?.query(at: currentLocation!, withRadius: 100)

    myQuery?.observe(.keyEntered, with: { (key, location) in


        if key != Auth.auth().currentUser?.uid
        {
            let ref = Database.database().reference().child("Users").child(key)

            ref.observeSingleEvent(of: .value, with: { (snapshot) in
                let id = snapshot.key
            })

        }

    })

}