GeoFire Swift 3 - 保存和更新坐标

Question

我正在尝试使用GeoFire将坐标存储到Firebase数据库中.

我不确定如何更新新坐标,因为它们将每秒更改/更新.通过它childByAutoId,它为每个Bike生成一个新的唯一ID.

如何参考这个独特的自行车ID？例如,用户将被调用FIRAuth.auth()?.currentUser?.uid.这可能吗？

 let geofireRef = FIRDatabase.database().reference().child("Bike").childByAutoId()
 let geoFire = GeoFire(firebaseRef: geofireRef)

 var data = geoFire?.setLocation(CLLocation(latitude: userIncrementLat, longitude: userIncrementLong), forKey: "BikeId")

我的Firebase数据库结构看起来像......

 Root
 1. Bike
 2.  UniqueUID Number (Firebase)
 3.   BikeId
 4.    g
       l
 5.     0:
        1:

Answer 1

这是我的Firebase数据库结构,用于逐步更新用户并检索附近的用户以在地图上显示:

db-root
"users" : {
    <userUID> : {
        "someKey" : "someValue",
        ...
    }
}
"users_location" : {
    <userUID> : {
        <geofireData> ...
    }
}

要使用的变量:

let ref = FIRDatabase.database().reference()
let geoFire = GeoFire(firebaseRef: ref.child("users_location"))

要更新记录的用户位置:

func updateUserLocation() {

    if let myLocation = myLocation {

        let userID = FIRAuth.auth()!.currentUser!.uid
        geoFire!.setLocation(myLocation, forKey: userID) { (error) in
            if (error != nil) {
                debugPrint("An error occured: \(error)")
            } else {
                print("Saved location successfully!")
            }
        }

    }
}

要查找附近的用户,我使用该findNearbyUsers功能.找到附近的用户并将用户nearbyUsers的UID密钥保存到数组中很有用.该observeReady函数在查询完成后执行,并使用UID检索用户详细信息(我使用此信息在地图上显示用户详细信息).

func findNearbyUsers() {

    if let myLocation = myLocation {

        let theGeoFire = GeoFire(firebaseRef: ref.child("users_location"))
        let circleQuery = theGeoFire!.query(at: myLocation, withRadius: radiusInMeters/1000)

        _ = circleQuery!.observe(.keyEntered, with: { (key, location) in

            if !self.nearbyUsers.contains(key!) && key! != FIRAuth.auth()!.currentUser!.uid {
                self.nearbyUsers.append(key!)
            }

        })

        //Execute this code once GeoFire completes the query!
        circleQuery?.observeReady({

            for user in self.nearbyUsers {

                self.ref.child("users/\(user)").observe(.value, with: { snapshot in
                    let value = snapshot.value as? NSDictionary
                    print(value)
                })
            }

        })

    }

}

希望能帮助到你