GeoFire Swift 3 - 保存和更新坐标 [英] GeoFire Swift 3 - Saving and Updating Coordinates

问题描述

我正在尝试使用GeoFire将坐标存储到Firebase数据库中。

I'm trying to store coordinates into Firebase Database using GeoFire.

我不确定如何更新新坐标，因为它们每秒都会更改/更新。使用 childByAutoId ，它会为每个Bike生成一个新的唯一ID。

I'm unsure how to update the new coordinates as they will be changed/updated every second. With the childByAutoId, it is generating a new unique ID for each Bike.

如何引用这个独特的Bike ID？例如，用户将被 FIRAuth.auth（）？currentUser？.uid 调用。这可能吗？

How do I reference this unique Bike ID? For instance, the user would be called by FIRAuth.auth()?.currentUser?.uid. Is this possible?

 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......

My Firebase Database Structure will look like...

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

推荐答案

这是我的Firebase数据库结构，用于更新用户的位置，并在附近的用户身上显示以在地图上显示：

This is my Firebase DB structure for update users location by time and retrive the nearby users to show on map:

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

使用的Vars：

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

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 findNearbyUsers 函数。找到附近的用户并将 nearbyUsers 数组保存到用户的UID密钥中非常有用。 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）。

To find nearby user I use the findNearbyUsers function. It' useful to find the nearby users and save into nearbyUsers array the UID key of the the users. The observeReady function is executed after the query completion and uses the UID to retrieve the users details (I use this to show users details on map).

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)
                })
            }

        })

    }

}

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