GeoFire 查询用户位置

Question

我对使用 Firebase 及其位置库 GeoFire 还很陌生。目前我在构建数据时遇到了一些问题。

目前我的数据库是这样的：

users
  facebook:xxxxx
    displayName: xx
    firstName: xx
    lastName: xx
    location:
      g: xxxx
      l:
        0: xxx
        1: xxx
  facebook:yyyyy
    displayName: yy
    firstName: yy
    lastName: yy
    location:
      g: yyyy
      l:
        0: yyy
        1: yyy

我想查询我当前登录用户附近的用户。为此我无法理解必须指定的路径。

目前我正在这样做（但这不起作用）：

正在保存当前位置

let root = Firebase(url: "myapp.firebaseio.com")
let usersRoot = root.childByAppendingPath("users")
geoFire = GeoFire(firebaseRef: usersRoot.childByAppendingPath(root.authData.uid))

geoFire.setLocation(currentLocation, forKey: "location") { (error) in
   if (error != nil) {
      print("An error occured: \(error)")
   } else {
      print("Saved location successfully!")
   }
}

正在检索附近的其他用户

let geoFire = GeoFire(firebaseRef: Firebase(url: "myapp.firebaseio.com").childByAppendingPath("users"))
let query = geoFire.queryAtLocation(currentLocation, withRadius: radius)

query.observeEventType(GFEventTypeKeyEntered, withBlock: {
   (key: String!, location: CLLocation!) in

   print("+ + + + Key '\(key)' entered the search area and is at location '\(location)'")
   self.userCount++
   self.refreshUI()
})

更新

正在保存当前位置

let root = Firebase(url: "myapp.firebaseio.com")
geoFire = GeoFire(firebaseRef: root.childByAppendingPath("locations"))

geoFire.setLocation(currentLocation, forKey: root.authData.uid) { (error) in
   if (error != nil) {
      print("An error occured: \(error)")
   } else {
      print("Saved location successfully!")
   }
}

正在检索附近的其他用户

let geoFire = GeoFire(firebaseRef: Firebase(url: "myapp.firebaseio.com").childByAppendingPath("locations"))
let query = geoFire.queryAtLocation(currentLocation, withRadius: radius)

query.observeEventType(GFEventTypeKeyEntered, withBlock: {
   (key: String!, location: CLLocation!) in

   print("+ + + + Key '\(key)' entered the search area and is at location '\(location)'")
   self.userCount++
   self.refreshUI()
})

Answer 1

对于 GeoFire，您必须在树中保留一个仅包含地理位置的部分，然后在树中有另一个部分包含有关项目的其他信息。

user_locations
  uid1:
    g: xxxx
    l:
      0: xxx
      1: xxx
  uid2:
    g: xxxx
    l:
      0: xxx
      1: xxx
user_profiles:
  uid1:
    name: "giacavicchioli"
  uid2:
    name: "Frank van Puffelen"

另见：Query firebase data linked to GeoFire

Answer 2

要保存与查询匹配的所有记录，您必须使用以下内容存储所有记录：

    var allKeys = [String:CLLocation]()

    circleQuery.observeEventType(GFEventTypeKeyEntered, withBlock: {
        (key: String!, location: CLLocation!) in

        allKeys [key]=location
      }

然后使用

    circleQuery.observeReadyWithBlock({
        print("All initial data has been loaded and events have been fired!")
    })

Answer 3

似乎在设置 GFEventType 时出现问题。这似乎会在下一个版本的 GeoFire 1.3 中得到解决，现在你可以这样做...

let geoFire = GeoFire(firebaseRef: ref)

var allKeys = [String:CLLocation]()

let query = geoFire.queryAtLocation(coordinates, withRadius: 0.2)
print("about to query")
query.observeEventType(GFEventType.init(0), withBlock: {(key: String!, location: CLLocation!) in
    print("Key: \(key), location \(location.coordinate.latitude)")
    allKeys [key] = location
})

如您所见，GFEventType.init(0)... 由于某种原因映射到 Swift 中未正确映射到 GeoFire 的三种类型的枚举。

GeoFire 查询用户位置

GeoFire query on User location

ios

firebase

swift

geofire