Question

我很擅长使用Firebase及其位置库GeoFire。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

我想查询当前用户附近的用户登录。为此，我无法理解我必须指定的路径。

目前我正在这样做（但这不起作用）：

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!")
   }
}

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

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!")
   }
}

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，您必须在树中保留仅包含地理位置的段，然后您在树中有另一个包含有关项的其他信息的段。

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

设置GFEventType时似乎存在问题。这将在下一版本的GeoFire 1.3上得到解决，现在你可以做到这一点......

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
})

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

用户位置的GeoFire查询

3 个答案: