swift – 根据位置半径过滤Firebase数据库

概述我有以下Firebase数据库结构, "-KSupX7CppMD1zbqIy0y" : { "addedByUser" : "zQpb7o18VzYsSoTQtT9DNhOqTUn2", "content" : "Post 1", "cost" : "20", "duration" : "Weekly", "latitude" : "40.7594479995956", " 我有以下Firebase数据库结构,

"-KSupX7CppMD1zbqIy0y" : {  "addedByUser" : "zQpb7o18VzYsSoTQtT9DNhOqTUn2","content" : "Post 1","cost" : "20","duration" : "Weekly","latitude" : "40.7594479995956","longitude" : "-73.9838934062393","timestamp" : "Fri 30 Sep"},"-KSuphuqO6a0lnrJYUkt" : {  "addedByUser" : "zQpb7o18VzYsSoTQtT9DNhOqTUn2","content" : "Post 2","cost" : "10","duration" : "Daily","latitude" : "40.7594329996462","longitude" : "-73.9846261181847","timestamp" : "Fri 30 Sep"}

我需要在一定的距离参数(小于50米,100米,150米和200米)内过滤帖子.我可以从“经度”和“经度”获得坐标. “纬度”,但我正在努力过滤帖子.任何帮助将不胜感激.

提前谢谢了.新手到Firebase&迅速.

解决方法 以下是您可以尝试的解决方案.这假设您已将所有帖子从Firebase下载到应用程序并存储在数组中.你也可以考虑使用我没有亲自使用的GeoFire(但我想).我相信它允许您按位置查询Firebase,因此您不必首先将所有帖子下载到用户的设备并在客户端进行过滤.

// assumes you have set up the app to get the user's current locationvar currentLocation: CLLocation?// Your array of posts downloaded from Firebasevar postArray = [post]()let metersInTwentyFiveMiles = 40233.6// You Could put this in vIEwDIDAppear after you load the post array from Firebasefor post in postArray {    var distanceInMeters: CLLocationdistance = 0    let postLocation = CLLocation(latitude: post.latitude,longitude: post.longitude)    if let currentLocation = self.currentLocation {         // Set distanceInMeters to the distance between the user's current location and the location of the post.         distanceInMeters = currentLocation.distanceFromLocation(postLocation)         // If this distance is not within 25 miles,remove this post from the array         if self.metersInTwentyFiveMiles < distanceInMeters {            self.posts = self.posts.filter{  != post }       }    }}

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