用户周围的位置解析

问题描述

我正在开发一个应用程序，我想问一个问题请

Hi i developp an application and I would want to ask a question plz

在我的数据云解析中，我有餐厅"类，我有三列:名称"类型字符串；imageFile"类型文件；description"类型数组和Location"类型GeoPoint.

In my data cloud Parse , i have class " restaurants " i have three columns : " name " type string ; "imageFile" type file ; "description " type array and "Location" type GeoPoint.

我想知道使用哪种方法来取回用户的当前 GeoPoint?然后我想知道如何比较用户的 GeoPoint 和餐厅的 GeoPoint 最终在 TableView 餐厅中发布(显示)离用户最近的公里.

I would want to know which method to use to get back current GeoPoint of the user?Then I would want to know how to compare GeoPoint of users and those of the restaurants to post(show) finally in TableView restaurants the closest to the user in kilometers.

推荐答案

要获取用户的位置，您可以使用以下函数:PFGeoPoint.geoPointForCurrentLocationInBackground 然后您将创建一个使用当前位置的查询location 以查找靠近用户位置的点.

To get the user's position, you can use the following function: PFGeoPoint.geoPointForCurrentLocationInBackground you would then create a query that uses the current location to find points that are near the user's location.

Swift 中的代码示例:

Code Example in Swift:

//Get the user's current location
PFGeoPoint.geoPointForCurrentLocationInBackground {
    (point:PFGeoPoint!, error:NSError!) -> Void in
    if error == nil {
        //Point contains the user's current point

        //Get a max of 100 of the restaurants that are within 5km,
        //ordered from nearest to furthest
        var query = PFQuery(className: "restaurants")
        query.limit = 100
        query.whereKey("location", nearGeoPoint: point, withinKilometers: 5.0)
        query.findObjectsInBackgroundWithBlock{
            (objects: [AnyObject]!, error: NSError!) -> Void in
            if (error == nil) {
                //objects contains the restaurants
            }
        }
    }
}

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