从Parse查询GeoPoint并将其作为MKAnnotation添加到MapKit? [英] Query a GeoPoint from Parse and add it to MapKit as MKAnnotation?

问题描述

我正在尝试查询存储在Parse后端的PFGeoPoints数组.我在Parse中有一个名为"Post"的PFObject，并为其分配了诸如位置"，标题"，消息"等数据.

I am trying to query an array of PFGeoPoints stored on the Parse backend. I have a PFObject in Parse called "Post", with data assigned to it such as "location", "title", "message", etc.

所有内容都将从我的应用程序发布时发送到Parse，并已正确存储在后端中.我在从Parse检索"Post" PFObject的属性并将其存储到地图上的MKAnnotation中时遇到问题.

everything is being sent to Parse upon posting from my app and is properly stored in the backend. I am having issues retrieving properties of the "Post" PFObject from Parse and storing them into an MKAnnotation on the map.

这是我的MapViewViewController:

Here is my MapViewViewController:

import UIKit
import Parse
import CoreLocation
import MapKit

class MapViewViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

@IBOutlet var mapView: MKMapView!

var MapViewLocationManager:CLLocationManager! = CLLocationManager()
var currentLoc: PFGeoPoint! = PFGeoPoint()

var postTitle: String!
var postBody: String!


override func viewDidLoad() {
    super.viewDidLoad()
    mapView.showsUserLocation = true
    mapView.delegate = self
    MapViewLocationManager.delegate = self
    MapViewLocationManager.startUpdatingLocation()
    mapView.setUserTrackingMode(MKUserTrackingMode.Follow, animated: true)
}

override func viewDidAppear(animated: Bool) {
    var annotationQuery = PFQuery(className: "Post")
    currentLoc = PFGeoPoint(location: MapViewLocationManager.location)
    annotationQuery.whereKey("Location", nearGeoPoint: currentLoc, withinMiles: 10)
    annotationQuery.findObjectsInBackgroundWithBlock {
        (points, error) -> Void in
        if error == nil {
            // The find succeeded.
            println("Successful query for annotations")
            // Do something with the found objects
            //THIS IS WHERE I GET LOST WITH THE PARSE QUERY/ADDING ANNOTATION TO MAP


            //THE FOLLOWING CODE PRINTS THE CORRECT POSTCOUNT STORED IN PARSE
            println("total posts: \(points?.count)")

        } else {
            // Log details of the failure
            println("Error: \(error)")
        }
    }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func logoutButton(sender: UIBarButtonItem) {
    PFUser.logOut()
    dismissViewControllerAnimated(true, completion: nil)
}

@IBAction func newPostButton(sender: AnyObject) {
    performSegueWithIdentifier("mainToNewPost", sender: self)
}

我想查询和检索由用户输入的所有信息(PFGeoPoint，标题，正文)并将其转换为地图上的mkannotation.

I would like to query and retrieve the Post with all of its info entered by the user (PFGeoPoint, title, body) and turn it into an mkannotation on the map.

以下是我的解析后端的照片，可以使您有了更好的主意:

Here is a photo of my Parse backend to give you a better idea:

http://i1249.photobucket.com/albums/hh512/zachkhan3/Screen%20Shot%202015-04-22%20at%2012.39.42%20PM.png

推荐答案

从您提供的屏幕快照中，我假设您正在查询Post对象，该对象是PFObject.因此，您可以从返回的posts数组中访问每个post对象.然后，您可以使用每个post对象中的Location属性，并将注释添加到mapView.

From the screenshot you provided, I assume you are querying the Post object which is a PFObject. So you can access each post object in from the returned posts array. Then you can use the Location property from each post object, and add annotation to your mapView.

annotationQuery.findObjectsInBackgroundWithBlock {
        (posts, error) -> Void in
        if error == nil {
            // The find succeeded.
            println("Successful query for annotations")
            let myPosts = posts as [PFObject]

            for post in myPosts {
                let point = post["Location"] as PFGeoPoint
                let annotation = MKPointAnnotation()
                annotation.coordinate = CLLocationCoordinate2DMake(point.latitude, point.longitude)
                self.mapView.addAnnotation(annotation)
            }
        } else {
            // Log details of the failure
            println("Error: \(error)")
        }
    }

这篇关于从Parse查询GeoPoint并将其作为MKAnnotation添加到MapKit?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！