仅显示半径范围内的场地注释

时间:2017-10-03 03:55:44

标签: swift firebase mapkit mkannotation clcircleregion

我试图仅显示离我的用户最近的位置的注释。我已将所有位置保存到firebase中,现在我只是尝试检索它们并仅使用用户周围的位置填充Map和TableView。我尝试过GeoFire和其他一些人,但是,我确定我没有做到这一点。有人可以帮忙吗?

Db setup

  override func viewDidLoad() {
            super.viewDidLoad()

            // Set up Map
            mapView.delegate = self
            mapView.userTrackingMode = MKUserTrackingMode.follow

            // Setup TableView
            tableView.delegate = self
            tableView.dataSource = self

            //Pulls TableData for UITableView
            DataService.ds.REF_VENUE.observe(.value, with: { (snapshot) in

                self.posts = [] // THIS IS THE NEW LINE

                if let snapshot = snapshot.children.allObjects as? [DataSnapshot] {
                    for snap in snapshot {
                        if let postDict = snap.value as? Dictionary<String, AnyObject> {
                            let key = snap.key
                            let post = Post(postKey: key, postData: postDict)
                            self.posts.append(post)
                        }

                        //Populates Map with annotations.
                    if let locationDict = snap.value as? Dictionary<String, AnyObject> {

                        let lat = locationDict["LATITUDE"] as! CLLocationDegrees
                        let long = locationDict["LONGITUDE"] as! CLLocationDegrees
                        let title = locationDict["NAME"] as! String
                        let center = CLLocationCoordinate2D(latitude: lat, longitude: long)
                        _ = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.20, longitudeDelta: 0.20))

                        let annotation = MKPointAnnotation()
                        annotation.coordinate = CLLocationCoordinate2DMake(lat, long)
                        annotation.title = title.capitalized
                        self.mapView.addAnnotation(annotation)


                        }
                    }
                }
                self.tableView.reloadData()
            })
        }

以下是我设置表格的方法:

func tableView(_ tableView:UITableView,numberOfRowsInSection section:Int) - &gt; Int {         return posts.count     }

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    if let cell = tableView.dequeueReusableCell(withIdentifier: "detailCell", for: indexPath) as? PostCell {
    let cellData = posts[indexPath.row]

    cell.configureCell(post: cellData)
        return cell
    } else {
        return PostCell()
    }
}



func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let post = posts[indexPath.row]
    performSegue(withIdentifier: "previewSegue", sender: post)
}

1 个答案:

答案 0 :(得分:1)

因为我的位置与您的位置不同。我在设备上进行了测试,结果就像距离我的位置一样,你的场地位置大约是3K。所以你可以使用该代码文件并在你的设备中检查它将有所帮助。

1)我已经将你的didload函数替换为另一个func,并在地图的DidUpdateLocation中调用它

2)使用// iosGeek作为注释代码,我将代码插入到文件中。

3)现在由于位置差异,我没有在地图或表格中填充数据

Link: https://drive.google.com/open?id=0Bz8kF1Gedr7fNThTbTFZY1Q3LVk

在FeedVc中查看此功能

1)请在设备上测试以获得位置差异

2)在控制台中打印位置以检查其是否成立

3)在If else条件下打印self.postdata以检查输出内容

    if snapshot.exists(){
        if let snapshot = snapshot.children.allObjects as? [DataSnapshot] {
            for snap in snapshot {

                //Here I just used your snapshot to filter data
                self.postData = snap.value as! [String : AnyObject]
                //calculating distance here with custom function made
                let distance = self.calculateDistancxe(userlat: self.userLatt, userLon: self.userLonn, venueLat: self.postData["LATITUDE"]! as! CLLocationDegrees, venueLon: self.postData["LATITUDE"]! as! CLLocationDegrees)
                //if Distance is less Than or equal to 2 km 
                let aa : Int = Int(distance)!
                if (aa <= 2){

                     //if yes , add *self.postData* in a new Dictionary or Array

                    print("*********\(self.postData)")
                    //time to use that postdata in a dict or array from which you will populate data in TableView
                }
                else{
                    //if condition don't satisfy
                    print("noting \(distance)")
                }

            }
        }
    }

评论是否仍有问题