ONLY Show annotations for venues within radius

Question

I'm trying to only show the annotations for locations nearest to my user. I have all the locations already saved to firebase and now I'm just trying to retrieve them and populate the Map and TableView with only the locations around the user. I've tried GeoFire and a few others but, I'm sure I'm not doing this right. Could any one help?

  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()
            })
        }

Here is how I set up my table:

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> 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)
}

are you saving lat and longitude values in your database of different locations ? if yes , you can make your result as using Comparators like get all data at once means all objects and now set a range from user current position and compare that range to dataSnapshot objects latitude and longitude and populate data — iOS Geek, Oct 03 '17 at 04:38
as I see latitude and longitude values are there in Db and your current location , so you just want to populate TableView with the values from DB that have same Latitude and longitude that matched with current user location is it ? — iOS Geek, Oct 03 '17 at 04:43
I want to populate the map and table with location within 1km or 1mile of the user. — Doing Things Occasionally, Oct 03 '17 at 04:44
you can do it by comparing values of dictionary returning with range of 1 km , offline mode and then populate the table and map , let me try to write some reference code — iOS Geek, Oct 03 '17 at 04:50
Hi, Can I please have Your Xcode project so I can try writing code ? if possible , it will be bit easy for me — iOS Geek, Oct 03 '17 at 05:56
Sorry being late I was stucked somewhere in work. I am looking at your code now and I am trying to find a solution, thanks for waiting — iOS Geek, Oct 04 '17 at 04:39
Hi I tried some code in your project and I Tried to compare venue latitude and longitude with the user current lat and longitude values , I have a query is there any venue that is located in Distance about 10 km ? if you want I can share the Vc code file in which I had tried code ? — iOS Geek, Oct 04 '17 at 05:48

iOS Geek · Accepted Answer · 2017-10-05T04:33:04.803

1

As because my location is different from your location. I tested it on device and result was like distance from my location and your venue location was a large about 3K . so you can use that code file and check it in your device it will help.

1) I had replaced your didload Function for now as a different func and calling it in DidUpdateLocation of maps

2) used //iosGeek as a comment above lines of code where I inserted code in file.

3) for now I am not populating data in map or table because of location difference

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

Have a look at this function in your FeedVc

1) Please test it on a Device to get the location difference

2) Print location in console to check if its coming true

3) print self.postdata in If else condition to check what is coming as output

    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)")
                }

            }
        }
    }

Comment if still any issue occurs

edited Oct 05 '17 at 04:33

answered Oct 04 '17 at 06:15

iOS Geek

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I’m going to check now, – Doing Things Occasionally Oct 04 '17 at 12:17
Unfortunately, it didnt work. No coordinates popped up. Give me some test locations to use and I'll put them in. – Doing Things Occasionally Oct 04 '17 at 20:54
I hadn't populated data in your tableView Array used I just wrote some code there which will result output and you had to use it appending in a array and populate that array to TableView , getting my point or I should modify some code for more reference ? – iOS Geek Oct 05 '17 at 04:13
Please more reference. Im not sure of the solution. – Doing Things Occasionally Oct 05 '17 at 04:29
one more thing I am not populating any data for now in the code , if you want I can write that too and share with you. if you still face any issues feel free to comment I will try to help you out in it . Thanks :) – iOS Geek Oct 05 '17 at 04:40
Try this updated File - https://drive.google.com/open?id=0Bz8kF1Gedr7feVV2Y3ZYQVlhNVU – iOS Geek Oct 05 '17 at 05:33
It doesn't seem like I'm getting anything. I've pulled up the code but, only the user annotation comes up. I'll try to tweak it but, I'm not sure that I quite got it yet. – Doing Things Occasionally Oct 08 '17 at 15:39
Okay So can I know what exact output you are getting now ? Getting Annotations and details in Table used ? when distance is in Range ? – iOS Geek Oct 09 '17 at 04:21
Right now, No annotations show up but, the table is populated with all of the locations. – Doing Things Occasionally Oct 09 '17 at 04:27
1

okay I will create a sample project according to my location and let you know the result – iOS Geek Oct 10 '17 at 04:01
If you have some time, we can connect via skype. – Doing Things Occasionally Oct 16 '17 at 16:50
Hey! I got the map to populate! I just can't get the tableView cell to populate. Could you help? – Doing Things Occasionally Oct 23 '17 at 00:49
yes sure , I will help you for sure , So please send me updated code so I can see , sorry I was not available for a long time – iOS Geek Oct 23 '17 at 04:21
Yes please! Ive been at it a couple days now and with this part done, my app is done. – Doing Things Occasionally Oct 23 '17 at 06:55
I marked the changes: https://drive.google.com/open?id=0B_abJdWevk3wMGVUYWpuX09YQXM – Doing Things Occasionally Oct 24 '17 at 15:52

ONLY Show annotations for venues within radius

1 Answers1