Sort By Distance In TableView - ios

Question

I'm trying to sort the results of my tableView by distance closest to the user. I've separated my distance and function to populate distance to get a better hold of my data manipulation. I feel like it should be simple but, I know I'm missing it.
The distance function is this:
func calculateDistance(userlat: CLLocationDegrees, userLon:CLLocationDegrees, venueLat:CLLocationDegrees, venueLon:CLLocationDegrees) -> Double {
let userLocation:CLLocation = CLLocation(latitude: userlat, longitude: userLon)
let priceLocation:CLLocation = CLLocation(latitude: venueLat, longitude: venueLon)
//let distance = String(format: "%.0f", userLocation.distance(from: priceLocation)/1000)
return userLocation.distance(from: priceLocation)/1000
}
PopulateData function:
func populateData() {
//Pulls TableData for UITableView
DataService.ds.REF_VENUE.observe(.value, with: { (snapshot) in
self.posts = [] // THIS IS THE NEW LINE
if snapshot.exists(){
if let snapshot = snapshot.children.allObjects as? [DataSnapshot] {
for snap in snapshot {
if let snapValue = snap.value as? [String:AnyObject],
let venueLat = snapValue["LATITUDE"] as? Double,
let venueLong = snapValue["LONGITUDE"] as? Double
{
let distance = self.calculateDistance(userlat: self.userLatt, userLon: self.userLonn, venueLat: venueLat, venueLon: venueLong)
if distance <= 2 {
let key = snap.key
let post = Post(postKey: key, postData: snapValue)
self.posts.append(post)
self.posts.sort(by: (posts, distance)) //Where I'm trying to sort
}
}
}
self.getDataForMapAnnotation()
}
self.tableView.reloadData()
}
})
}
I'm not sure if I can even sort an array of dictionaries but, the end goal is to have the tableView show the venues closest to the user. If you have any suggestions, please let me know!

Answer 1

If you added the distance you calculate as a property of your Post class/struct, sorting the posts array by distance would be pretty straightforward. Using the Swift shorthand syntax for closures, your sort function could look something like this:
self.posts.sort {
return $0.distance < $1.distance
}
This would sort the posts array by distance in ascending order.