SwiftUI async data receive from #escaping closure - swift

Question

I am having trouble with working over data I receive from server.
Each time server sends data it is new coordinates for each user. I am looping over each incoming data, and I want to send the data in completion to receive them on other end. And update model class with them. At the moment I have two users in server. And sometimes the closure passes data two times, but sometimes just one. And interesting thing is that class properties are not updated, at least I dont see them on UI.
This is function I call when data is received. Response is just string I split to get user data.
func updateUserAdrress(response: String, completion: #escaping (Int, Double, Double, String) -> Void){
var data = response.components(separatedBy: "\n")
data.removeLast()
data.forEach { part in
let components = part.components(separatedBy: ",")
let userID = components[0].components(separatedBy: " ")
let id = Int(userID[1])
let latitude = Double(components[1])!
let longitude = Double(components[2])!
let location = CLLocation(latitude: latitude, longitude: longitude)
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(location) { (placemarks, error) in
if error == nil {
let placemark = placemarks?[0]
if let thoroughfare = placemark?.thoroughfare, let subThoroughfare = placemark?.subThoroughfare {
let collectedAddress = thoroughfare + " " + subThoroughfare
DispatchQueue.main.async {
completion(id!, latitude, longitude, collectedAddress)
}
}
} else {
print("Could not get address \(error!.localizedDescription)")
}
}
}
}
In this function I try to invoke the changes on objects. As the incoming data from server is different the first time I have splited the functionality, so the correct block of code would be called.
func collectUsers(_ response: String){
if users.count != 0{
updateUserAdrress(response: response) { id, latitude, longitude, address in
if let index = self.users.firstIndex(where: { $0.id == id }){
let user = self.users[index]
user.latitude = latitude
user.longitude = longitude
user.address = address
}
}
}else{
var userData = response.components(separatedBy: ";")
userData.removeLast()
let users = userData.compactMap { userString -> User? in
let userProperties = userString.components(separatedBy: ",")
var idPart = userProperties[0].components(separatedBy: " ")
if idPart.count == 2{
idPart.removeFirst()
}
guard userProperties.count == 5 else { return nil }
guard let id = Int(idPart[0]),
let latitude = Double(userProperties[3]),
let longitude = Double(userProperties[4]) else { return nil }
let collectedUser = User(id: id, name: userProperties[1], image: userProperties[2], latitude: latitude, longitude: longitude)
return collectedUser
}
DispatchQueue.main.async {
self.users = users
}
}
}
As I also need user address when app starts in model I have made simular function to call in init so it would get address for user. That seems to be working fine. But for more context I will add the model to.
class User: Identifiable {
var id: Int
let name: String
let image: String
var latitude: Double
var longitude: Double
var address: String = ""
init(id: Int, name: String, image: String, latitude: Double, longitude: Double){
self.id = id
self.name = name
self.image = image
self.latitude = latitude
self.longitude = longitude
getAddress(latitude: latitude, longitude: longitude) { address in
self.address = address
}
}
func getAddress(latitude: Double, longitude: Double, completion: #escaping (String) -> Void){
let location = CLLocation(latitude: latitude, longitude: longitude)
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(location) { (placemarks, error) in
if error == nil {
let placemark = placemarks?[0]
if let thoroughfare = placemark?.thoroughfare, let subThoroughfare = placemark?.subThoroughfare {
let collectedAddress = thoroughfare + " " + subThoroughfare
completion(collectedAddress)
}
} else {
print("Could not get address \(error!.localizedDescription)")
}
}
}
}
And one interesting thing. That when closure receives two times data and I assign them to class, there are no changes on UI.
I made this project on Xcode 13.4.1 because on Xcode 14 there is a bug on MapAnnotations throwing purple warnings on view changes.