Set a global variable from within GeoCoder function Swift - swift

Question

I have a global variable "filterError" that is initially set to false before a switch statement. When the switch statement occurs, it will go through a dictionary, and for each key it will do a unique logic check on the value. If that value does not match certain criteria then the Boolean variable filterError will be set to true.
When the switch statement is complete, if filterErrror is false then the an action will occur like so:
//...switch statement...
if (filterErrror == false) {
//do something.....
}
The issue I am having is with the geocoder function which is a case in the switch statement. If the switch variable key = "area" then the below is executed:
var geocoder = CLGeocoder()
geocoder.geocodeAddressString(address) { (placemarks, error) in
guard let placemarks = placemarks,let location = placemarks.first?.location
else { print("Error in finding location") return }
let distanceInMeters = location.distance(from: coordinateSelf)
print("The distance between property and user in miles is: \(distanceInMeters/1609)")
distanceInMiles = distanceInMeters/1609
var radius = Double()
if searchRadius == "this area only" {
radius = 0.49999999999
} else {
radius = Double(Int(searchRadius)!)
}
if (radius < distanceInMiles) {
filterError = true
}
}
However, the filterError is still false after the switch statement has completed because the boolean value is not being changed. How do you set filterError to true from inside the geocoder?
This is the full code:
for filter in self.activeFilters {
switch filter.key {
case "listingType":
if(filter.value[0] != propertiesFirestore[i]["listingType"]![0]){
filterError = true
}
case "minBedsBound":
if(filter.value[0] != "No min. beds") {
if(filter.value[0].filter("01234567890.".contains) > propertiesFirestore[i]["bedroomCount"]![0]) {
filterError = true
}
}
case "maxBedsBound":
if(filter.value[0] != "No max. beds") {
if(Int(filter.value[0].filter("01234567890.".contains))! < Int(propertiesFirestore[i]["bedroomCount"]![0])!) {
filterError = true
}
}
case "minPriceBound":
if(filter.value[0] != "No min. price") {
if(Int(filter.value[0].filter("01234567890.".contains))! > Int(propertiesFirestore[i]["price"]![0])!) {
filterError = true
}
}
case "maxPriceBound":
if(filter.value[0] != "No max. price") {
if(Int(filter.value[0].filter("01234567890.".contains))! < Int(propertiesFirestore[i]["price"]![0])!) {
filterError = true
}
}
case "includeSharedOwnership":
if(filter.value[0] != propertiesFirestore[i]["sharedOwnership"]![0]) {
filterError = true
}
case "includeRetirementHomes":
if(filter.value[0] != propertiesFirestore[i]["retirementHome"]![0]) {
filterError = true
}
case "area":
print(userlatitude)
print(userlongitude)
let address = "\(propertiesFirestore[i]["area"]![0]), \(propertiesFirestore[i]["postcodePrefix"]![0])"
var propLat = String()
var propLong = String()
var distanceInMiles = Double()
var searchRadius = self.activeFilters["searchRadius"]![0]
let coordinateSelf = CLLocation(latitude: Double(userlatitude) as! CLLocationDegrees, longitude: Double(userlongitude) as! CLLocationDegrees)
var geocoder = CLGeocoder()
geocoder.geocodeAddressString(address) { (placemarks, error) in
guard
let placemarks = placemarks,
let location = placemarks.first?.location
else {
print("Error in finding location")
return
}
let distanceInMeters = location.distance(from: coordinateSelf)
print("The distance between property and user in miles is: \(distanceInMeters/1609)")
distanceInMiles = distanceInMeters/1609
var radius = Double()
if searchRadius == "this area only" {
radius = 0.49999999999
} else {
radius = Double(Int(searchRadius)!)
}
if (radius < distanceInMiles) {
filterError = true
}
}
case "keywords":
print("Filter keywords are: \(filter.value)")
for j in 0..<propertiesFirestore[i]["keywords"]!.count {
propertiesFirestore[i]["keywords"]![j] = propertiesFirestore[i]["keywords"]![j].lowercased()
}
for keyword in filter.value {
if propertiesFirestore[i]["keywords"] == nil {
filterError = true
} else if ((propertiesFirestore[i]["keywords"]!.contains(keyword.lowercased()))) {
print("found keyword")
} else {
filterError = true
}
}
default:
print("Unknown filter: \(filter.key)")
}
}
if filterError == false {
filterProperties.append(propertiesFirestore[i])
} else {
print("FITLER CATCHOUT")
}