Swift using a variable in another function - swift

Question

How can I call testArray from locationManager() in callTestArray() ?
I tried outputting it but that doesn’t seem to work. I also tried to declare at the top of my class but then it’s always nil.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let userLocation:CLLocation = locations[0] as CLLocation
let rootRef = Database.database().reference()
let geoRef = GeoFire(firebaseRef: rootRef.child(“X”))
let query = geoRef.query(at: userLocation, withRadius: 1000)
query.observe(.keyEntered, with: { key, location in
self.testArray.insert(key, at: self.testArray.count)
})
}
func callTestArray() {
var testOuput = testArray[0]
}

Answer 1

Try this approach:
func locationManager(_ manager: String, didUpdateLocations locations: String, completion: #escaping () -> Void) {
let userLocation:CLLocation = locations[0] as CLLocation
let rootRef = Database.database().reference()
let geoRef = GeoFire(firebaseRef: rootRef.child(“X”))
let query = geoRef.query(at: userLocation, withRadius: 1000)
query.observe(.keyEntered, with: { key, location in
self.testArray.append(key)
completion()
})
}
Usage:
locationManager(XXXXXX, didUpdateLocations: YYYYYY) {
callTestArray()
}