(Swift 3) How to add multiple pins to a MapView - swift

Question

I am writing a simple app that allows you to search for a location and drop a pin there. However I can't figure out how to get this pin to stay when I try and add another one. Here's my code:
class MyMapViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate, UISearchBarDelegate{
var isMapToBeUpdated = true
var numOfTrackedLocations = 0
let locationManager = CLLocationManager.self
let annotation = MKPointAnnotation()
var annotationTitle = ""
let appDelegate = UIApplication.shared.delegate as! AppDelegate
var longArr: [Double] = []
var latArr: [Double] = []
var cityArr: [String] = [""]
var count: Int = 0
//sets variables and links this file to the app delegate//
#IBOutlet weak var myMapView: MKMapView!
#IBAction func seachButton (_sender: Any){
let searchController = (UISearchController(searchResultsController: nil))
searchController.searchBar.delegate = self
present(searchController, animated: true, completion: nil)
}
//links the search button to the search method//
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
UIApplication.shared.beginIgnoringInteractionEvents()
let activityIndicator = UIActivityIndicatorView()
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.startAnimating()
//the above adds a search bar function, and sets the loading animation//
self.view.addSubview(activityIndicator)
searchBar.resignFirstResponder()
dismiss(animated: true, completion: nil)
let searchRequest = MKLocalSearchRequest()
searchRequest.naturalLanguageQuery = searchBar.text
let activeSearch = MKLocalSearch(request: searchRequest)
activeSearch.start { (response, error) in
//starts a search session//
activityIndicator.stopAnimating()
UIApplication.shared.endIgnoringInteractionEvents()
if response == nil
{
print ("ERROR")
}
else
{
var annotation = self.myMapView.annotations
let latitude = response?.boundingRegion.center.latitude
let longitude = response?.boundingRegion.center.longitude
self.annotation.title = searchBar.text
self.annotation.coordinate = CLLocationCoordinate2DMake(latitude!, longitude!)
self.myMapView.addAnnotation(self.annotation)
let coordinate: CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude!, longitude!)
let span = MKCoordinateSpanMake(0.1, 0.1)
let region = MKCoordinateRegionMake(coordinate, span)
self.myMapView.setRegion(region, animated: true)
This is only a small portion, if you want to see anymore I can post it but it doesn't relate to the annotations. If anyone can help me with this it'd be much appreciated.

Answer 1

Map view has function to show multiple pins.
map.showAnnotations([arrAnnotation], animated: true)
where arrAnotation is arr of MKAnnotation.