Search Annotations in mapView - ios

Question

In my project i have a mapView with a lot of annotations & i would like to add a search functionality to the map so i can search those annotations and quickly find the annotation i want.
I followed a tutorial i found on the web but it searches globally (MKLocalSearch) and not the annotations.
I tried looking for a tutorial \ Help for my problem but i couldn't get any help for a long time now.
I've made these annotations :
let LitzmanLocation = CLLocationCoordinate2DMake(32.100668,34.775192)
// Drop a pin
let Litzman = MKPointAnnotation()
Litzman.coordinate = LitzmanLocation
Litzman.title = "Litzman Bar"
Litzman.subtitle = "נמל תל אביב 18,תל אביב"
mapView.addAnnotation(Litzman)
let ShalvataLocation = CLLocationCoordinate2DMake(32.101145,34.775163)
// Drop a pin
let Shalvata = MKPointAnnotation()
Shalvata.coordinate = ShalvataLocation
Shalvata.title = "Shalvata"
Shalvata.subtitle = "האנגר 28,נמל תל אביב"
mapView.addAnnotation(Shalvata)
let MarkidLocation = CLLocationCoordinate2DMake(32.074961,34.781679)
// Drop a pin
let Markid = MKPointAnnotation()
Markid.coordinate = MarkidLocation
Markid.title = "Markid"
Markid.subtitle = "אבן גבירול 30,תל אביב"
mapView.addAnnotation(Markid)
Currently the search i have:
MapViewController:
//All my Map code is here
}
}
}
extension MapViewController: HandleMapSearch {
func dropPinZoomIn(placemark:MKPlacemark){
// cache the pin
selectedPin = placemark
// clear existing pins
let annotation = MKPointAnnotation()
annotation.coordinate = placemark.coordinate
annotation.title = placemark.name
if let _ = placemark.locality,
let _ = placemark.administrativeArea {
annotation.subtitle = ""
}
mapView.addAnnotation(annotation)
let span = MKCoordinateSpanMake(0.01, 0.01)
let region = MKCoordinateRegionMake(placemark.coordinate, span)
mapView.setRegion(region, animated: true)
}
}
SearchTable:
import UIKit
import MapKit
class LocationSearchTable : UITableViewController {
var matchingItems = [CustomAnnotations]()
var mapView: MKMapView? = nil
var handleMapSearchDelegate:HandleMapSearch? = nil
func parseAddress(selectedItem:MKPlacemark) -> String {
// put a space between "4" and "Melrose Place"
let firstSpace = (selectedItem.subThoroughfare != nil && selectedItem.thoroughfare != nil) ? " " : ""
// put a comma between street and city/state
let comma = (selectedItem.subThoroughfare != nil || selectedItem.thoroughfare != nil) && (selectedItem.subAdministrativeArea != nil || selectedItem.administrativeArea != nil) ? ", " : ""
// put a space between "Washington" and "DC"
let secondSpace = (selectedItem.subAdministrativeArea != nil && selectedItem.administrativeArea != nil) ? " " : ""
let addressLine = String(
format:"%#%#%#%#%#%#%#",
// street number
selectedItem.subThoroughfare ?? "",
firstSpace,
// street name
selectedItem.thoroughfare ?? "",
comma,
// city
selectedItem.locality ?? "",
secondSpace,
// state
selectedItem.administrativeArea ?? ""
)
return addressLine
}
func search(keywords:String) {
self.matchingItems.removeAll()
for annotation in self.mapView!.annotations {
if annotation.isKindOfClass(CustomAnnotations) {
//Just an example here for searching annotation by title, you could add other filtering actions else.
if (annotation.title??.rangeOfString(keywords) != nil) {
self.matchingItems.append(annotation as! CustomAnnotations)
}
}
}
self.tableView.reloadData()
}
}
extension LocationSearchTable : UISearchResultsUpdating {
func updateSearchResultsForSearchController(searchController: UISearchController) {
guard let mapView = mapView,
let searchBarText = searchController.searchBar.text else { return }
let request = MKLocalSearchRequest()
request.naturalLanguageQuery = searchBarText
request.region = mapView.region
let search = MKLocalSearch(request: request)
search.startWithCompletionHandler { response, _ in
guard let response = response else {
return
}
self.matchingItems = response.mapItems
self.tableView.reloadData()
}
}
}
extension LocationSearchTable {
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return matchingItems.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MapSearchCell", forIndexPath: indexPath)
let selectedItem = matchingItems[indexPath.row]
cell.textLabel?.text = selectedItem.title
cell.detailTextLabel?.text = selectedItem.subtitle
return cell
}
}
extension LocationSearchTable {
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let selectedItem = matchingItems[indexPath.row]//.placemark
handleMapSearchDelegate?.dropPinZoomIn(selectedItem)
dismissViewControllerAnimated(true, completion: nil)
}
}
My question is how i can turn this to only search my annotations and not search all over the world with MKLocalSearch.
I'm a beginner coder using 2.3 and Xcode 8
Thanks you for helping.
Errors From Answer :

Answer 1

(Swift 3, just take main idea for reference if it's not convenient to convert Swift version)
First, define a custom class inherited from MKPointAnnotation for distinguishing your annotations from others:
class CustomedAnnottion: MKPointAnnotation{
//You can also add some varible for saving custom data, like: var id:Int?
}
Second, add the annotations with your custom annotation class:
let ShalvataLocation = CLLocationCoordinate2DMake(32.101145,34.775163)
let Shalvata = CustomedAnnottion()
Shalvata.coordinate = ShalvataLocation
Shalvata.title = "Shalvata"
Shalvata.subtitle = "האנגר 28,נמל תל אביב"
mapView.addAnnotation(Shalvata)
Third, change your search table view datasource to:
var matchingItems = [CustomedAnnottion]()
Fourth(The most important for searching your custom annotations), implement a search function like this:
func search(keywords:String) {
self.matchingItems.removeAll()
for annotation in self.mapView.annotations {
if annotation.isKind(of: CustomedAnnottion.classForCoder()) {
//Just an example here for searching annotation by title, you could add other filtering actions else.
if (annotation.title??.range(of: keywords) != nil) {
self.matchingItems.append(annotation as! CustomedAnnottion)
}
}
}
self.tableView.reloadData()
}
Finally, change the tableView's 'cellForRowAtIndexPath' method to:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "MapSearchCell", for: indexPath)
let selectedItem = matchingItems[indexPath.row]
cell.textLabel?.text = selectedItem.title
cell.detailTextLabel?.text = selectedItem.subtitle
return cell
}
These are general steps for implementing your requirements, feel free to change any code to meet your specific needs.