How to implement auto-complete for address using Apple Map Kit

Question

I want to auto-complete the address for the user as same as what google api provides in this link:

https://developers.google.com/maps/documentation/javascript/places

Answer 1

My answer is fully based on @George McDonnell's. I hope it helps to guys who has troubles with implementing of the last one.

import UIKit
import MapKit

class ViewController: UIViewController {

    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var tableVIew: UITableView!

    //create a completer
    lazy var searchCompleter: MKLocalSearchCompleter = {
        let sC = MKLocalSearchCompleter()
        sC.delegate = self
        return sC
    }()

    var searchSource: [String]?
}

extension ViewController: UISearchBarDelegate {
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        //change searchCompleter depends on searchBar's text
        if !searchText.isEmpty {
            searchCompleter.queryFragment = searchText
        }
    }
}

extension ViewController: UITableViewDelegate, UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return searchSource?.count ?? 0
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        //I've created SearchCell beforehand; it might be your cell type
        let cell = self.tableVIew.dequeueReusableCell(withIdentifier: "SearchCell", for: indexPath) as! SearchCell

        cell.label.text = self.searchSource?[indexPath.row]
//            + " " + searchResult.subtitle

        return cell
    }
}

extension ViewController: MKLocalSearchCompleterDelegate {
    func completerDidUpdateResults(_ completer: MKLocalSearchCompleter) {
        //get result, transform it to our needs and fill our dataSource
        self.searchSource = completer.results.map { $0.title }
        DispatchQueue.main.async {
            self.tableVIew.reloadData()
        }
    }

    func completer(_ completer: MKLocalSearchCompleter, didFailWithError error: Error) {
        //handle the error
        print(error.localizedDescription)
    }
}