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

问题

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-autocomplete?hl=en

How can i implement the same functionality using apple map kit?

I have tried to use the Geo Coder, i wrote this for example:

@IBAction func SubmitGeoCode(sender: AnyObject) {

    let address = "1 Mart"
    let coder = CLGeocoder()

    coder.geocodeAddressString(address) { (placemarks, error) -> Void in

        for placemark in placemarks! {

            let lines = placemark.addressDictionary?["FormattedAddressLines"] as? [String]

            for addressline in lines! {
                print(addressline)
            }
        }
    }
}

However the results are very disappointing.

Any Apple APIs available to implement such functionality, or should i head for google api ?

Thank you

回答1:

Update - I've created a simple example project here using Swift 3 as the original answer was written in Swift 2.

In iOS 9.3 a new class called MKLocalSearchCompleter was introduced, this allows the creation of an autocomplete solution, you simply pass in the queryFragment as below:

var searchCompleter = MKLocalSearchCompleter()
searchCompleter.delegate = self
var searchResults = [MKLocalSearchCompletion]()

searchCompleter.queryFragment = searchField.text!

Then handle the results of the query using the MKLocalSearchCompleterDelegate:

extension SearchViewController: MKLocalSearchCompleterDelegate {

    func completerDidUpdateResults(completer: MKLocalSearchCompleter) {
        searchResults = completer.results
        searchResultsTableView.reloadData()
    } 

    func completer(completer: MKLocalSearchCompleter, didFailWithError error: NSError) {
        // handle error
    }
}

And display the address results in an appropriate format:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let searchResult = searchResults[indexPath.row]
    let cell = UITableViewCell(style: .subtitle, reuseIdentifier: nil)
    cell.textLabel?.text = searchResult.title
    cell.detailTextLabel?.text = searchResult.subtitle
    return cell
}

You can then use a MKLocalCompletion object to instantiate a MKLocalSearch.Request, thus gaining access to the MKPlacemark and all other useful data:

let searchRequest = MKLocalSearch.Request(completion: completion!)
let search = MKLocalSearch(request: searchRequest)
search.startWithCompletionHandler { (response, error) in
    if error == nil {
        let coordinate = response?.mapItems[0].placemark.coordinate
    }
}

回答2:

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)
    }
}

回答3:

SAMPLE PROJECT FOR THIS ISSUE CAN BE DOWNLOAD FROM HERE

In this sample project this issue is achieved through MKLocalSearchRequest and MapKit.

It is showing autocomplete places just like google places API and can place the Annotation point on Apple's map (not on Google map, I hope that is only you are looking for.)

However it does not show as accurate result as you can get from Google Places API. As the problem is that Geocoding database is not obviously complete and Apple is not the company who leads this field - Google is.

Attaching some screenshots of the sample app, so you can see if it is useful for your requirement or not.

Hope this is what you are looking for!

来源：https://stackoverflow.com/questions/33380711/how-to-implement-auto-complete-for-address-using-apple-map-kit

标签

ios

swift

geocoding