Complete addresses with Swift 4, MapKit & MKLocalSearchCompleter

MKLocalSearchCompleter.example.swift

import MapKit

class LocationController: NSObject, MKLocalSearchCompleterDelegate {
    func completerDidUpdateResults(_ completer: MKLocalSearchCompleter) {
        print(completer.results, "\n--------------------------\n")
    }
}

var locationController = LocationController()

var completer = MKLocalSearchCompleter()
completer.delegate = locationController

var searchResults = [MKLocalSearchCompletion]()
completer.queryFragment = "1 Hu"

DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
    completer.queryFragment = "1 Hump"
}

DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
    completer.queryFragment = "1 Humpybong Esplanade"
}

results

[<MKLocalSearchCompletion 0x600002583000> 1 Hughes Street (Potts Point, NSW, Australia), <MKLocalSearchCompletion 0x600002582dc0> 1 Hunter Street (Sydney, NSW, Australia), <MKLocalSearchCompletion 0x600002582d80> 1 Hunter Street (Waterloo, NSW, Australia), <MKLocalSearchCompletion 0x600002582e40> 1 Hutchinson Walk (Zetland, NSW, Australia), <MKLocalSearchCompletion 0x600002582f80> 1 Hugo Street (Redfern, NSW, Australia), <MKLocalSearchCompletion 0x600002583080> 1 Hunter Street (Woolwich, NSW, Australia), <MKLocalSearchCompletion 0x600002582f40> 1 Hunter Crescent (North Sydney, NSW, Australia), <MKLocalSearchCompletion 0x600002582e80> 1 Hume Street (Wollstonecraft, NSW, Australia), <MKLocalSearchCompletion 0x6000025830c0> 1 Hubert Street (Leichhardt, NSW, Australia), <MKLocalSearchCompletion 0x600002583100> 1 Hunter Street (Lewisham, NSW, Australia), <MKLocalSearchCompletion 0x6000025831c0> 1 Hughes Avenue (Mascot, NSW, Australia), <MKLocalSearchCompletion 0x600002583240> 1 Huntleys Point Road (Huntleys Point, NSW, Australia), <MKLocalSearchCompletion 0x600002583140> 1 Hume Highway (Greenacre, NSW, Australia), <MKLocalSearchCompletion 0x600002582fc0> 1 Humphrey Street (Rosebery, NSW, Australia), <MKLocalSearchCompletion 0x600002582ec0> 1 Hunter Street (Dover Heights, NSW, Australia)] 
--------------------------

[<MKLocalSearchCompletion 0x6000025ba840> 1 Humphrey Street (Rosebery, NSW, Australia), <MKLocalSearchCompletion 0x6000025bb240> 1 Humphreys Lane (Hurstville, NSW, Australia), <MKLocalSearchCompletion 0x6000025bb340> 1 Humphrey Street (Lidcombe, NSW, Australia), <MKLocalSearchCompletion 0x6000025bb380> 1 Humphries Road (Wakeley, NSW, Australia), <MKLocalSearchCompletion 0x6000025bb440> 1 Humphreys Road (Kincumber South, NSW, Australia)] 
--------------------------

[<MKLocalSearchCompletion 0x600002594080> 1 Humpybong Esplanade (Redcliffe, QLD, Australia)] 
--------------------------