Surprisingly for myself, I realized that I have never implemented address autocompletion using only Apple technologies. Before, I had experience only with Google Places SDK and even with the not-so-well-known European GeoDataHub. I found it curious — to know how we can limit ourselves to using only SwiftUI and MapKit to solve a similar problem.
TL;DR
GitHub - maxkalik/address-autocomplete-swiftui: SwiftUI solution of Address autocomplete
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MapKit
Before starting let’s briefly describe MapKit — a powerful framework invented by Apple. See documentation:
Display map or satellite imagery within your app, call out points of interest, and determine placemark information for map coordinates.
The framework includes a bunch of useful things. I will list only what we are going to use: the Map itself (MapView for SwiftUI); MKCoordinateRegion — this model will allow showing a particular region on the map; MKAnnotation — another model with coordinates and other data for showing MapMarker on the map, and MKLocalSearch engine which we are going to use to get a list of completions from searchable address. To implement this we need to useMKLocalSearchCompleterDelegate and MKLocalSearchCompleter where we can get results — possible addresses.