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Wrap up

I tried to keep this project as simple as possible so that you can focus on the map component, because there's a lot to learn: MKMapView, MKAnnotation, MKPinAnnotationView, CLLocationCoordinate2D and so on, and all must be used before you get a finished product.

Again, we've only scratched the surface of what maps can do in iOS, but that just gives you more room to extend the app yourself! Try adding a UIAlertController action sheet that lets users specify how they want to view the map. There's a mapType property that draws the maps in different ways. For example, .satellite gives a satellite view of the terrain.

If you want to try something harder, you could typecast the return value from dequeueReusableAnnotationView() so that it's an MKPinAnnotationView. This will always be the case, because that's what we're creating. But once you typecast the return value, it means you can change the pinTintColor property to your favorite UIColor. With that information, try to add a "Favorite" button to cities: regular cities are red, favorites are green.

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About the author

Paul Hudson is the creator of Hacking with Swift, the most comprehensive series of Swift books in the world. He's also the editor of Swift Developer News, the maintainer of the Swift Knowledge Base, and Mario Kart world champion. OK, so that last part isn't true. If you're curious you can learn more here.

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