Hands-On Design Patterns with Swift

Using delegation

Let's create a simple class that has a location manager, which will receive location updates:

class LocationAware: NSObject {    let manager = CLLocationManager()    override init() {        super.init()        manager.delegate = self    }}

Then, we need to mark LocationAware as being CLLocationManagerDelegate. Delegation uses protocols to ensure the methods that may be called are properly implemented on the delegate:

extension LocationAware: CLLocationManagerDelegate {    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {        // do something with the updated location    }    /* more delegation methods */}

Now, with that example in mind, let's create our own delegation pattern that will facilitate communications ...