A Swift extension to Google's GMSPlacePicker. Decoupling our code a little bit more ;)

GMSPlacePickerExtension.swift

enum Result<T> {
    case success(T)
    case failure(Error)
}

protocol PlacePicker {
    func pick(result: @escaping (Result<Place>) -> Void)
}

protocol Place {
    var extendedName: String {get}
}

extension GMSPlacePicker: PlacePicker {
    func pick(result: @escaping (Result<Place>) -> Void) {
        pickPlace { (place: GMSPlace?, error: Error?) in
            guard let place = place else {
                let errorFoo = NSError(domain: "foo", code: -1, userInfo: nil)
                result(.failure(errorFoo))
                return
            }
            if let error = error {
                result(.failure(error))
                return
            }

            result(.success(place))
        }
    }
}

extension GMSPlace: Place {
    // name - city - state
    var extendedName: String {
        let localName = name

        let city = addressComponents?.filter { $0.type == "locality" }.first?.name
        let state = addressComponents?.filter { $0.type == "administrative_area_level_1" }.first?.name

        var extended = "\(localName)"
        if let city = city {
            extended.append(" - \(city)")
        }
        if let state = state {
            extended.append(" - \(state)")
        }

        return extended
    }
}