geofencefull.swift

import UIKit
import Foundation
import CoreLocation

final class ViewController: UIViewController {

    private let locationManager: CLLocationManager = {
        let manager = CLLocationManager()
        return manager
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        locationManager.delegate = self

        if locationManager.authorizationStatus != .authorizedAlways ||
            locationManager.authorizationStatus != .authorizedWhenInUse {
            locationManager.requestAlwaysAuthorization()
        } else {
            startMonitoringArea()
        }
    }

    private func startMonitoringArea() {
        let centerLocation = CLLocationCoordinate2D(latitude: CLLocationDegrees(-23.5614),
                                                    longitude: CLLocationDegrees(-46.6559))
        let area = CLLocationDistance(1000)
        let region = CLCircularRegion(center: centerLocation,
                                      radius: area,
                                      identifier: "monitoringRegion")
        region.notifyOnExit = false
        region.notifyOnEntry = true
        locationManager.startMonitoring(for: region)
    }
}

extension ViewController: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
        print("Entrou na região")
    }

    func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
        print("Saiu da região")
    }
}