“'ViewController'与协议'CLLocationManagerDelegate'的冗余一致性”如何解决？

Question

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {
    @IBOutlet weak var mapView: MKMapView!

    let locationManager = CLLocationManager()
    let regionInMeters: Double = 10000

    override func viewDidLoad() {
        super.viewDidLoad()
        checkLocationServices()
    }

    func setupLocationManager() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
    }

    func centerViewOnUserLocation() {
        if let location = locationManager.location?.coordinate {
            let region = MKCoordinateRegion.init(center: location, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
            mapView.setRegion(region, animated: true)
        }
    }

    func checkLocationServices() {
        if CLLocationManager.locationServicesEnabled() {
            setupLocationManager()
            checkLocationAuthorization()
        } else {
            // Show alert letting the user know they have to turn this on.
        }
    }

    func checkLocationAuthorization() {
        switch CLLocationManager.authorizationStatus() {
        case .authorizedWhenInUse:
            mapView.showsUserLocation = true
            centerViewOnUserLocation()
            locationManager.startUpdatingLocation()
            break
        case .denied:
            // Show alert instructing them how to turn on permissions
            break
        case .notDetermined:
            locationManager.requestWhenInUseAuthorization()
        case .restricted:
            // Show an alert letting them know what's up
            break
        case .authorizedAlways:
            break
        }
    }
}

extension ViewController: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.last else { return }
        let region = MKCoordinateRegion.init(center: location.coordinate, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
        mapView.setRegion(region, animated: true)
    }

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        checkLocationAuthorization()
    }
}

该如何解决？它在代码的结尾。

Answer 1

更改

extension ViewController: CLLocationManagerDelegate {

到

extension ViewController {

说CLLocationManagerDelegate是多余的。这意味着您已经说过了，您无需再说了。

或者，不要早点说。在这里说，不早点说。为此，请更改

class ViewController: UIViewController, CLLocationManagerDelegate {

到

class ViewController: UIViewController {

关键是您只需要在一个地方说一次即可。