有没有办法根据当前用户的位置在MKMapView上创建一个大头针(一个注释)？

import MapKit

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
    @IBOutlet weak var mapView: MKMapView!
    
    let locationManager = CLLocationManager()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 请求用户授权获取位置信息
        locationManager.requestWhenInUseAuthorization()
        
        // 设置代理
        mapView.delegate = self
        locationManager.delegate = self
        
        // 显示用户当前位置
        mapView.showsUserLocation = true
        
        // 开始更新用户位置
        locationManager.startUpdatingLocation()
    }
    
    // CLLocationManagerDelegate方法，获取到用户位置后调用
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.first {
            // 创建一个大头针
            let annotation = MKPointAnnotation()
            annotation.coordinate = location.coordinate
            annotation.title = "当前位置"
            
            // 添加大头针到地图上
            mapView.addAnnotation(annotation)
            
            // 设置地图显示区域
            let region = MKCoordinateRegion(center: location.coordinate, latitudinalMeters: 1000, longitudinalMeters: 1000)
            mapView.setRegion(region, animated: true)
            
            // 停止更新用户位置
            locationManager.stopUpdatingLocation()
        }
    }
    
    // MKMapViewDelegate方法，自定义大头针样式
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if annotation is MKUserLocation {
            return nil
        }
        
        let annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "pin")
        annotationView.pinTintColor = .red
        annotationView.canShowCallout = true
        
        return annotationView
    }
}