如何在Swift中设置初始地图位置？

import MapKit

let mapView = MKMapView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height))

let initialLocation = CLLocation(latitude: 37.7749, longitude: -122.4194)
let regionRadius: CLLocationDistance = 1000 // 以米为单位的显示区域半径

func centerMapOnLocation(location: CLLocation) {
    let coordinateRegion = MKCoordinateRegion(center: location.coordinate, latitudinalMeters: regionRadius, longitudinalMeters: regionRadius)
    mapView.setRegion(coordinateRegion, animated: true)
}

centerMapOnLocation(location: initialLocation)