为什么这个函数一直在循环？

Question

func centerMapOnLocation(location: CLLocation) {
    let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
        regionRadius * 2.0, regionRadius * 2.0)
    MapOutlet.setRegion(coordinateRegion, animated: true)
}

我下面的视图控制器中上面的这个函数继续运行尽管我从来没有编写任何循环，有人可以帮助发现不正确的逻辑。这是视图控制器的其余部分

import UIKit
import MapKit
import CoreLocation


class ViewControllerPublic: UIViewController, CLLocationManagerDelegate {
let locationManager = CLLocationManager()



let initialLocation = CLLocation(latitude: 3.632488, longitude: -117.898886)
override func viewDidLoad() {
    super.viewDidLoad()
    centerMapOnLocation(initialLocation)

    // Ask for Authorisation from the User.
    self.locationManager.requestAlwaysAuthorization()

    // For use in foreground
    self.locationManager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationManager.startUpdatingLocation()
    }

}

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let locValue:CLLocationCoordinate2D = manager.location!.coordinate
    print("locations = \(locValue.latitude) \(locValue.longitude)")
    let currentLocation = CLLocation(latitude: locValue.latitude, longitude: locValue.longitude)
    centerMapOnLocation(currentLocation)
}

let regionRadius: CLLocationDistance = 2300
func centerMapOnLocation(location: CLLocation) {
    let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
        regionRadius * 2.0, regionRadius * 2.0)
    MapOutlet.setRegion(coordinateRegion, animated: true)
}

@IBOutlet weak var MapOutlet: MKMapView!

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Answer 1

你永远不会使 CLLocation manager 无效，所以正如@Ashish Kakkad 所说，只要你的位置发生最轻微的变化，你的函数就会再次被调用。如果您不想要这种行为，那么在您获得 didUpdateLocations 中的位置后，您需要执行 locationManager.stopUpdatingLocation()。或者，如果您确实希望您的应用程序在每次位置更改时更新地图，您可能需要考虑更改所需的位置精度。

为什么这个函数一直在循环？

Why does this function keep looping?

logic

mapkit

ios

swift