swift – 为什么LocationManager多次调用startUpdatingLocation？

import UIKit
import CoreLOCATIOn

class ViewController: UIViewController,CLLOCATIOnManagerDelegate
{

    let LOCATIOnManager = CLLOCATIOnManager()

    override func viewDidLoad()
    {
        super.viewDidLoad()

        self.LOCATIOnManager.delegate = self
        self.LOCATIOnManager.desiredAccuracy = kCLLOCATIOnAccuracyBest
        self.LOCATIOnManager.requestWhenInUseAuthorization()
        self.LOCATIOnManager.startupdatingLOCATIOn()
    }

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

    func LOCATIOnManager(manager: CLLOCATIOnManager,didupdateLOCATIOns LOCATIOns: [CLLOCATIOn]) {
        CLGeocoder().reverseGeocodeLOCATIOn(manager.LOCATIOn!,completionHandler: {(placemarks,error) -> Void in

            if (error != nil)
            {
                print("Error: " + error!.localizedDescription)
                return
            }

            if placemarks!.count > 0 {
                if let pm = placemarks?.first {
                    self.displayLOCATIOnInfo(pm)
                }
            }
            else
            {
                print("Error with the data.")
            }
        })
    }

    func displayLOCATIOnInfo(placemark: CLPlacemark)
    {

        self.LOCATIOnManager.stopupdatingLOCATIOn()
        print(placemark.locality)
        print(placemark.postalCodE)
        print(placemark.administrativeArea)
        print(placemark.country)
    }

    func LOCATIOnManager(manager: CLLOCATIOnManager,didFailWithError error: NSError)
    {
        print("Error: " + error.localizedDescription)
    }

}@H_616_16@