如何在多个 ViewController 中使用 locationManager()

Question

我需要在多个视图控制器中获取zipCode 和city。

这是我目前的做法......

import CoreLocation
let locationManager = CLLocationManager()

class MyViewController: UIViewController, CLLocationManagerDelegate{
    override func viewDidLoad() {
        super.viewDidLoad()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
    }
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)-> Void in
            if error != nil {
                //AlertView to show the ERROR message
            }

            if placemarks!.count > 0 {
                let placemark = placemarks![0]
                self.locationManager.stopUpdatingLocation()
                let zipCode = placemark.postalCode ?? ""
                let city:String = placemark.locality ?? ""

                // Do something with zipCode
                // Do something with city
            }else{
                print("No placemarks found.")
            }
        })
    }

 func someFunction() {
    locationManager.startUpdatingLocation()
 }

一切正常，但正如您所见，在多个 viewController 中这样做会导致大量代码重复（当然，我没有展示整个代码）。

从多个视图控制器中以更实用的方式从CLLocationManager() 中检索zipCode 和city 的最常见方法是什么？

我的想法是……

 MyLocationManager.zipCode() // returns zipCode as a string 
 MyLocationManager.city() // returns city as a string 

Answer 1

通常的做法是在一个持久的地方只拥有一个位置管理器，您可以随时从任何地方访问，例如应用程序委托或根视图控制器。

Answer 2

我尝试实现一个单例CLLocationManager类，我想你可以修改下面的类来实现一些额外的方法。

import Foundation

class LocationSingleton: NSObject, CLLocationManagerDelegate {
private let locationManager = CLLocationManager()
private var latitude = 0.0
private var longitude = 0.0

static let shared = LocationSingleton()

private override init() {
    super.init()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.distanceFilter = kCLLocationAccuracyHundredMeters
    locationManager.requestAlwaysAuthorization() // you might replace this with whenInuse
    locationManager.startUpdatingLocation()
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let location = locations.last {
        latitude = location.coordinate.latitude
        longitude = location.coordinate.longitude
    }
}

private func getLatitude() -> CLLocationDegrees {
    return latitude
}

private func getLongitude() -> CLLocationDegrees {
    return longitude
}

private func zipCode() {
    // I think you can figure way out to implemet this method
}

private func city() {
    // I think you can figure way out to implemet this method
}
}