如何在多个ViewControllers中使用locationManager()

Question

我需要在多个viewControllers中获取zipCode和city。

以下是我目前的做法…

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()
}

一切都很好，但正如你所看到的，在多视图中这样做会导致大量代码重复(当然，我并没有显示整个代码(。

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

我想的是。。。

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

Answer 1

通常情况下，在一个持久的地方只有一个位置管理器，您可以随时从任何地方访问，比如应用程序代理或根视图控制器。

Answer 2

我试图实现一个单例CLLocationManager类，我认为您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
}
}