第三天:Swift利用CoreLocation获取当前地址

 1 import UIKit
 2 import CoreLocation
 3 
 4 class ViewController: UIViewController, CLLocationManagerDelegate {
 5     
 6     @IBOutlet weak var showLocationBtn: UIButton!
 7     @IBOutlet weak var locationLabel: UILabel!
 8     
 9     var locationManager: CLLocationManager!
10     
11     override func viewDidLoad() {
12         super.viewDidLoad()
13         // Do any additional setup after loading the view, typically from a nib.
14         
15         UIApplication.shared.statusBarStyle = .lightContent
16         
17     }
18 
19     @IBAction func showLocationAction(_ sender: UIButton) {
20         
21         locationManager = CLLocationManager()
22         locationManager.delegate = self
23         
24         locationManager.desiredAccuracy = kCLLocationAccuracyBest
25         locationManager.requestAlwaysAuthorization()
26         locationManager.startUpdatingLocation()
27     }
28     
29     override func didReceiveMemoryWarning() {
30         super.didReceiveMemoryWarning()
31         // Dispose of any resources that can be recreated.
32     }
33 
34 }
35 
36 extension ViewController {
37     func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
38         self.locationLabel.text = "Error while updating location: " + error.localizedDescription
39     }
40     
41     func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
42         CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {
43             (placemarks, error) -> Void in
44             
45                 if error != nil {
46                 self.locationLabel.text = "Reverse geocoder failed with error:" + error!.localizedDescription
47                 return
48             }
49             
50             if placemarks!.count > 0 {
51                 let pm = placemarks![0]
52                 self.displayLocationInfo(pm)
53             } else {
54                 self.locationLabel.text = "Error existed in the data received from geocoder"
55             }
56         })
57     }
58     
59     func displayLocationInfo(_ placemark: CLPlacemark?) {
60         guard let containsPlacemark = placemark else {return}
61         
62         locationManager.stopUpdatingLocation()
63         
64         let locality = (containsPlacemark.locality != nil) ? containsPlacemark.locality : ""
65         let postalCode = (containsPlacemark.postalCode != nil) ? containsPlacemark.postalCode : ""
66         let adminstrativeArea = (containsPlacemark.administrativeArea != nil) ? containsPlacemark.administrativeArea : ""
67         let country = (containsPlacemark.country != nil) ? containsPlacemark.country : ""
68         
69         self.locationLabel.text = postalCode! + " " + locality!
70         self.locationLabel.text?.append("\n")
71         self.locationLabel.text?.append(adminstrativeArea! + ", " + country!)
72     }
73 }