swift学习笔记（七）（定位）

代码如下：

import UIKit

import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    @IBOutlet weak var locationLabel: UILabel!  // sb里的定位显示label

    

    var locationManager: CLLocationManager!

    

    override func viewDidLoad() {

        super.viewDidLoad()

    }

    

    override func preferredStatusBarStyle() -> UIStatusBarStyle {

        return UIStatusBarStyle.LightContent

    }

    

    @IBAction func myLocationButtonDidTouch(sender: AnyObject) { // sb里的定位触发按钮

        

        locationManager = CLLocationManager()

        locationManager.delegate = self

        locationManager.desiredAccuracy = kCLLocationAccuracyBest

        locationManager.requestAlwaysAuthorization()

        locationManager.startUpdatingLocation()

        

    }

    

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    

    func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {

        

      self.locationLabel.text = "Error while updating location " + error.localizedDescription

        

    }

    

    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

        CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in

            

            if (error != nil) {

               self.locationLabel.text = "Reverse geocoder failed with error" + error!.localizedDescription

                return

            }

            

            if placemarks!.count > 0 {

                let pm = placemarks![0] 

                self.displayLocationInfo(pm)

            } else {

               self.locationLabel.text = "Problem with the data received from geocoder"

            }

        })

    }

    

    func displayLocationInfo(placemark: CLPlacemark?) {

        if let containsPlacemark = placemark {

            //stop updating location to save battery life

            locationManager.stopUpdatingLocation()

            

            let locality = (containsPlacemark.locality != nil) ? containsPlacemark.locality : ""

            let postalCode = (containsPlacemark.postalCode != nil) ? containsPlacemark.postalCode : ""

            let administrativeArea = (containsPlacemark.administrativeArea != nil) ? containsPlacemark.administrativeArea : ""

            let country = (containsPlacemark.country != nil) ? containsPlacemark.country : ""

            

            self.locationLabel.text = locality! +  postalCode! +  administrativeArea! +  country!

        }

        

    }

}

1.定位要用到coreLocation.framework, 记得在info.plist中添加键值如下:

NSLocationAlwaysUsageDescription  String    where are you

NSLocationWhenInUseUsageDescription  String   Allow to use location and can send it to me

这样就可以编写定位代码并定位了，这样会有是否允许定位的提示