swift 定位

iOS 8 及以上需要在info.plist文件中添加下面两个属性

　　NSLocationWhenInUseUsageDescription 使用应用期间

　　NSLocationAlwaysUsageDescription 始终

import UIKit

import CoreLocation //系统定位包

class ViewController: UIViewController,CLLocationManagerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        getCurrentLocation()
    }

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

    //CodeStart

    /// 定位对象
    let locationManager = CLLocationManager()

    /// 当前所在城市（默认空）
    var currentCity = ""

    /**
    定位获取所在城市
    */
    func getCurrentLocation(){

        locationManager.desiredAccuracy = kCLLocationAccuracyBest

        locationManager.delegate = self

        if(UIDevice.currentDevice().systemVersion>="8.0"){

            //locationManager.requestAlwaysAuthorization()

            locationManager.requestWhenInUseAuthorization()

        }

        locationManager.startUpdatingLocation()
    }

    /**
    定位失败
    */
    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        println(error.code)
    }

    /**
    定位完成调用
    */
    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {

        let cloc = locations.last as! CLLocation

        let geoCoder = CLGeocoder()

        var error = NSError()

        geoCoder.reverseGeocodeLocation(cloc, completionHandler: { (placeMarks:[AnyObject]!, error:NSError!) -> Void in
            if error == nil {

                var placeMark: AnyObject = placeMarks[0]

                var locationInfo:Dictionary = placeMark.addressDictionary

                var locationCity = locationInfo["State"] as! String

                if self.currentCity != locationCity{

                    self.currentCity = locationCity

                    println("当前定位城市：\(self.currentCity)")

                }

            }

        })

        manager.stopUpdatingLocation()

    }

}