swift 3 --- 定位和获取地理位置

1. 首先在plist文件中添加Privacy - Location When In Use Usage Description ，后边填写展示的信息

   The following app need to access to the user location to help the user to find the nearest wifi around
   

2. 创建一个nsboject类

   import CoreLocation
   
   class LocationManager: NSObject {
   
   static let shareInstance = LocationManager()
   
    let locationManager: CLLocationManager
   
   static let sharedInstance: LocationManager = {
    let instance = LocationManager()
    return instance
    }()
   
   override init() {
    self.locationManager = CLLocationManager()
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
          //使用应用程序期间允许访问位置数据
        locationManager.requestWhenInUseAuthorization()
    // 设置iOS设备是否可暂停定位来节省电池的电量。如果该属性设为“YES”，则当iOS设备不再需要定位数据时，iOS设备可以自动暂停定位。
    self.locationManager.pausesLocationUpdatesAutomatically = true
    
    super.init()
    self.locationManager.delegate = self
    
    //开启定位
    self.startUpdatingLocation()
    }
   

   func startUpdatingLocation() {
   if CLLocationManager.locationServicesEnabled(){
   locationManager.startUpdatingLocation()
   } else {
   //tell view controllers to show an alert
   self.showTurnOnLocationServiceAlert()
   }
   }

    func showTurnOnLocationServiceAlert() {
    NotificationCenter.default.post(name: Notification.Name(rawValue:"showTurnOnLocationServiceAlert"), object: nil)
   

   // NotificationCenter.default.addObserver(self, selector: #selector(self.showTurnOnLocationServiceAlert(_:)), name: Notification.Name(rawValue:"showTurnOnLocationServiceAlert"), object: nil)
   }

   //MARK - selector Methods
   func showTurnOnLocationServiceAlert(_ notification: NSNotification){
   let alert = UIAlertController(title: "Turn on Location Service", message: "To use location tracking feature of the app, please turn on the location service from the Settings app.", preferredStyle: .alert)

    let settingsAction = UIAlertAction(title: "Settings", style: .default) { (_) -> Void in
        let settingsUrl = URL(string: UIApplicationOpenSettingsURLString)
        if let url = settingsUrl {
            UIApplication.shared.open(url, options: [:], completionHandler: nil)
        }
    }
    
    let cancelAction = UIAlertAction(title: NSLocalizedString("Cancel", comment: ""), style: .cancel, handler: nil)
    alert.addAction(settingsAction)
    alert.addAction(cancelAction) 
   

   //self.present(alert, animated: true, completion: nil)
   }
   }

   extension LocationManager:CLLocationManagerDelegate{

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    
    print("hello")
    if let newLoca = locations.last {
        CLGeocoder().reverseGeocodeLocation(newLoca, completionHandler: { (pms, err) -> Void in
            if let newCoordinate = pms?.last?.location?.coordinate {
        
                manager.stopUpdatingLocation()//停止定位，节省电量，只获取一次定位
                
                let currentCoordinate = newCoordinate//记录定位点经纬度
                print("\(currentCoordinate.latitude)")
                
                //取得最后一个地标，地标中存储了详细的地址信息，注意：一个地名可能搜索出多个地址
                let placemark:CLPlacemark = (pms?.last)!
                let location = placemark.location;//位置
                let region = placemark.region;//区域
                let addressDic = placemark.addressDictionary;//详细地址信息字典,包含以下部分信息
                //                    let name=placemark.name;//地名
                //                    let thoroughfare=placemark.thoroughfare;//街道
                //                    let subThoroughfare=placemark.subThoroughfare; //街道相关信息，例如门牌等
                //                    let locality=placemark.locality; // 城市
                //                    let subLocality=placemark.subLocality; // 城市相关信息，例如标志性建筑
                //                    let administrativeArea=placemark.administrativeArea; // 州
                //                    let subAdministrativeArea=placemark.subAdministrativeArea; //其他行政区域信息
                //                    let postalCode=placemark.postalCode; //邮编
                //                    let ISOcountryCode=placemark.ISOcountryCode; //国家编码
                //                    let country=placemark.country; //国家
                //                    let inlandWater=placemark.inlandWater; //水源、湖泊
                //                    let ocean=placemark.ocean; // 海洋
                //                    let areasOfInterest=placemark.areasOfInterest; //关联的或利益相关的地标
                print(location ?? 1111,region ?? 1111,addressDic ?? 111)
            }
        })
    }
}


func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
 
    if (error as NSError).domain == kCLErrorDomain && (error as NSError).code == CLError.Code.denied.rawValue {
        //User denied your app access to location information.
        showTurnOnLocationServiceAlert()
    }
    
}

}