CLLocationManagerのシングルトンクラス

クラスの定義

LocationManager.swift

import CoreLocation

let LMLocationUpdateNotification : NSString = "LMLocationUpdateNotification"

let LMLocationInfoKey : NSString = "LMLocationInfoKey"

class LocationManager: NSObject, CLLocationManagerDelegate {

    private var locationManager_: CLLocationManager
    private var currentLocation: CLLocation!

    struct Singleton {
        static let sharedInstance = LocationManager()
    }

    class var sharedInstance: LocationManager {
        return Singleton.sharedInstance
    }

    override init() {
        locationManager_ = CLLocationManager()
        locationManager_.desiredAccuracy = kCLLocationAccuracyBest
        locationManager_.distanceFilter = 100 // meters
        super.init()
        locationManager_.delegate = self
        // iOS8用のメソッドがあるかチェック        
        if (self.locationManager_.respondsToSelector("requestWhenInUseAuthorization")) {
            self.locationManager_.requestWhenInUseAuthorization()
        }
    }


    func startUpdatingLocation()
    {
        println("Starting location updates")
        self.locationManager_.startUpdatingLocation()
    }

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        println("Location service failed with error: \(error.localizedDescription)")
    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        var location = locations.last as CLLocation
        println("Location = \(location)")

        self.currentLocation = location

        var userInfo = [ LMLocationInfoKey : location]
        var center = NSNotificationCenter.defaultCenter()
        center.postNotificationName(LMLocationUpdateNotification, object:self, userInfo: userInfo)
        self.locationManager_.stopUpdatingLocation()
    }

    func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        if (status == .NotDetermined) {
            if (self.locationManager_.respondsToSelector("requestWhenInUseAuthorization")) {
                self.locationManager_.requestWhenInUseAuthorization()
            }
        }
    }
}

How to use

LocationManager.sharedInstance.startUpdatingLocation() で現在地探す。
現在地が見つかるとLMLocationUpdateNotificationが通知センターに送られるので、観測する側はその通知名を登録しておく。
userInfo辞書にはLMLocationKeyにlocationが入っている。

以下、例。

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    var center = NSNotificationCenter.defaultCenter() as NSNotificationCenter

        LocationManager.sharedInstance.startUpdatingLocation()
        center.addObserver(self, selector: "foundLocation:", name: LMLocationUpdateNotification, object: nil)
}

func foundLocation(notif:NSNotification) {
    println("foundLocation called")

    let info = notif.userInfo as NSDictionary!
    var location = info[LMLocationInfoKey] as CLLocation

    var coordinate = location.coordinate
    // ...適当に位置情報を処理
}