附件是基于以下的Swift解决方案:
在info.plist中定义位置更新的App寄存器
保持locationManager一直运行
在BestForNavigation和threekm之间切换kCLLocationAccuracy(5秒获得位置)，以避免电池耗尽
这个例子在前台每1分钟更新一次位置，在后台每15分钟更新一次位置。
这个例子适用于运行在iOS 7设备上的Xcode 6 Beta 6。
在App委托中(mapView是一个指向mapView控制器的可选选项)
func applicationDidBecomeActive(application: UIApplication!) {
if appLaunched! == false { // Reference to mapView used to limit one location update per timer cycle
appLaunched = true
var appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
var window = appDelegate.window
var tabBar = window?.rootViewController as UITabBarController
var navCon = tabBar.viewControllers[0] as UINavigationController
mapView = navCon.topViewController as? MapViewController
}
self.startInitialPeriodWithTimeInterval(60.0)
}
func applicationDidEnterBackground(application: UIApplication!) {
self.startInitialPeriodWithTimeInterval(15 * 60.0)
}
func startInitialPeriodWithTimeInterval(timeInterval: NSTimeInterval) {
timer?.invalidate() // reset timer
locationManager?.desiredAccuracy = kCLLocationAccuracyBestForNavigation
timer = NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: Selector("getFirstLocationUpdate:"), userInfo: timeInterval, repeats: false)
}
func getFirstLocationUpdate(sender: NSTimer) {
let timeInterval = sender.userInfo as Double
timer?.invalidate()
mapView?.canReportLocation = true
timer = NSTimer.scheduledTimerWithTimeInterval(timeInterval, target: self, selector: Selector("waitForTimer:"), userInfo: timeInterval, repeats: true)
}
func waitForTimer(sender: NSTimer) {
let time = sender.userInfo as Double
locationManager?.desiredAccuracy = kCLLocationAccuracyBestForNavigation
finalTimer = NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: Selector("getLocationUpdate"), userInfo: nil, repeats: false)
}
func getLocationUpdate() {
finalTimer?.invalidate()
mapView?.canReportLocation = true
}
在mapView中(locationManager指向AppDelegate中的对象)
override func viewDidLoad() {
super.viewDidLoad()
var appDelegate = UIApplication.sharedApplication().delegate! as AppDelegate
locationManager = appDelegate.locationManager!
locationManager.delegate = self
canReportLocation = true
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
if canReportLocation! {
canReportLocation = false
locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers
} else {
//println("Ignore location update")
}
}
