Question

我已经做了几个月的iOS开发，最近我正在开发一个总线应用程序。我目前正在模仿公共汽车＆＃39;移动并在公交车站设置多个注释。出于测试目的，我只设置了一个公共汽车站，并试图监控公共汽车何时进入该区域并退出。

奇怪的是，我的didStartMonitoringForRegion方法被称为完美，但didEnterRegion和didExitRegion方法都没有被调用。每次我运行程序时，公共汽车都会在不提示我的情况下通过停靠点。

有人可以向我解释为什么会这样，以及如何解决它？

let locationManager = CLLocationManager()
var allBusAnnotations = [MKPointAnnotation]()
var summitEastBusStations = [CLLocationCoordinate2D]()
var busStopNames = ["Dix Stadium", "Risman Plaza", "Terrace Drive", "Terrace Drive 2","C-Midway","Theatre Dr.","East Main Street","South Lincoln"]
var radius = 500 as CLLocationDistance

// 0.02 is the best zoom in factor
var mapZoomInFactor : Double = 0.02

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

    self.getBusStop()
    self.locationManager.delegate = self
    // gets the exact location of the user
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    // gets the user's location only when the app is in use and not background
    self.locationManager.requestWhenInUseAuthorization()
    self.locationManager.startUpdatingLocation()

    self.mapView.showsUserLocation = true
    self.setBusStopAnnotations(summitEastBusStations)
    // self.mapView.mapType = MKMapType.Satellite  
}
    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {

    // sends the latitude and longitude to the Apple Servers then returns the address
    CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: { (placeMarks: [AnyObject]!, error: NSError!) -> Void in

        if error != nil
        {
            println("Reverse Geocode Failed: " + error.localizedDescription)
            return
        }

        if placeMarks.count > 0
        {
            // gets the most updated location
            let pm = placeMarks.last as! CLPlacemark

            let centre = CLLocationCoordinate2D(latitude: manager.location.coordinate.latitude, longitude: manager.location.coordinate.longitude)

            // draws a circle in which the map will zoom to
            let region = MKCoordinateRegion(center: centre, span: MKCoordinateSpan(latitudeDelta: self.mapZoomInFactor, longitudeDelta: self.mapZoomInFactor))

            self.mapView.setRegion(region, animated: true)

            self.displayLocationInfo(pm)

            // self.distanceToClosestAnnotation(pm)

            self.geoFencing()

            // YOU CAN IGNORE THIS WHOLE PART. IT'S IRRELEVANT FOR THIS QUESTION
            var repeatTimes = 0
            var count = 0 
            while(count <= 7)
            {
                if count == (self.summitEastBusStations.count - 1)
                {
                    count = 1
                    ++repeatTimes
                }
                else if repeatTimes == 1
                {
                    count = 0
                    ++repeatTimes
                }
                else if repeatTimes == 2
                {
                    break
                }

                self.distanceToBusStop(pm, count: count)
                ++count
            }
        }
    })
}
    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
    println("Location Manager Failed: " + error.localizedDescription)
}

func locationManager(manager: CLLocationManager!, didStartMonitoringForRegion region: CLRegion!) {
    println("The region is monitored")
    println("The monitored region is \(region.description)")
}

func locationManager(manager: CLLocationManager!, monitoringDidFailForRegion region: CLRegion!, withError error: NSError!) {
    println("Failed to monitor the stated region")
}

func locationManager(manager: CLLocationManager!, didEnterRegion region: CLRegion!) {
    println("The bus has entered the region")
}

func locationManager(manager: CLLocationManager!, didExitRegion region: CLRegion!) {
    println("The bus has left the region")
}
func geoFencing()
{

    let rismanPlaza = CLLocationCoordinate2D(latitude: 41.1469492, longitude: -81.344068)

    var currentBusStop = CLLocation(latitude: rismanPlaza.latitude, longitude: rismanPlaza.longitude)
    addRadiusCircle(currentBusStop)

    let busStopRegion = CLCircularRegion(center: CLLocationCoordinate2D(latitude: rismanPlaza.latitude, longitude: rismanPlaza.longitude), radius: radius, identifier: busStopNames[1])

    if radius > self.locationManager.maximumRegionMonitoringDistance
    {
        radius = self.locationManager.maximumRegionMonitoringDistance
    }

    locationManager.startMonitoringForRegion(busStopRegion)

}

// creates the radius around the specified location
func addRadiusCircle(location: CLLocation)
{
    self.mapView.delegate = self
    var circle = MKCircle(centerCoordinate: location.coordinate, radius: radius)
    self.mapView.addOverlay(circle)
}

// performs the actual circle colouring
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer!
{
    if overlay is MKCircle
    {
        var circle = MKCircleRenderer(overlay: overlay)
        circle.strokeColor = UIColor.redColor()
        circle.fillColor = UIColor(red: 255, green: 0, blue: 0, alpha: 0.1)
        circle.lineWidth = 1
        return circle
    }
    else
    {
        return nil
    }
}

Answer 1

请确保[CLLocationManager regionMonitoringAvailable]返回YES和 CLLocationManager.monitoredRegions包含有效区域。

另外，来自Apple文档：

在iOS 6中，半径在1到400米之间的区域效果更好在iPhone 4S或更高版本的设备上。（在iOS 5中，具有半径的区域在iPhone 4S和更高版本的设备上，1到150米之间的效果会更好。）在这些设备上，应用程序可以期望接收适当的区域在3到5分钟内输入或区域退出通知平均，如果不是更快。

和

只要设备移动500米，应用就会收到通知或者更多来自之前的通知。不应该期待通知频率高于每五分钟一次。如果设备能够从网络中检索位置管理器的数据更有可能及时发送通知。

Answer 2

我最终使用了CLRegion.containsCoordinate(location.coordinate)方法。它的工作原理大致相同。

一旦对象进入我的设置区域，它就会返回true，从这里我可以知道它何时进入并退出该区域。

Answer 3

您的代表未触发的原因有很多。首先转到目标设置并在功能选项卡中检查是否启用了BackgroundModes 位置更新。如果它处于打开状态，则尝试通过检查来检查当前位置管理器是否包含您指定的区域 NSLog(@"Monitored Regions %@",self.locationManager.monitoredRegions);

然后，如果用户设备位于当前位置（纬度和经度） didEnterRegion ：和 didExitRegion ：代理将不会触发。使用 didDetermineState ：方法查找用户/设备是否处于被监控的当前区域。如果是这样，didDetermineState：将被触发。一旦用户离开该区域，将触发didExitRegion：

然后，如果代表不是trigerring，那么在委托中使用以下内容找到然后错误 - (void)locationManager:(CLLocationManager *)manager monitoringDidFailForRegion:(CLRegion *)region withError:(NSError *)error { NSLog(@"Failed to Monitor %@", error); }

iOS Region Monitoring无法正常工作

3 个答案: