iOS 区域监控不起作用
<p><p>我已经做了几个月的 iOS 开发，最近我正在开发一个公交车应用程序。
我目前正在模仿公交车的运动并在公交车站上设置多个注释。出于测试目的，我只设置了一个公交车站，并试图监控公交车何时进入该区域并退出。</p>
<p>奇怪的是，我的 <code>didStartMonitoringForRegion</code> 方法被完美调用，但 <code>didEnterRegion</code> 和 <code>didExitRegion</code> 方法都没有被调用。每次我运行程序时，公共(public)汽车都会在没有提示我的情况下通过车站。</p>
<p>有人可以向我解释为什么会发生这种情况以及如何解决它吗？</p>
<pre><code>let locationManager = CLLocationManager()
var allBusAnnotations = ()
var summitEastBusStations = ()
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: !) {
// sends the latitude and longitude to the Apple Servers then returns the address
CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: { (placeMarks: !, 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)
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
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我最终改用了 <code>CLRegion.containsCoordinate(location.coordinate)</code> 方法。它的工作方式几乎相同。</p>
<p>一旦对象进入我设置的区域，它就会返回 true，从这里我可以知道它何时进入和退出该区域。</p></p>
<p style="font-size: 20px;">关于iOS 区域监控不起作用，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/32548000/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/32548000/
</a>
</p>
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