快速編碼多個註釋2

Question

我創建了一個代碼，用於生成由註釋和MKCircle表示的地理位置區域。該應用程序通知用戶何時進入和退出區域。一切工作正常，但我無法弄清楚如何讓應用程序保持/顯示多個區域（僅一個註解/圈會顯示）這裏是我的一小段代碼：

override func viewDidLoad() { 
    super.viewDidLoad() 


//setup locationManager 
locationManager.delegate = self 
locationManager.distanceFilter = kCLLocationAccuracyNearestTenMeters 
locationManager.desiredAccuracy = kCLLocationAccuracyBest 
locationManager.requestAlwaysAuthorization() 

//setup mapView 
mapView.delegate = self 
mapView.showsUserLocation = true 
mapView.userTrackingMode = .Follow 

//setup test data will need to link coredata to pass in (LocationLabel, radius, address) 
    setupData("Test1", radius: 100, Address: "735 Main Rd, Clemson") 
    setupData("Test2", radius: 100, Address: "821 Main Rd, Clemson") 
    setupData("Test3", radius: 100, Address: "720 Main Rd, Clemson") 
} 

func setupData(Label: String, radius: Double, Address: String) { 
    // check if system can monitor regions 
    if CLLocationManager.isMonitoringAvailableForClass(CLCircularRegion.self) { 

     //region data need to put in its own class to read multiple regions 
     let title = Label 
     let regionRadius = radius // in meters 
     let address = Address // street, city, state zip 

     //takes in the address of a location and converts it into 2d coordinates (lat/long) 
     let geocoder = CLGeocoder() 
     geocoder.geocodeAddressString(address) { (placemarks, error) in 
      if let placemarks = placemarks { 
       if placemarks.count != 0 { 
        let coordinates = placemarks.first!.location 
        let coordinate = coordinates?.coordinate 

     //setup region this will read an object with a saved coordinate and name 
     var region = CLCircularRegion(center: CLLocationCoordinate2D(latitude: coordinate!.latitude, 
      longitude: coordinate!.longitude), radius: regionRadius, identifier: title) 
     self.locationManager.startMonitoringForRegion(region) 

     //setup annotation 
     let annotation = MKPointAnnotation() 
     annotation.coordinate = coordinate!; 
     annotation.title = "\(title)"; 
     self.mapView.addAnnotation(annotation) 

     //setup circle 
     let circle = MKCircle(centerCoordinate: coordinate!, radius: regionRadius) 
     self.mapView.addOverlay(circle) 
    } 
    else { 
     print("System can't track regions") 
    } 
      } 
     } 
    } 
} 

Answer 1

您必須實現使用MKMapViewDelegate的renderForOverlay函數實際查看已添加的疊加層。試着增加你的半徑，如果你想讓它立刻看到而不會放大。

func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer 
{ 
    if let overlay = overlay as? MKCircle 
    { 
    let circleRenderer = MKCircleRenderer(circle: overlay) 
    circleRenderer.fillColor = UIColor.blueColor() 
    return circleRenderer 
    } 

    return MKOverlayRenderer(overlay: overlay) 
}