Swift - 将 MKAnnotationView 添加到 MKMapView

Question

我正在尝试将MKAnnotationView 添加到MKMapView，但我做不到...谁能帮帮我？

这是我的代码：

override func viewDidLoad() {
    super.viewDidLoad()
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.startUpdatingLocation()
    var latitude:CLLocationDegrees = locationManager.location.coordinate.latitude
    var longitude:CLLocationDegrees = locationManager.location.coordinate.longitude
    var homeLati: CLLocationDegrees = 40.01540192
    var homeLong: CLLocationDegrees = 20.87901079
    var latDelta:CLLocationDegrees = 0.01
    var longDelta:CLLocationDegrees = 0.01
    var theSpan:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
    var myHome:CLLocationCoordinate2D = CLLocationCoordinate2DMake(homeLati, homeLong)
    var myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
    var theRegion:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, theSpan)
    self.theMapView.setRegion(theRegion, animated: true)
    self.theMapView.mapType = MKMapType.Hybrid
    self.theMapView.showsUserLocation = true
    ///Red Pin
    var myHomePin = MKPointAnnotation()
    myHomePin.coordinate = myHome
    myHomePin.title = "Home"
    myHomePin.subtitle = "Bogdan's home"
    self.theMapView.addAnnotation(myHomePin)

    var anView:MKAnnotationView = MKAnnotationView()
    anView.annotation = myHomePin
    anView.image = UIImage(named:"xaxas")
    anView.canShowCallout = true
    anView.enabled = true
}

Answer 1

您需要实现viewForAnnotation 委托方法并从那里返回MKAnnotationView。

这是一个例子：

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
    if (annotation is MKUserLocation) {
        //if annotation is not an MKPointAnnotation (eg. MKUserLocation),
        //return nil so map draws default view for it (eg. blue dot)...
        return nil
    }

    let reuseId = "test"

    var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
    if anView == nil {
        anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        anView.image = UIImage(named:"xaxas")
        anView.canShowCallout = true
    }
    else {
        //we are re-using a view, update its annotation reference...
        anView.annotation = annotation
    }

    return anView
}

请记住，当您想使用自己的自定义图像时，您需要创建一个 plain MKAnnotationView。 MKPinAnnotationView 只能用于标准引脚注释。

还请注意，您不应在调用startUpdatingLocation 后立即尝试访问locationManager.location。它可能还没有准备好。

使用didUpdateLocations 委托方法。

您还需要致电requestAlwaysAuthorization/requestWhenInUseAuthorization（见Location Services not working in iOS 8）。

Answer 2

你要显示注解，然后你必须添加显示注解方法：

let annotation = MKPointAnnotation()
mapVew.showAnnotations([annotation], animated: true)

annotation 是MKPointAnnotation 的一个实例。

Answer 3

1- 您的地图视图应将自己委托给您的视图控制器 2-你应该实施

func mapView(aMapView: MKMapView!, viewForAnnotation annotation: CustomMapPinAnnotation!) -> MKAnnotationView!

从添加到地图的每个注释中调用此函数

3- 子类化您的注释以在 viewForAnnotation 方法中识别它们

4-在viewForAnnotation中，添加

if annotation.isKindOfClass(CustomMapPinAnnotation)
{
  // change the image here
var pinView = aMapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? YourSubclassedAnnotation
  pinView!.image = UIImage(contentsOfFile: "xyz")
}