Swift-将MKAnnotationView添加到MKMapView

小编典典

Swift-将MKAnnotationView添加到MKMapView

swift

我正在尝试添加内容MKAnnotationView，MKMapView但我做不到…有人可以帮助我吗？

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
}

阅读 304

2020-07-07

共1个答案

小编典典

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

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，当您要使用自己的自定义图像时，需要创建一个普通
MKAnnotationView图像。本MKPinAnnotationView应只用于标准引脚注解。

另请注意，您不应locationManager.location在致电后立即尝试访问startUpdatingLocation。可能尚未准备好。

使用didUpdateLocations委托方法。

您还需要致电requestAlwaysAuthorization/requestWhenInUseAuthorization

2020-07-07