How to change MKMapView's user-location blue dot to an image of choice?

问题

Is it possible to change the blue dot which indicates the user's location in MKMapView to an image? For example a little car or any .png image?

回答1:

In the viewForAnnotation: method of MKMapViewDelegate probably you would be having the code like this.

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {

    if (annotation == mapView.userLocation) return nil;
    ...

We return nil if the annotation is userLocation to let the mapView display the blue dot & circle animation. In order to show our custom annotation for userLocation just remove the line return nil; and do your customization there.

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {

    static NSString* AnnotationIdentifier = @"Annotation";
    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];

    if (!pinView) {

        MKPinAnnotationView *customPinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];   
        if (annotation == mapView.userLocation){
           customPinView.image = [UIImage imageNamed:@"myCarImage.png"];
        }
        else{
            customPinView.image = [UIImage imageNamed:@"mySomeOtherImage.png"];
        }
        customPinView.animatesDrop = NO;
        customPinView.canShowCallout = YES;
        return customPinView;

    } else {

        pinView.annotation = annotation;
    }

    return pinView;
}

回答2:

Here is Swift 2.0 version in which you might have multiple pins.

In this code CustomAnnotation is just an MKAnnotation subclass. Basically if the annotation is not the kind of one of your custom classes, then its the user location pin.

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView?
{
    // This is false if its a user pin
    if(annotation.isKindOfClass(CustomAnnotation) == false)
    {
        let userPin = "userLocation"
        if let dequeuedView = _view.mapView().dequeueReusableAnnotationViewWithIdentifier(userPin)
        {
            return dequeuedView
        } else
        {
            let mkAnnotationView:MKAnnotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: userPin)
            mkAnnotationView.image = UIImage(named: C_GPS.ROUTE_WALK_ICON_NAME)
            let offset:CGPoint = CGPoint(x: 0, y: -mkAnnotationView.image!.size.height / 2)
            mkAnnotationView.centerOffset = offset

            return mkAnnotationView
        }

    }

    let annotation = annotation as? CustomAnnotation
    if(annotation == nil)
    {
        return nil
    }

    let endPointsIdentifier = "endPoint"
    if let dequeuedView = _view.mapView().dequeueReusableAnnotationViewWithIdentifier(endPointsIdentifier)
    {
        dequeuedView.image = annotation!.uiimage
        return dequeuedView
    } else
    {
        let mkAnnotationView:MKAnnotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: endPointsIdentifier)
        mkAnnotationView.image = annotation!.uiimage
        let offset:CGPoint = CGPoint(x: 0, y: -mkAnnotationView.image!.size.height / 2)
        mkAnnotationView.centerOffset = offset

        let gesture = UITapGestureRecognizer(target: self, action: "routeTouched:")
        mkAnnotationView.addGestureRecognizer(gesture)

        return mkAnnotationView
    }
}

回答3:

Ok, here is the Swift version:

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {

    let identifier = "User"

        var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)

        if annotationView == nil{
            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
            annotationView.canShowCallout = true

        } else {
            annotationView.annotation = annotation
        }

    annotationView.image = UIImage(named: "image")

    return annotationView

}

回答4:

is this to change the current location blue dot???

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> 
MKAnnotationView! {

let identifier = "User"

    var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)

    if annotationView == nil{
        annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
        annotationView.canShowCallout = true

    } else {
        annotationView.annotation = annotation
    }

    annotationView.image = UIImage(named: "image")

     return annotationView

}

回答5:

Please try this something like this. its working for me in Xcode 7 and swift 2.

    func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {

    // want to show a custom image if the annotation is the user's location.
    guard !annotation.isKindOfClass(MKUserLocation) else {
        let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "userLocation")
        annotationView.image = UIImage(named: "icon_coordinates_self")
        return annotationView
        //return nil
    }

    // for other annotation except current location 
    let annotationIdentifier = "AnnotationIdentifier"

    var annotationView: MKAnnotationView?
    if let dequeuedAnnotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(annotationIdentifier) {
        annotationView = dequeuedAnnotationView
        annotationView?.annotation = annotation
    }
    else {
        let av = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
        av.rightCalloutAccessoryView = UIButton(type: .DetailDisclosure)
        annotationView = av
    }

    if let annotationView = annotationView {
        // Configure your annotation view here
        annotationView.canShowCallout = true
        annotationView.image = UIImage(named: "Annotation_map")
    }

    return annotationView
}

来源：https://stackoverflow.com/questions/6293432/how-to-change-mkmapviews-user-location-blue-dot-to-an-image-of-choice