如何将MKMapView的用户位置蓝点更改为选择的图像？

Question

是否可以将在MKMapView中指示用户位置的blue dot更改为图像？例如，一辆小车或任何.png图像？

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Answer 1

在MKMapViewDelegate的viewForAnnotation:方法中，你可能会有这样的代码。

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

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

如果注释为userLocation，我们返回nil，让mapView显示蓝色的点和圆动画。为了显示我们的userLocation自定义注释，只需删除行return nil;并在那里进行自定义即可。

- (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;
}

Answer 2

这是Swift 2.0版本，其中您可能有多个引脚。

在这段代码中，CustomAnnotation只是一个MKAnnotation子类。基本上，如果注释不是您自定义类的类型，那么它就是用户位置别针。

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
    }
}

Answer 3

好的，这是Swift的版本：

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

}