Working With Annotation

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Get All Annotation

//following method returns all annotations object added on map
NSArray *allAnnotations = mapView.annotations;

Get Annotation View

for (id<MKAnnotation> annotation in mapView.annotations)
    MKAnnotationView* annotationView = [mapView viewForAnnotation:annotation];
    if (annotationView)
       // Do something with annotation view 
       // for e.g change image of annotation view
       annotationView.image = [UIImage imageNamed:@"SelectedPin.png"];

Remove All Annotations

[mapView removeAnnotations:mapView.annotations]

Remove Single Annotation

//getting all Annotation
NSArray *allAnnotations = self.myMapView.annotations;

if (allAnnotations.count > 0)
    //getting first annoation
    id <MKAnnotation> annotation=[allAnnotations firstObject];
    //removing annotation
    [mapView removeAnnotation:annotation];

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