ViewAnnotationUpdateObserver

 
public protocol ViewAnnotationUpdateObserver : AnyObject

An interface you use to detect when the map view lays out or updates visibility of annotation views.

When visible portion of a map changes, e.g. responding to the user interaction, the map view adjusts the positions and visibility of its annotation views. Implement methods of ViewAnnotationUpdateObserver to detect when the map view updates position/size for supplied annotation views. As well as when annotation views get show/hidden when going in/out of visible portion of the map.

To register an observer for view annotation updates, call the addViewAnnotationUpdateObserver(_:) method.

  • Tells the observer that the frames of the annotation views changed.

    Declaration

    Swift

    func framesDidChange(for annotationViews: [UIView])

    Parameters

    annotationViews

    The annotation views whose frames changed.

  • Tells the observer that the visibility of the annotation views changed.

    Use isHidden property to determine whether a view is visible or not.

    Declaration

    Swift

    func visibilityDidChange(for annotationViews: [UIView])

    Parameters

    annotationsViews

    The annotation vies whose visibility changed.