# mapViewDidChangeVisibleRegion(_:) Tells the delegate when the map view’s visible region changes. ``` optional func mapViewDidChangeVisibleRegion(_ mapView: MKMapView) ``` ## Parameters `mapView` The map view with the visible region that changes. ## Discussion Use this method to update the map in response to intermediate changes to the region. The map view calls this method each time the value of its visible region changes. > Important: > Because the map may call this method many times during the scrolling of the map, your implementation needs to be lightweight. Use this method to record the new region values or to make fast updates to your app’s interface. Don’t start any long-running synchronous tasks in this method. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)