Zoom MKMapView to an MKAnnotationView's frame

Zoom MKMapView to an MKAnnotationView's frame

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I have a grouped pin that I want to zoom in on. Of course I know the coords of the pin, and have it's view rect. I just want to zoom the map to just the right region so that the cluster fully expands showing all pins (plus a bit of padding). What's a good way of doing this?

Sidenote: In my setup the cluster pin will automatically be expanded into individual pins when the zoom level increases so I'm good there. What I need to know is how to set the MapView to a new region based on the frame and coords of the cluster pin.

Start by removing the group pin

[mapView removeAnnotation:groupAnnotation];

Then add the pins in the cluster

[mapView addAnnotations:clusterAnnotations];

Then determine the region to zoom to

CLLocationDegrees minLat = 90;
CLLocationDegrees maxLat = -90;
CLLocationDegress minLong = 180;
CLLocationDegrees maxLong = -180
[clusterAnnotations enumerateUsingBlock:^(id<MKAnnotation> annotation, NSUInteger idx, BOOL *stop) {
    CLLocationCoordinate2D coordinate = annotation.coordinate;
    minLat = MIN(minLat, coordinate.latitude);
    maxLat = MAX(maxLat, coordinate.latitude);
    minLong = MIN(minLong, coordinate.longitude);
    maxLong = MAX(maxLong, coordinate.longitude);
CLLocationCoordinate2D center = CLLocationCoordinate2DMake((minLat + maxLat)/2.f, (minLong + maxLong)/2.f);
MKCoordinateSpan span = MKCoordinateSpanMake((maxLat - minLat)*1.25, (maxLong - minLong)*1.25); //1.25 is for padding
MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
[mapView setRegion:[mapView regionThatFits:region] animated:YES];

MKMapView, An annotation object is any object that conforms to the MKAnnotation protocol. Set the camera zoom range for the map view, specifying whether to use� When you show a location to your users, you might want the MKMapView to display a coordinate at a zoom-level instead of setting a region to show. This functionality is not implemented by default, so you need to extend MKMapView with a methods that do the complex calculation from a coordinate and zoom-level to a MKCoordinateRegion.

You can use:

mapView.showAnnotations(groupedAnnotations, animated: true)

This method will zoom in and position the map automatically so the annotations are all visible.

Zooms out a MKMapView to enclose all its annotations (inc. current , for (id <MKAnnotation> annotation in mapView.annotations) {. MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);. MKMapRect� Overview. Annotation views are loosely coupled to a corresponding annotation object, which is an object that conforms to the MKAnnotation protocol. When an annotation’s coordinate point is in the map's visible region, the map view asks its delegate to provide a corresponding annotation view.

When user taps the cluster pin you'll have a callback to

func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView)

Now you just need to cast your MKAnnotationView to MKClusterAnnotation, then you get access to the collection of its member pins:

if let clustered = view.annotation as? MKClusterAnnotation {
    clustered.memberAnnotations.forEach { (annotation) in
        // Calculate region boundaries

Full solution with Nick's calculations:

if let clustered = view.annotation as? MKClusterAnnotation {
    var minLat = CLLocationDegrees(exactly: 90)!
    var maxLat = CLLocationDegrees(exactly: -90)!
    var minLong = CLLocationDegrees(exactly: 180)!
    var maxLong = CLLocationDegrees(exactly: -180)!
    clustered.memberAnnotations.forEach { (annotation) in
        let coordinate = annotation.coordinate
        minLat = min(minLat, coordinate.latitude)
        maxLat = max(maxLat, coordinate.latitude)
        minLong = min(minLong, coordinate.longitude)
        maxLong = max(maxLong, coordinate.longitude)

    let centerLat = (minLat + maxLat) / 2
    let centerLong = (minLong + maxLong) / 2
    let center = CLLocationCoordinate2D(latitude: centerLat, longitude: centerLong)
    let span = MKCoordinateSpan(latitudeDelta: (maxLat - minLat) * 1.5, longitudeDelta: (maxLong - minLong) * 1.5) // with some padding
    let region = MKCoordinateRegion(center: center, span: span)

    <your MKMapView>.setRegion(region, animated: true)

Zoom MKMapView to an MKAnnotationView's frame, Zoom MKMapView to an MKAnnotationView's frame - ios. I just want to zoom the map to just the right region so that the cluster fully expands showing all pins� You want to zoom into a particular area. And to do that, you need to get coding! Open ViewController.swift and add the following below the import UIKit statement: import MapKit Next, you’ll need an outlet for the MKMapView in ViewController.swift. Add the following outlet code immediately before viewDidLoad(): @IBOutlet private var mapView: MKMapView!

MapKit Tutorial: Getting Started, In this MapKit tutorial, you'll make HonoluluArt, an app that zooms into a To conform to MKAnnotation , Artwork must subclass NSObject� Once you have an MKMapView up and running, it only takes a few lines of code more to drop pins containing placemarks. Start by making your view controller the delegate of your map view, so that we can receive events. You should also make your view controller conform to MKMapViewDelegate in code. Adding pins to the map takes two code changes.

Maps, This guide is an introduction to using MapKit to set up a map view, plot locations, and draw overlays on it in your app. A region to display to get the correct zoom level of the map. A MKAnnotationView is used to display an annotation. How do I convert distance (for example 400 meters) on MKMapView to distance for UIView? I want to show MKAnnotationView that depends on current zoom level on MKMapView. iphone objective-c xcode mkmapview mapkit

iOS - MKMapView, ios documentation: MKMapView. For setting some zoom level, let say we want to zoom user's location with user location as center and 2km of area as radius. Then, we pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation� ios,mkmapview,mkannotationview. Why don't you use this method when you click the button in you annotation view this method is fired and you can perform your custom action there. - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control { //Do whatever you want to do here.