Zoom in a MKMapView programmatically
Solution 1
I have no idea if this is the right way to do it, but I'm using this to zoom in and out.
case 0: { // Zoom In
//NSLog(@"Zoom - IN");
MKCoordinateRegion region;
//Set Zoom level using Span
MKCoordinateSpan span;
region.center=mapView.region.center;
span.latitudeDelta=mapView.region.span.latitudeDelta /2.0002;
span.longitudeDelta=mapView.region.span.longitudeDelta /2.0002;
region.span=span;
[mapView setRegion:region animated:TRUE];
}
break;
// Zoom Out
case 2: {
//NSLog(@"Zoom - OUT");
MKCoordinateRegion region;
//Set Zoom level using Span
MKCoordinateSpan span;
region.center=mapView.region.center;
span.latitudeDelta=mapView.region.span.latitudeDelta *2;
span.longitudeDelta=mapView.region.span.longitudeDelta *2;
region.span=span;
[mapView setRegion:region animated:TRUE];
}
Solution 2
Just cleaning up dkdarel's answer
// delta is the zoom factor
// 2 will zoom out x2
// .5 will zoom in by x2
- (void)zoomMap:(MKMapView*)mapView byDelta:(float) delta {
MKCoordinateRegion region = mapView.region;
MKCoordinateSpan span = mapView.region.span;
span.latitudeDelta*=delta;
span.longitudeDelta*=delta;
region.span=span;
[mapView setRegion:region animated:YES];
}
Swift Code:
func zoomMap(byFactor delta: Double) {
var region: MKCoordinateRegion = self.mapView.region
var span: MKCoordinateSpan = mapView.region.span
span.latitudeDelta *= delta
span.longitudeDelta *= delta
region.span = span
mapView.setRegion(region, animated: true)
}
Solution 3
Here is an easier solution:
MKUserLocation *userLocation = mapView.userLocation;
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance (
userLocation.location.coordinate, 50, 50);
[mapView setRegion:region animated:NO];
Solution 4
mapView.setRegion
method has problem when your map is rotated
You can zoom map via mapView.camera.altitude
property, but it is not animated:
mapView.camera.altitude *= 1.05
You can create new camera object and set it with animation:
let currentCamera = mapView.camera
let newCamera: MKMapCamera
if #available(iOS 9.0, *) {
newCamera = MKMapCamera(lookingAtCenter: currentCamera.centerCoordinate, fromDistance: currentCamera.altitude * 2, pitch: currentCamera.pitch, heading: currentCamera.heading)
} else {
newCamera = MKMapCamera()
newCamera.centerCoordinate = currentCamera.centerCoordinate
newCamera.heading = currentCamera.heading
newCamera.altitude = currentCamera.altitude * 2
newCamera.pitch = currentCamera.pitch
}
mapView.setCamera(newCamera, animated: true)
Solution 5
Here is my way to move map to the annotation point and zoom pretty close to it. You can easily change the zoom in line CGFloat newLatDelta = 0.06f;
- (void)moveMapToAnnotation:(MKPointAnnotation*)annotation
{
CGFloat fractionLatLon = map.region.span.latitudeDelta / map.region.span.longitudeDelta;
CGFloat newLatDelta = 0.06f;
CGFloat newLonDelta = newLatDelta * fractionLatLon;
MKCoordinateRegion region = MKCoordinateRegionMake(annotation.coordinate, MKCoordinateSpanMake(newLatDelta, newLonDelta));
[map setRegion:region animated:YES];
}
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Hectoret
Updated on July 09, 2022Comments
-
Hectoret almost 2 years
I'm using a
MKMapView
inside an iPhone app. When I click a button the zoom level must increase. This is my first approach:MKCoordinateRegion zoomIn = mapView.region; zoomIn.span.latitudeDelta *= 0.5; [mapView setRegion:zoomIn animated:YES];
However, this code had no effect, since I didn't update the longitudeDelta value. So I added this line:
zoomIn.span.longitudeDelta *= 0.5;
Now it works, but only sometimes. The
latitudeDelta
andlongitudeDelta
don't change in the same way, I mean, their values are not proportional. Any idea how to solve this? -
user366584 over 12 yearsIt helps me aswell, Thanks bro
-
Vivek Shah about 9 yearsthis works fine ,but when I continually press the zoom out button it give me exception after some level. How can I prevent it ?
-
Tapas Pal almost 9 yearsThat's exactly i was looking for.. Thanx bro
-
dustinrwh over 8 yearsCool. What is the point of dividing by 2.0002 rather than 2? Just curious :)
-
Sanju about 8 yearshee Zoom -Out Code is crashing when i pressed continuously , can you tell me how to fix ?? here is the Crash Log: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid Region <center:+13.06748979, +80.24493745 span:+245.43019431, +223.01760747>'
-
Simon Moshenko almost 7 yearsI think this would be a correct swift code func zoomRegion( region: inout MKCoordinateRegion, byFactor delta: Double) { var span: MKCoordinateSpan = region.span span.latitudeDelta *= delta span.longitudeDelta *= delta region.span = span }