Smooth Scrolling on Google Maps SDK for iOS

Question

So I want to limit the Google Maps scrollable area to a certain rectangle on the map based off of the latitude and Longitude values. In order to do this I've written the following code:

-(void) viewDidLoad{
    startLat = 43.331635f;
    startLong = -74.472913f;
    endLat = 43.329106f;
    endLong = -74.470589f;
    float cameraPosLat = (startLat + endLat) / 2.0f;
    float cameraPosLong = (startLong + endLong) / 2.0f;

    GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:cameraPosLat
                                                        longitude:cameraPosLong
                                                             zoom:18];
    mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
    mapView.mapType = kGMSTypeSatellite;
    mapView.delegate = self;
    mapView.myLocationEnabled = YES;
    [mapView setMinZoom:18 maxZoom:mapView.maxZoom];
    self.view = mapView;
    marker.map = mapView;
}

-(void) mapView:(GMSMapView *)delegateMapView didChangeCameraPosition:(GMSCameraPosition *)position{
    if(delegateMapView.camera.target.latitude > startLat){
        [delegateMapView moveCamera:[GMSCameraUpdate setTarget:CLLocationCoordinate2DMake(startLat, delegateMapView.camera.target.longitude)]];
    }
    if(delegateMapView.camera.target.latitude < endLat){
        [delegateMapView moveCamera:[GMSCameraUpdate setTarget:CLLocationCoordinate2DMake(endLat, delegateMapView.camera.target.longitude)]];
    }
    if(delegateMapView.camera.target.longitude < startLong){
        [delegateMapView moveCamera:[GMSCameraUpdate setTarget:CLLocationCoordinate2DMake(delegateMapView.camera.target.latitude, startLong)]];
    }
    if(delegateMapView.camera.target.longitude > endLong){
        [delegateMapView moveCamera:[GMSCameraUpdate setTarget:CLLocationCoordinate2DMake(delegateMapView.camera.target.latitude, endLong)]];
    }
}

And this works well, it stops the map on the points that I want it to stop at, however one thing I have noticed is that on the edges of the acceptable bounds the scrolling is very jumpy, rather than smooth. I was wondering if there was any way to make sure that the map stayed within the bounds specified, while also maintaining smooth scrolling on the edges.

Any help would be greatly appreciated, thank you!

Answer 1

Try this instead:

-(void) mapView:(GMSMapView *)delegateMapView didChangeCameraPosition:(GMSCameraPosition *)position{
    if(delegateMapView.camera.target.latitude > startLat){
        [delegateMapView animateToCameraPosition:[GMSCameraPosition 
           cameraWithLatitude:startLat 
           longitude:delegateMapView.camera.target.longitude
           zoom:delegateMapView.camera.zoom]];
    }
    if(delegateMapView.camera.target.latitude < endLat){
        [delegateMapView animateToCameraPosition:[GMSCameraPosition 
           cameraWithLatitude:endLat 
           longitude:delegateMapView.camera.target.longitude
           zoom:delegateMapView.camera.zoom]];
    }
    if(delegateMapView.camera.target.longitude < startLong){
        [delegateMapView animateToCameraPosition:[GMSCameraPosition 
           cameraWithLatitude:delegateMapView.camera.target.latitude 
           longitude:startLong
           zoom:delegateMapView.camera.zoom]];
    }
    if(delegateMapView.camera.target.longitude > endLong){
        [delegateMapView animateToCameraPosition:[GMSCameraPosition 
           cameraWithLatitude:delegateMapView.camera.target.latitude 
           longitude:endLong
           zoom:delegateMapView.camera.zoom]];
    }
}