How to set Zoom In and Zoom out in Google ios sdk map using Button

Question

I'm working with GoogleMaps First Time and Want to know how Should I implement a Zoom In and Zoom out on GoogleMap with the help of +/- button... I had set The GmsCameraPosition but not clear about how to zoom in and Out Using Button... I had To button and on there Action I'm using like below

-(void)zoomOutMapView:(id)sender
{

    for (CGFloat i= 10; i<=15; i++) {
        [mapView animateToZoom:i ];
        [mapView setMinZoom:10 maxZoom:15];
    }
}

-(void)zoomInMapView:(id)sender
{
    for (CGFloat i= 10; i<=15; i--)
    {
        [mapView animateToZoom:i ];
        [mapView setMinZoom:10 maxZoom:15];
    }
}

Answer 1

create one common method for zoom In/Out the GmsCameraPosition and create the one common CGFloat in your viewcontroller.

for example

on your ViewDidLoad

CGFloat currentZoom = 10.0f;

create the common method like

-(Void)ZoominOutMap:(CGFloat)level
{
camera = [GMSCameraPosition cameraWithLatitude:locationManager.location.coordinate.latitude
                                 longitude:locationManager.location.coordinate.longitude
                                      zoom:level];
self.MapView.camera = camera;
}

if you press the + Button call like

-(void)zoomInMapView:(id)sender
{
 currentZoom = currentZoom + 1;

 [self ZoominOutMap:currentZoom];
}

if you press the - Button call like

-(void) zoomOutMapView:(id)sender
{
 currentZoom = currentZoom - 1;

 [self ZoominOutMap:currentZoom];
}

Answer 2

We have GMSCameraPosition : class that aggregates all camera position parameters

sample usage:

GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-33.8683
                                                        longitude:151.2086
                                                             zoom:6];
mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
mapView_.mapType = kGMSTypeSatellite;

we can use this camera object to set zoom level

camera.zoom = 6;

also we can re-assign camera again to map try out :)

Answer 3

Here is simple way to #ZoomInZoomOut byClicking on button in #iOS #GoogleMap #Swift

step1 : take command variable to manage zoom just like bellow

var currentZoom : Float = 10.0

step2 : change value of variable inside method/action of buttons

@IBAction func zoomIn(sender : UIButton)
{
    self.currentZoom = self.currentZoom + 1
    
}
@IBAction func zoomOut(sender : UIButton)
{
    self.currentZoom = self.currentZoom - 1
}

// you can also directly write mapView.animate method inside above IBAction 
func zoomInZoomOutGoogleMap() {
    mapView.animate(toZoom: currentZoom)
}