How to use delegates in Google map API for IOS 6 [

问题:

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Closed 7 years ago.

In my iphone app I am using google map SDK for showing nearby restaurants.I am able to show the places. I have some doubts..

1. How can I find out the center coordinates of the map ??

2. How to revert back to current position ?

3.How to find out the map is moved- ie center coordinates changed(just like regionChanged delegate in MKMapView)

回答1:

This should probably be three separate questions, however:

1.

GMSMapView* _mapView = ...;
CLLocationCoordinate2D centre = _mapView.camera.target;

2.

GMSMapView* _mapView = ...;
CLLocationCoordinate2D currentPosition = _mapView.myLocation.coordinate;
CGFloat currentZoom = _mapView.camera.zoom;
GMSCameraPosition* camera = 
    [GMSCameraPosition cameraWithTarget: currentPosition zoom: currentZoom];
_mapView.camera = camera;

3.

Use the [mapView:didChangeCameraPosition:] delegate method.