Google Maps for iOS - How can you tell if a marker is within the bounds of the screen?

Question

I\'m trying to figure out a straightforward way to determine in Google Maps for iOS if a given GMSMarker is within the bounds of the visible map. There seems to be solution

Answer 1

A code example based on Andy's helpful response:

- (void)snapToMarkerIfItIsOutsideViewport:(GMSMarker *)m{
    GMSVisibleRegion region = _mapView.projection.visibleRegion;
    GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] initWithRegion:region];
    if (![bounds containsCoordinate:m.position]){
        GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:m.position.latitude
                                              longitude:m.position.longitude
                                                   zoom:_mapView.camera.zoom];
        [self.mapView animateToCameraPosition: camera];
    }
}

Answer 2

The swift 4 version of the answer. Returning a boolean if marker is within the screen region or not

func isMarkerWithinScreen(marker: GMSMarker) -> Bool {
    let region = self.mapView.projection.visibleRegion()
    let bounds = GMSCoordinateBounds(region: region)
    return bounds.contains(marker.position)
}

Answer 3

Hope this code may help to code hunters.

NSMutableArray *mutArrMarkers; //Have all markers added on Map
.
.
.
.

NSMutableArray *mutArrMarkersInPath = [NSMutableArray array];
[mutArrMarkers enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
   GMSMarker *marker = obj;
   if(GMSGeometryContainsLocation(currentCoordinates, pathToCheck, YES)){
        [mutArrMarkersInPath addObject:marker];
   }
}];

Answer 4

Retrieve the bounds of your viewport with GMSVisibleRegion and create a GMSCoordinateBounds with it. Call containsCoordinate, passing in the marker's position. It should return true if the marker is within the viewport and false if not.

Answer 5

I have written on method to find GMSMarker is in particular frame. Set your rectangle frame (x,y,maxX,maxY). You can set any frame from screen it tell find marker is in that frame or not..

- (BOOL)isGoogleMapMarkerVisible:(GMSMarker*)marker {

    //Marker point
    CGPoint markerpoint = [self.mapview.projection pointForCoordinate:marker.position];

    //Maximum visible region from x and y axis
    float x = 0.0;
    float y = o.o;
    float maxX = self.mapview.frame.size.width;
    float maxY = self.mapview.frame.size.height;

    //If marker point is on visible region return true else return false
    if (markerpoint.x > x && markerpoint.y > y && markerpoint.x < maxX && markerpoint.y < maxY) {
        return YES;
    }
    else {
            return NO;
    }
}