iOS谷歌地图sdk GMSMarker定位 [英] iOS google maps sdk GMSMarker positioning

问题描述

我正在使用Google地图，我可以使用

I am working with Google maps and I am able to center the map to the GMSMarker by using

 GMSCameraPosition *camera =
    [[GMSCameraPosition alloc] initWithTarget:marker.position
                                         zoom:MAP_ZOOM_LEVEL
                                      bearing:0
                                 viewingAngle:0];
    [mapView animateToCameraPosition:camera];

我正在显示尺寸为200 * 150的自定义标注，当相机位置时，其中一部分被隐藏已更改，但我希望标注位于中心，地图点位于其下方。任何想法如何做到这一点。

I am showing a custom callout of size 200*150 and part of it gets hidden when the camera position is changed but I want the callout to be in the center and the map point to be below it. Any ideas how to do this.

推荐答案

看一下使用 GMSProjection 。要将地图中心从标记位置移动100px，您可以执行以下操作：

Have a look at using GMSProjection. To shift the center of the map 100px from the markers location you would do something like:

- (BOOL)mapView:(GMSMapView *)mapView didTapMarker:(GMSMarker *)marker {
  CGPoint point = [mapView_.projection pointForCoordinate:marker.position];
  point.x = point.x + 100;
  GMSCameraUpdate *camera =
      [GMSCameraUpdate setTarget:[mapView_.projection coordinateForPoint:point]];
  [mapView_ animateWithCameraUpdate:camera];
  return YES;
}

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