objective-c - 谷歌地图 iOS SDK : How do I get accurate latitude and longitude coordinates from a camera's visibleRegion?

Question

编辑:现在这是一个已确认的错误 this开发工具包

我正在使用 1.1.1.2311 版的 iOS SDK 谷歌地图，我正在寻找屏幕上可见 map 的边界纬度和经度坐标。

我正在使用以下代码来告诉我当前的投影是什么:

NSLog(@"\n%@,%@\n%@,%@\n%@,%@\n%@,%@\n",
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.farLeft.latitude],
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.farLeft.longitude],
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.farRight.latitude],
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.farRight.longitude],
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearLeft.latitude],
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearLeft.longitude],
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearRight.latitude],
    [NSNumber numberWithDouble:mapView.projection.visibleRegion.nearRight.longitude]);

从阅读标题来看，似乎它可能不会随着相机移动而更新。很公平......

/**
 * The GMSProjection currently used by this GMSMapView. This is a snapshot of
 * the current projection, and will not automatically update when the camera
 * moves. The projection may be nil while the render is not running (if the map
 * is not yet part of your UI, or is part of a hidden UIViewController, or you
 * have called stopRendering).
 */

但是，每次调用委托(delegate)方法时它似乎都会更新，所以我试图绘制坐标来测试它们...

对于我手机上的以下内容:

上面 NSLog 的输出为我提供了以下内容:

37.34209003645947,-122.0382353290915
37.34209003645947,-122.010769508779
37.30332095984257,-122.0382353290915
37.30332095984257,-122.010769508779

当使用 this 绘制这些坐标时我得到一个似乎不正确的投影:

这些坐标在应用程序启动时是一致的，这让我相信我一直在做错事，我误解了 visibleRegion 是什么，或者我发现了一个错误。有人愿意帮我弄清楚它是哪一个吗？

Answer 1

要获取边界纬度和经度，您必须执行以下步骤:

GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] initWithRegion:self.googleMapsView.projection.visibleRegion];

CLLocationCoordinate2D northEast = bounds.northEast;
CLLocationCoordinate2D northWest = CLLocationCoordinate2DMake(bounds.northEast.latitude, bounds.southWest.longitude);
CLLocationCoordinate2D southEast = CLLocationCoordinate2DMake(bounds.southWest.latitude, bounds.northEast.longitude);
CLLocationCoordinate2D southWest = bounds.southWest;

最好的问候罗伯特