10#if MA_INCLUDE_OVERLAY_CUSTOMBUILDING
19@property (nonatomic, readonly) MACustomBuildingOverlay *customBuildingOverlay;
26- (instancetype)initWithCustomBuildingOverlay:(MACustomBuildingOverlay *)customBuildingOverlay;
该类是地图覆盖物Renderer的基类, 提供绘制overlay的接口但并无实际的实现(render相关方法只能在重写后的glRender方法中使用)
Definition MAOverlayRenderer.h:20