addOverlay method
Adds a single overlay object to the map.
To remove an overlay from a map, use the -removeOverlay: method.
@param overlay The overlay object to add. This object must conform to the
MLNOverlay protocol.
Implementation
void addOverlay(MLNOverlay overlay) {
_objc_msgSend_xtuoz7(this.ref.pointer, _sel_addOverlay_, overlay.ref.pointer);
}