是閉合區(qū)域的話，可以使用下邊的方法
BMKGeometry.h
/**
*判斷點(diǎn)是否在多邊形內(nèi)
*@param point 待判斷的平面坐標(biāo)點(diǎn)
*@param polygon 目標(biāo)多邊形的頂點(diǎn)數(shù)組
*@param count 目標(biāo)多邊形頂點(diǎn)數(shù)組元素個(gè)數(shù)
*@return 如果在內(nèi)，返回YES，否則返回NO
*/
UIKIT_EXTERN BOOL BMKPolygonContainsPoint(BMKMapPoint point, BMKMapPoint *polygon, NSUInteger count);

/**
*判斷點(diǎn)是否在多邊形內(nèi)
*@param point 待判斷的經(jīng)緯度點(diǎn)
*@param polygon 目標(biāo)多邊形的頂點(diǎn)數(shù)組
*@param count 目標(biāo)多邊形頂點(diǎn)數(shù)組元素個(gè)數(shù)
*@return 如果在內(nèi)，返回YES，否則返回NO
*/
UIKIT_EXTERN BOOL BMKPolygonContainsCoordinate(CLLocationCoordinate2D point, CLLocationCoordinate2D *polygon, NSUInteger count);

判斷點(diǎn)與圓位置關(guān)系的示例代碼如下：
BOOL ptInCircle = BMKCircleContainsCoordinate(CLLocationCoordinate2DMake(39.918,116.408), CLLocationCoordinate2DMake(39.915,116.404), 1000);
除以上位置關(guān)系判斷方法外，SDK還提供獲取折線上與折線外指定位置最近點(diǎn)的方法。核心代碼如下：
BMKMapPoint *polylinePoints = new BMKMapPoint[4];//這是C++的寫法，下面是OC寫法
//BMKMapPoint *polylinePoints = (BMKMapPoint *)malloc(sizeof(CLLocationCoordinate2D) * 4);
polylinePoints[0]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915,116.404));
polylinePoints[1]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915,116.454));;
polylinePoints[2]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.975,116.524));;
polylinePoints[3]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.855,116.554));
BMKMapPoint point = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.815,116.504));
BMKMapPoint nearestPoint = BMKGetNearestMapPointFromPolyline(point, polylinePoints, 4);