距离/面积计算 最后更新时间: 2021年03月10日
iOS 地图 SDK中的 MAGeometry.h 中提供了很多计算方法，包括：计算两点距离、矩形面积、坐标转换、判断点是否圆或者多边形内等等，下面做简单介绍，具体的接口可参考：MAGeometry.h。
1、两点间的直线距离计算
根据用户指定的两个经纬度坐标点，计算这两个点间的直线距离，单位为米。代码如下:
//1.将两个经纬度点转成投影点
MAMapPoint point1 = MAMapPointForCoordinate(CLLocationCoordinate2DMake(39.989612,116.480972));
MAMapPoint point2 = MAMapPointForCoordinate(CLLocationCoordinate2DMake(39.990347,116.480441));
//2.计算距离
CLLocationDistance distance = MAMetersBetweenMapPoints(point1,point2);
//1.将两个经纬度点转成投影点
let point1 = MAMapPointForCoordinate(CLLocationCoordinate2D(latitude: 39.989612, longitude: 116.480972))
let point2 = MAMapPointForCoordinate(CLLocationCoordinate2D(latitude: 39.990347, longitude: 116.480441))
//2.计算距离
let distance = MAMetersBetweenMapPoints(point1,point2);2、判断点是否在圆形内
判断一个点是否在圆内，类似于地理围栏功能，返回YES，表示进入围栏，返回NO，表示离开围栏。
CLLocationCoordinate2D location = CLLocationCoordinate2DMake(39.989612,116.480972);
CLLocationCoordinate2D center = CLLocationCoordinate2DMake(39.990347,116.480441);
BOOL isContains = MACircleContainsCoordinate(location, center, 200);
let location = CLLocationCoordinate2D(latitude: 39.989612, longitude: 116.480972)
let center = CLLocationCoordinate2D(latitude: 39.990347, longitude: 116.480441)
let isContain = MACircleContainsCoordinate(location, center, 200)3、判断点是否在可视范围内
判断一个用户指定的annotation是否在可视区域。代码如下：
//1.将annotation的经纬度点转成投影点
MAMapPoint point = MAMapPointForCoordinate(annotation.coordinate);
//2.判断该点是否在地图可视范围
BOOL isContains = MAMapRectContainsPoint(mapview.visibleMapRect, point);
//1.将annotation的经纬度点转成投影点
let point = MAMapPointForCoordinate(annotation.centerCoordinate)
//2.判断该点是否在地图可视范围
let isContain = MAMapRectContainsPoint(mapView.visibleMapRect, point)