问题描述

检测MKCoordinateRegion

如何不用 MKMapView 检测 MKCoordinateRegion 有没有包括 CLLocationCoordinate2D？

我需要检测用户的位置是否属于**MKCoordinateRegion**，但是没有找到解决方法，比如**CGRectContainsCGPoint(rect, point)**。

找到了参考的代码片段：

CLLocationCoordinate2D topLeftCoordinate =
    CLLocationCoordinate2DMake(region.center.latitude
                               + (region.span.latitudeDelta/2.0),
                               region.center.longitude
                               - (region.span.longitudeDelta/2.0));

    CLLocationCoordinate2D bottomRightCoordinate =
    CLLocationCoordinate2DMake(region.center.latitude
                               - (region.span.latitudeDelta/2.0),
                               region.center.longitude
                               + (region.span.longitudeDelta/2.0));

        if (location.latitude < topLeftCoordinate.latitude || location.latitude > bottomRightCoordinate.latitude || location.longitude < bottomRightCoordinate.longitude || location.longitude > bottomRightCoordinate.longitude) {

    // Coordinate fits into the region

    }

但是不知道是不是精确计算了矩形区域，请高手帮忙解决。谢谢

解决方案

MKCoordinateRegion region = self.mapView.region;

CLLocationCoordinate2D location = user.gpsposition.coordinate;
CLLocationCoordinate2D center   = region.center;
CLLocationCoordinate2D northWestCorner, southEastCorner;

northWestCorner.latitude  = center.latitude  - (region.span.latitudeDelta  / 2.0);
northWestCorner.longitude = center.longitude - (region.span.longitudeDelta / 2.0);
southEastCorner.latitude  = center.latitude  + (region.span.latitudeDelta  / 2.0);
southEastCorner.longitude = center.longitude + (region.span.longitudeDelta / 2.0);

if (
    location.latitude  >= northWestCorner.latitude &&
    location.latitude  <= southEastCorner.latitude &&

    location.longitude >= northWestCorner.longitude &&
    location.longitude <= southEastCorner.longitude
    )
{
    // User location (location) in the region - OK :-)
    NSLog(@"Center (%f, %f) span (%f, %f) user: (%f, %f)| IN!", region.center.latitude, region.center.longitude, region.span.latitudeDelta, region.span.longitudeDelta, location.latitude, location.longitude);

}else {

    // User location (location) out of the region - NOT ok :-(
    NSLog(@"Center (%f, %f) span (%f, %f) user: (%f, %f)| OUT!", region.center.latitude, region.center.longitude, region.span.latitudeDelta, region.span.longitudeDelta, location.latitude, location.longitude);
}

我找到解决方法了。