ios - 检测点是否在MKPolygon覆盖内

我想知道水龙头是否在MKPolygon中。

我有一个MKPolygon:

CLLocationCoordinate2D  points[4];

points[0] = CLLocationCoordinate2DMake(41.000512, -109.050116);
points[1] = CLLocationCoordinate2DMake(41.002371, -102.052066);
points[2] = CLLocationCoordinate2DMake(36.993076, -102.041981);
points[3] = CLLocationCoordinate2DMake(36.99892, -109.045267);

MKPolygon* poly = [MKPolygon polygonWithCoordinates:points count:4];

[self.mapView addOverlay:poly];

//create UIGestureRecognizer to detect a tap
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(foundTap:)];
tapRecognizer.numberOfTapsRequired = 1;
tapRecognizer.numberOfTouchesRequired = 1;
[self.mapView addGestureRecognizer:tapRecognizer];

它只是科罗拉多州的基本轮廓。

我设置了经纬度/经度转换的设置:

-(IBAction)foundTap:(UITapGestureRecognizer *)recognizer
{
    CGPoint point = [recognizer locationInView:self.mapView];

    CLLocationCoordinate2D tapPoint = [self.mapView convertPoint:point toCoordinateFromView:self.view];
}

但是我不确定如果我的点击点在MKPolygon内，该如何进行技术处理。似乎没有一种方法可以执行此检查，所以我想我需要将MKPolygon转换为CGRect并使用CGRectContainsPoint。

MKPolygon具有.points属性，但我似乎无法将其撤回。

有什么建议？

编辑:

以下两种解决方案都可以在iOS 6或更低版本中使用，但在iOS 7中可以使用。在iOS 7中，polygon.path属性始终返回NULL。安娜女士很友善地提供a solution in another SO question here。它涉及从多边形点创建您自己的路径以传递到CGPathContainsPoint()。

我的多边形的图片:

最佳答案

我创建了这个MKPolygon类别，以防有人使用。似乎运作良好。您必须考虑内部多边形(即多边形中的孔):

@interface MKPolygon (PointInPolygon)
  -(BOOL) pointInPolygon:(CLLocationCoordinate2D) point mapView: (MKMapView*) mapView;
@end

@implementation MKPolygon (PointInPolygon)

-(BOOL) pointInPolygon:(CLLocationCoordinate2D) point mapView: (MKMapView*) mapView {
    MKMapPoint mapPoint = MKMapPointForCoordinate(point);
    MKPolygonView * polygonView = (MKPolygonView*)[mapView viewForOverlay:self];
    CGPoint polygonViewPoint = [polygonView pointForMapPoint:mapPoint];
    return CGPathContainsPoint(polygonView.path, NULL, polygonViewPoint, NO) &&
        ![self pointInInteriorPolygons:point mapView:mapView];
}

-(BOOL) pointInInteriorPolygons:(CLLocationCoordinate2D) point mapView: (MKMapView*) mapView {
    return [self pointInInteriorPolygonIndex:0 point:point mapView:mapView];
}

-(BOOL) pointInInteriorPolygonIndex:(int) index point:(CLLocationCoordinate2D) point mapView: (MKMapView*) mapView {
    if(index >= [self.interiorPolygons count])
        return NO;
    return [[self.interiorPolygons objectAtIndex:index] pointInPolygon:point mapView:mapView] || [self pointInInteriorPolygonIndex:(index+1) point:point mapView:mapView];
}

@end

关于ios - 检测点是否在MKPolygon覆盖内，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10109677/