如何确定注释是否在MKPolygonView（iOS）中 [英] How to determine if an annotation is inside of MKPolygonView (iOS)

问题描述

我正在尝试计算特定注释（如用户位置的蓝色圆圈）或MKPinAnnotation是否在mapview上的MKPolygon图层内。

I'm trying to calculate if a specific annotation(like the blue circle of the user location) or a MKPinAnnotation is inside an MKPolygon layer on the mapview.

有什么建议吗？

推荐答案

以下内容将坐标转换为多边形视图中的CGPoint，并使用CGPathContainsPoint测试是否point位于路径中（可能是非矩形）：

The following converts the coordinate to a CGPoint in the polygon view and uses CGPathContainsPoint to test if that point is in the path (which may be non-rectangular):

CLLocationCoordinate2D mapCoordinate = ...; //user location or annot coord

MKMapPoint mapPoint = MKMapPointForCoordinate(mapCoordinate);

MKPolygonView *polygonView = 
    (MKPolygonView *)[mapView viewForOverlay:polygonOverlay];

CGPoint polygonViewPoint = [polygonView pointForMapPoint:mapPoint];

BOOL mapCoordinateIsInPolygon = 
    CGPathContainsPoint(polygonView.path, NULL, polygonViewPoint, NO);

这应该适用于任何作为MKOverlayPathView子类的覆盖视图。实际上，你可以用MKOverlayPathView替换MKPolygonView。

This should work with any overlay view that is a subclass of MKOverlayPathView. You can actually replace MKPolygonView with MKOverlayPathView in the example.

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