用iOS7检测MKPolygon中的一个点(CGPathContainsPoint)

Question

在我今年早些时候提出的SO问题中,我得到了这段代码:

MKPolygonView *polygonView = (MKPolygonView *)[self.mapView viewForOverlay:polygon];
MKMapPoint mapPoint = MKMapPointForCoordinate(tapCoord);
CGPoint polygonViewPoint = [polygonView pointForMapPoint:mapPoint];

if (CGPathContainsPoint(polygonView.path, NULL, polygonViewPoint, FALSE)) {
    // do stuff
}

这在iOS7之前很有用.它现在总是返回false,并且不会检测带路径的点.

我正在尝试找到任何说明该方法更改的文档,但找不到任何文档.

任何想法为什么它破了？还是新的解决方案？

Answer 1

由于某种原因(可能是一个错误),该path属性NULL在当前版本的iOS 7中返回.

解决方法是CGPathRef从points多边形构造自己的.
使用此方法,您不需要引用MKPolygonView或MKPolygonRenderer.

例如:

CGMutablePathRef mpr = CGPathCreateMutable();

MKMapPoint *polygonPoints = myPolygon.points;
//myPolygon is the MKPolygon

for (int p=0; p < myPolygon.pointCount; p++)
{
    MKMapPoint mp = polygonPoints[p];
    if (p == 0)
        CGPathMoveToPoint(mpr, NULL, mp.x, mp.y);
    else
        CGPathAddLineToPoint(mpr, NULL, mp.x, mp.y);
}

CGPoint mapPointAsCGP = CGPointMake(mapPoint.x, mapPoint.y);
//mapPoint above is the MKMapPoint of the coordinate we are testing.
//Putting it in a CGPoint because that's what CGPathContainsPoint wants.

BOOL pointIsInPolygon = CGPathContainsPoint(mpr, NULL, mapPointAsCGP, FALSE);

CGPathRelease(mpr);

这应该适用于iOS 6.
但是,仅当叠加视图的path属性返回时,您可能希望执行此手动构造NULL.