当在 MKMapView 上添加多个叠加层时，如何唯一地检测叠加层

Question

在我的情况下，我必须在 MKMapView 上放置多个多边形作为叠加层，这些多边形实际上是从 JSON 响应创建的，响应实际上包含 polygon_id 以及坐标为了形成那个多边形。我只想知道如何将 polygon_id 与叠加层合并，这样每当用户单击该叠加层时，它就会 return polygon_id.

这是我的代码：

-(void)darwPolyGon:(NSMutableArray *)polyArr polyGonAreaId:(NSString
*)areaID isAssign:(BOOL)isAssign{


    CLLocationCoordinate2D *coordinates =
(CLLocationCoordinate2D*)malloc(sizeof(CLLocationCoordinate2D) *
[polyArr count]);
    for (int i=0; i<polyArr.count; i++) {
        ModelPolygon *poly=[polyArr objectAtIndex:i];
        coordinates[i] = CLLocationCoordinate2DMake(poly.lat,poly.lon);

    }
    MKPolygon *polygon = [MKPolygon polygonWithCoordinates:coordinates
count:polyArr.count];
    strTapAreaId=areaID;
    polygon.title=strTapAreaId;

    [MyMapView addOverlay:polygon];


}
-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id
<MKOverlay>)overlay
{
    if([overlay isKindOfClass:[MKPolygon class]]){
        MKPolygonView *viewPoly = [[MKPolygonView alloc]
initWithOverlay:overlay];

        viewPoly.lineWidth=3;
        if (isAssignUser) {
            viewPoly.strokeColor=[UIColor colorWithRed:255/255.0f
green:30/255.0f blue:0/255.0f alpha:1.0f];

        }else
        viewPoly.strokeColor=[UIColor colorWithRed:132/255.0f
green:0/255.0f blue:255/255.0f alpha:1.0f];
        viewPoly.tag=[strTapAreaId integerValue];
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(handleMapTap:)];
        tap.cancelsTouchesInView = NO;
        tap.numberOfTapsRequired = 1;
        [MyMapView addGestureRecognizer:tap];
        return viewPoly ;
    }
    return nil;
}

-(void)handleMapTap:(UIGestureRecognizer*)tap{
    CGPoint tapPoint = [tap locationInView:MyMapView];

    CLLocationCoordinate2D tapCoord = [MyMapView convertPoint:tapPoint
toCoordinateFromView:MyMapView];
    MKMapPoint mapPoint = MKMapPointForCoordinate(tapCoord);
    CGPoint mapPointAsCGP = CGPointMake(mapPoint.x, mapPoint.y);

    for (id<MKOverlay> overlay in MyMapView.overlays) {
        if([overlay isKindOfClass:[MKPolygon class]]){
            MKPolygon *polygon = (MKPolygon*) overlay;

            CGMutablePathRef mpr = CGPathCreateMutable();

            MKMapPoint *polygonPoints = polygon.points;

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

            if(CGPathContainsPoint(mpr , NULL, mapPointAsCGP, FALSE)){
                MKPolygonView *viewPoly = [[MKPolygonView alloc]
initWithOverlay:overlay];
                NSLog(@"tag=%d",viewPoly.tag);
            }

            CGPathRelease(mpr);
        }
    }
}

Answer 1

我能想到的唯一方法是：

1- 您可以尝试在叠加层的 "title" 或 "subtitle" 属性中隐藏其 ID

2- 您可以创建一个 class 来保存 MKOverlay 及其 ID，无论何时选择它，您都可以遍历覆盖数组（class 中的覆盖数组）并添加一个 if 语句，以防所选覆盖层等于循环中的覆盖层，return 其 ID

当在 MKMapView 上添加多个叠加层时，如何唯一地检测叠加层

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