我有一个MKMapView，可能会绘制数百个多边形。在iOS7上使用MKPolygon和MKPolygonRenderer。
我需要的是一种通过用户触摸其中一个多边形来进行操作的方法。例如，它们表示地图上的某个区域具有特定的人口密度。 在iOS6中，MKOverlays被绘制为MKOverlayViews，因此触摸检测更加直观。现在使用渲染器，我不太清楚应该如何完成这项任务。
我不确定这是否有帮助或相关，但作为参考，我将发布一些代码：
这将使用mapData将所有MKOverlays添加到MKMapView中。
-(void)drawPolygons{
self.polygonsInfo = [NSMutableDictionary dictionary];
NSArray *polygons = [self.mapData valueForKeyPath:@"polygons"];
for(NSDictionary *polygonInfo in polygons){
NSArray *polygonPoints = [polygonInfo objectForKey:@"boundary"];
int numberOfPoints = [polygonPoints count];
CLLocationCoordinate2D *coordinates = malloc(numberOfPoints * sizeof(CLLocationCoordinate2D));
for (int i = 0; i < numberOfPoints; i++){
NSDictionary *pointInfo = [polygonPoints objectAtIndex:i];
CLLocationCoordinate2D point;
point.latitude = [[pointInfo objectForKey:@"lat"] floatValue];
point.longitude = [[pointInfo objectForKey:@"long"] floatValue];
coordinates[i] = point;
}
MKPolygon *polygon = [MKPolygon polygonWithCoordinates:coordinates count:numberOfPoints];
polygon.title = [polygonInfo objectForKey:@"name"];
free(coordinates);
[self.mapView addOverlay:polygon];
[self.polygonsInfo setObject:polygonInfo forKey:polygon.title]; // Saving this element information, indexed by title, for later use on mapview delegate method
}
}
然后是每个MKOverlay返回MKOverlayRenderer的委托方法：
-(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{
/* ... */
MKPolygon *polygon = (MKPolygon*) overlay;
NSDictionary *polygonInfo = [self.polygonsInfo objectForKey:polygon.title]; // Retrieving element info by element title
NSDictionary *colorInfo = [polygonInfo objectForKey:@"color"];
MKPolygonRenderer *polygonRenderer = [[MKPolygonRenderer alloc] initWithPolygon:polygon];
polygonRenderer.fillColor = [UIColor colorWithRed:[[colorInfo objectForKey:@"red"] floatValue]
green:[[colorInfo objectForKey:@"green"] floatValue]
blue:[[colorInfo objectForKey:@"blue"] floatValue]
alpha:[[polygonInfo objectForKey:@"opacity"] floatValue]];
return polygonRenderer;
/* ... */
}