MKPolygon带孔

Question

我在互联网上搜索但我无法找到答案。可以在MKPolygon中画一个洞吗？像这样：

我记得我看过这样的东西，但我不确定它是否与iOS有关。有可能这样做（如果是的话）我应该如何开始？

谢谢

Answer 1

要正确执行此操作，您应该真正查看MKPolygon的interiorPolygons部分。

Answer 2

正如@incanus指出的那样，你可以定义一个interiorPolygons数组。例如：

NSUInteger interiorCount = 5;
CLLocationCoordinate2D interiorCoordinates[interiorCount];

interiorCoordinates[0] = CLLocationCoordinate2DMake(...);
interiorCoordinates[1] = CLLocationCoordinate2DMake(...);
interiorCoordinates[2] = CLLocationCoordinate2DMake(...);
interiorCoordinates[3] = CLLocationCoordinate2DMake(...);
interiorCoordinates[4] = CLLocationCoordinate2DMake(...);

MKPolygon* interiorPolygon = [MKPolygon polygonWithCoordinates:interiorCoordinates
                                                         count:interiorCount];
interiorPolygon.title = @"interior polygon";

NSUInteger count = 5;
CLLocationCoordinate2D  coordinates[count];

coordinates[0] = CLLocationCoordinate2DMake(...);
coordinates[1] = CLLocationCoordinate2DMake(...);
coordinates[2] = CLLocationCoordinate2DMake(...);
coordinates[3] = CLLocationCoordinate2DMake(...);
coordinates[4] = CLLocationCoordinate2DMake(...);

MKPolygon* polygon = [MKPolygon polygonWithCoordinates:coordinates
                                                 count:count
                                      interiorPolygons:@[interiorPolygon]];

polygon.title = @"exterior polygon";
[self.mapView addOverlay:polygon];

产量：

归功于@incanus！