> For the complete documentation index, see [llms.txt](https://docs.mapsindoors.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mapsindoors.com/sdks-and-frameworks/ios/change-building-outline-color.md).

# Change Building Outline Color

To change the building outline color, along with other display properties, you must get and modify the Building Outline Display Rule.

```swift
let buildingOutline = MPMapsIndoors.shared.displayRuleFor(displayRuleType: .buildingOutline)
buildingOutline?.polygonStrokeColor = .blue
```

Note that only the polygon stroke color, width and opacity values are respected.