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# SKTileGroupRule

Rules that describe how various tiles should be placed in a map.

```
class SKTileGroupRule
```

## Overview

When a tile is filled in a tile map, the tile group rule defines how neighboring tiles are populated based on adjacency rules. A rule with multiple definitions uses the placement weights of the definitions to randomly select which to use.

## Topics

### Creating a Tile Group Rule

[`init(adjacency:tileDefinitions:)`](/documentation/SpriteKit/SKTileGroupRule/init(adjacency:tileDefinitions:))

Initializes a new tile group rule with adjacency rules and tile definitions.

[`tileGroupRuleWithAdjacency:tileDefinitions:`](/documentation/SpriteKit/SKTileGroupRule/tileGroupRuleWithAdjacency:tileDefinitions:)

### Accessing or Setting Tile Group Rule Properties

[`adjacency`](/documentation/SpriteKit/SKTileGroupRule/adjacency)

The adjacency requirement for this rule.

[`SKTileAdjacencyMask`](/documentation/SpriteKit/SKTileAdjacencyMask)

An enumeration defining how neighboring tiles are automatically placed next to each other.

[`name`](/documentation/SpriteKit/SKTileGroupRule/name)

A name associated with the tile group rule.

[`tileDefinitions`](/documentation/SpriteKit/SKTileGroupRule/tileDefinitions)

The tile definitions used for this rule.


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