---
title: boundaries
framework: uikit
role: symbol
role_heading: Type Property
path: uikit/uicollisionbehavior/mode/boundaries
---

# boundaries

Specifies that the dynamic items, associated with the collision behavior, collide only with specified collision boundaries and don’t collide with each other.

## Declaration

```swift
static var boundaries: UICollisionBehavior.Mode { get }
```

## See Also

### Constants

- [items](uikit/uicollisionbehavior/mode/items.md)
- [everything](uikit/uicollisionbehavior/mode/everything.md)