---
title: contactDelegate
framework: spritekit
role: symbol
role_heading: Instance Property
path: spritekit/skphysicsworld/contactdelegate
---

# contactDelegate

A delegate that is called when two physics bodies come in contact with each other.

## Declaration

```swift
unowned(unsafe) var contactDelegate: (any SKPhysicsContactDelegate)? { get set }
```

## Discussion

Discussion A contact is created when two physics bodies overlap and one of the physics bodies has a contactTestBitMask property that overlaps with the other body’s categoryBitMask property. By default, a physics body’s contactTestBitMask is set to all bits cleared.