---
title: subtype
framework: quartzcore
role: symbol
role_heading: Instance Property
path: quartzcore/catransition/subtype
---

# subtype

Specifies an optional subtype that indicates the direction for the predefined motion-based transitions.

## Declaration

```swift
var subtype: CATransitionSubtype? { get set }
```

## Discussion

Discussion The possible values are shown in  Common Transition Subtypes. The default is nil. This property is ignored if a custom transition is specified in the filter property.

## See Also

### Transition Properties

- [type](quartzcore/catransition/type.md)