---
title: kCAOnOrderIn
framework: quartzcore
role: symbol
role_heading: Global Variable
path: quartzcore/kcaonorderin
---

# kCAOnOrderIn

The identifier that represents the action taken when a layer becomes visible, either as a result being inserted into the visible layer hierarchy or the layer is no longer set as hidden.

## Declaration

```swift
let kCAOnOrderIn: String
```

## See Also

### Constants

- [kCAOnOrderOut](quartzcore/kcaonorderout.md)
- [kCATransition](quartzcore/kcatransition.md)