---
title: completionHandler
framework: metalperformanceshadersgraph
role: symbol
role_heading: Instance Property
path: metalperformanceshadersgraph/mpsgraphexecutableexecutiondescriptor/completionhandler
---

# completionHandler

A notification that appears when graph-executable execution is finished.

## Declaration

```swift
var completionHandler: MPSGraphExecutableCompletionHandler { get set }
```

## Discussion

Discussion Default value is nil.