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

# completionHandler

The handler that graph calls at the completion of the execution.

## Declaration

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

## Discussion

Discussion Default value is nil.