---
title: "addPresentedHandler(_:)"
framework: metal
role: symbol
role_heading: Instance Method
path: "metal/mtldrawable/addpresentedhandler(_:)"
---

# addPresentedHandler(_:)

Registers a block of code to be called immediately after the drawable is presented.

## Declaration

```swift
func addPresentedHandler(_ block: @escaping MTLDrawablePresentedHandler)
```

## Parameters

- `block`: A block of code to be invoked.

## Discussion

Discussion You can register multiple handlers for a single drawable object. The following example code schedules a presentation handler that reads the presentedTime property and uses it to derive the interval between the last and current presentation times. From that information, it determines the app’s frame rate.

## See Also

### Getting presentation information

- [presentedTime](metal/mtldrawable/presentedtime.md)