---
title: mmioLength
framework: Paravirtualized Graphics
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 14.0+, macOS 11.0+]
path: paravirtualizedgraphics/pgdevicedescriptor/mmiolength
---

# mmioLength

The length in bytes of the memory-mapped IO section.

## Declaration

```swift
var mmioLength: Int { get set }
```