---
title: AVMutableCaptionRegion
framework: avfoundation
role: symbol
role_heading: Class
path: avfoundation/avmutablecaptionregion
---

# AVMutableCaptionRegion

A mutable caption region subclass that you use to create new caption regions.

## Declaration

```swift
class AVMutableCaptionRegion
```

## Topics

### Creating a caption region

- [init()](avfoundation/avmutablecaptionregion/init().md)
- [init(identifier:)](avfoundation/avmutablecaptionregion/init(identifier:).md)

### Configuring the region

- [origin](avfoundation/avmutablecaptionregion/origin.md)
- [size](avfoundation/avmutablecaptionregion/size.md)
- [displayAlignment](avfoundation/avmutablecaptionregion/displayalignment.md)
- [scroll](avfoundation/avmutablecaptionregion/scroll.md)
- [writingMode](avfoundation/avmutablecaptionregion/writingmode.md)

## Relationships

### Inherits From

- [AVCaptionRegion](avfoundation/avcaptionregion.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSCopying](foundation/nscopying.md)
- [NSMutableCopying](foundation/nsmutablecopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)

## See Also

### Regions

- [AVCaptionRegion](avfoundation/avcaptionregion.md)