---
title: CMIOExtensionPropertyState
framework: coremediaio
role: symbol
role_heading: Class
path: coremediaio/cmioextensionpropertystate
---

# CMIOExtensionPropertyState

An object that describes the state of a property.

## Declaration

```swift
class CMIOExtensionPropertyState<ObjectType> where ObjectType : AnyObject
```

## Overview

Overview Create a property state object by specifying the type of data it stores, which must be a NSString, NSNumber, NSDictionary, NSArray, or NSData. You can optionally specify attributes that restrict the range of values a property allows.

## Topics

### Creating a Property State

- [init(value:)](coremediaio/cmioextensionpropertystate/init(value:).md)
- [init(value:attributes:)](coremediaio/cmioextensionpropertystate/init(value:attributes:).md)

### Inspecting a Property State

- [value](coremediaio/cmioextensionpropertystate/value.md)
- [attributes](coremediaio/cmioextensionpropertystate/attributes.md)

### Initializers

- [init(coder:)](coremediaio/cmioextensionpropertystate/init(coder:).md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.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)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)

## See Also

### Properties

- [CMIOExtensionProperty](coremediaio/cmioextensionproperty.md)
- [CMIOExtensionPropertyAttributes](coremediaio/cmioextensionpropertyattributes.md)
- [CMIOExtensionInfoDictionaryKey](coremediaio/cmioextensioninfodictionarykey.md)
- [CMIOExtensionMachServiceNameKey](coremediaio/cmioextensionmachservicenamekey.md)