# CMIOExtensionPropertyState An object that describes the state of a property. ``` class CMIOExtensionPropertyState where ObjectType : AnyObject ``` ## Overview Create a property state object by specifying the type of data it stores, which must be a , , , , or . You can optionally specify attributes that restrict the range of values a property allows. ## Topics ### Creating a Property State [`+ (instancetype) propertyStateWithValue:(ObjectType) value;`](/documentation/CoreMediaIO/CMIOExtensionPropertyState/propertyStateWithValue:) Returns a new property state with a value. [`+ (instancetype) propertyStateWithValue:(ObjectType) value attributes:(CMIOExtensionPropertyAttributes *) attributes;`](/documentation/CoreMediaIO/CMIOExtensionPropertyState/propertyStateWithValue:attributes:) Returns a new property state with a value and attributes. [`convenience init(value: ObjectType?)`](/documentation/CoreMediaIO/CMIOExtensionPropertyState/init(value:)) Creates a property state with a value. [`init(value: ObjectType?, attributes: CMIOExtensionPropertyAttributes?)`](/documentation/CoreMediaIO/CMIOExtensionPropertyState/init(value:attributes:)) Creates a property state with a value and attributes. ### Inspecting a Property State [`var value: ObjectType?`](/documentation/CoreMediaIO/CMIOExtensionPropertyState/value) The value for a property state. [`var attributes: CMIOExtensionPropertyAttributes?`](/documentation/CoreMediaIO/CMIOExtensionPropertyState/attributes) The attributes for a property state. ### Initializers [`init?(coder: NSCoder)`](/documentation/CoreMediaIO/CMIOExtensionPropertyState/init(coder:)) ## Relationships ### Conforms To [`CVarArg`](/documentation/Swift/CVarArg) [`NSSecureCoding`](/documentation/Foundation/NSSecureCoding) [`NSCoding`](/documentation/Foundation/NSCoding) [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) [`Equatable`](/documentation/Swift/Equatable) [`NSCopying`](/documentation/Foundation/NSCopying) [`Hashable`](/documentation/Swift/Hashable) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) ### Inherits From [`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)