# CMIOExtensionPropertyAttributes An object that describes the attributes of a property. ``` class CMIOExtensionPropertyAttributes where ObjectType : AnyObject ``` ## Overview Use a property attributes object to describe attributes such as the minimum and maximum values, discrete values, and read-only values. ## Topics ### Creating Property Attributes [`+ (instancetype) propertyAttributesWithMinValue:(ObjectType) minValue maxValue:(ObjectType) maxValue validValues:(NSArray *) validValues readOnly:(BOOL) readOnly;`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/propertyAttributesWithMinValue:maxValue:validValues:readOnly:) Returns a new property attributes object with the specified configuration. [`init(minValue: ObjectType?, maxValue: ObjectType?, validValues: [ObjectType]?, readOnly: Bool)`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/init(minValue:maxValue:validValues:readOnly:)) Creates a property attributes object with the specified configuration. ### Inspecting Attributes [`var isReadOnly: Bool`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/isReadOnly) A Boolean value that indicates whether a property is read-only. [`var minValue: ObjectType?`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/minValue) The minimum value a property supports. [`var maxValue: ObjectType?`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/maxValue) The maximum value a property supports. [`var validValues: [ObjectType]?`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/validValues) An array of discrete values that this property supports. ### Specifying a Read-Only Attribute [`class var readOnlyPropertyAttribute: CMIOExtensionPropertyAttributes`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/readOnlyPropertyAttribute) A class property for a read-only property attribute. ### Initializers [`init?(coder: NSCoder)`](/documentation/CoreMediaIO/CMIOExtensionPropertyAttributes/init(coder:)) ## Relationships ### Conforms To [`Hashable`](/documentation/Swift/Hashable) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`NSCopying`](/documentation/Foundation/NSCopying) [`CVarArg`](/documentation/Swift/CVarArg) [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) [`Equatable`](/documentation/Swift/Equatable) [`NSCoding`](/documentation/Foundation/NSCoding) [`NSSecureCoding`](/documentation/Foundation/NSSecureCoding) ### 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)