# channelCount(_:forParameter:) Returns the number of channels in a parameter. ``` func channelCount(_ count: UnsafeMutablePointer, forParameter parameterID: Int) -> (any Error)? ``` ## Parameters `count` Receives the count of channels in the parameter `parameterID` The ID of the parameter whose channels you want to count ## Return Value Returns the number of channels in a parameter (sliders = 1, 2D points = 2, RGBA colors = 4, etc.) in the count parameter. If any errors occur, the return value will be a non-nil pointer to an NSError containing information about the error. --- 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)