# withMutablePixelBufferIfAvailable(_:) Writes to the underlying pixel buffer. ``` mutating func withMutablePixelBufferIfAvailable(_ body: (CVPixelBuffer) throws -> R) rethrows -> R? ``` ## Parameters `body` The closure to run with the pixel buffer. ## Discussion Use this method to writes the contents of the underlying pixel buffer. ```swift let array = MLShapedArray(mutating: pixelBuffer, shape: [2, 3]) array.withMutablePixelBuffer { backingPixelBuffer in // write backingPixelBuffer here. } ``` --- 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)