iOS Concurrency with GCD & Operations

Sep 12 2023 · Swift 5.8, macOS 13, iOS 16, Xcode 14.3

Part 3: Operations & OperationQueues

17. Challenge: TiltShiftOperations in OperationQueue

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Previous episode: 16. OperationQueues Next episode: 18. Asynchronous Operations

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Challenge: TiltShiftOperations in OperationQueue

The playground in the starter folder has an array of input images, an empty filteredImage array to hold the tilt-shifted output images and the TiltShiftOperation subclass from video 15. Use this operation in an OperationQueue to filter all the input images.

let appendQueue = OperationQueue()
appendQueue.maxConcurrentOperationCount = 1
let filterQueue = OperationQueue()
let filterOp = TiltShiftOperation(image: image)
filterOp.completionBlock = {

guard let output = filterOp.outputImage else { return }
appendQueue.addOperation {
// In case the playground won't display the array of images:
[w 1,024 h 768, w 1,024 h 1,176, w 1,024 h 768, w 1,024 h 768, w 1,024 h 768]