如何使用audioFileUrls实现OperationQueue-Swift-Xcode 11 beta 5

Question

I am trying to implement NSOperationQueue in order to be able to cancel a process which merges audio files (using (audioFileUrls: NSArray) method) but I don't know how to implement it, I am getting confused by the different exemples accessibles. Could someone add the missing code in the exemple I am providing here? Thanks.

Import Cocoa
Import AVFoundation

let queue = OperationQueue.main

@IBAction func build(_ sender: NSButton){
   builder()
}

@IBAction func cancel(_ sender: NSButton){
   queue.cancelAllOperations()
}

func builder() {
   queue.maxConcurrentOperationCount = 1                   
   queue.addOperation {...}
}

Answer 1

You should create your own queue

lazy var myOperationQueue: OperationQueue = {
    var queue = OperationQueue()
    queue.name = "Image merge queue"
    queue.maxConcurrentOperationCount = 1
    return queue
  }()

and then use it in the builder()

func builder() {
   myOperationQueue.addOperation {...}
}

Also keep in mind that cancel does not cancel operation that are currently in execution documentation

Canceling the operations does not automatically remove them from the queue or stop those that are currently executing.