Example Operation

ExampleOperation.swift

let operationQueue = OperationQueue()

class ExampleOperation: Operation {
    var delegate: SomeDelegate
    var callbackDelegate: SomeCallbackDelegate
    var success = false // I mark this when the operation has succeeded.  Optional
    
    init(delegate: SomeDelegate, callbackDelegate: SomeCallbackDelegate) {
        self.delegate = delegate
        self.callbackDelegate = callbackDelegate
    }
    
    override func main() {
        let waitForFinish = DispatchGroup()
        waitForFinish.enter()
        
        // Do stuff here and leave when you are done
        waitForFinish.leave()
        
		    waitForFinish.wait()
          if self.isCancelled { return }
    }
}