how to get notified when your async tasks are finished in OperationQueue?
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For example with key-value-observing of the `operationCount` property. – vadian Jul 31 '18 at 06:31
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Possibly related: https://stackoverflow.com/questions/42495794/wait-for-all-operations-in-queue-to-finish-before-performing-task which contains an answer for @vadian as he mentioned in his comment :-) – Ahmad F Jul 31 '18 at 06:33