Tom Wilson

Provides a NSOperation sublass with a more advanced state machine.

Some features provided: - Easily perform asynchronous 'work' in an operation - even displaying UI such as UIAlertController's - Optionally support 'exclusiviity' guarantees across mulitple instances of the same operation class, even across multiple queues! - Operation delegate - be informed when an operation starts, finishes, or produces sub-operations

License: MIT