Can you explain what the WorkItem object is and what it is used for?

The WorkItem object in iOS represents a unit of work that can be scheduled and executed asynchronously. It is used to group tasks that can be started, canceled, or deferred. WorkItem allows managing code execution, for example, on a DispatchQueue, with the ability to cancel or wait for completion.

Example of creating and using a WorkItem:

let workItem = DispatchWorkItem {
    print("Executing task")
}

DispatchQueue.global().async(execute: workItem)

// Later, you can cancel the task if it has not yet been executed
workItem.cancel()