The block to execute when the operation has completed.
- iOS 10.0+
- macOS 10.12+
- Mac Catalyst 13.0+
- tvOS 10.0+
- watchOS 3.0+
This block is called when the operation complete. The completionBlock of the underlying NSOperation is also called if both are set.
The block is executed serially with respect to the other progress blocks of the operation. If you intend to use this block to process results, update the value of this property before executing the operation or submitting the operation object to the queue.