Wraps the specified block in an operation and adds it to the receiver.
- iOS 4.0+
- macOS 10.6+
- tvOS 9.0+
- watchOS 2.0+
The block to execute from the operation. The block takes no parameters and has no return value.
This method adds a single block to the receiver by first wrapping it in an operation object. You should not attempt to get a reference to the newly created operation object or determine its type information.