Returns an action associated with a specific key.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 3.0+
A string that uniquely identifies an action.
If an action exists that matches the key, the action object is returned. Otherwise,
nil is returned.
Adds an action to the list of actions executed by the node.
Adds an action to the list of actions executed by the node and schedules the argument block to be run upon completion of the action.
A speed modifier applied to all actions executed by a node and its descendants.
A Boolean value that determines whether actions on the node and its descendants are processed.
Returns a Boolean value that indicates whether the node is executing actions.