Returns an action associated with a specific key.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+Beta
- 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.
var speed: CGFloat
A speed modifier applied to all actions executed by a node and its descendants.
var isPaused: Bool
A Boolean value that determines whether actions on the node and its descendants are processed.
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