Use the information provided by these constants to describe the scene loading process in your app’s user interface. Because this enumeration leaves room for more detailed progress reports, you should compare the status parameter of a SCNSceneSourceStatusHandler block against these values for ordering, not for equality, as in the following example handler:
SceneKit has successfully finished loading the scene file’s contents.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.