(set) keyword in swift

Question

I was recently browsing through the DemoBots example from Apple and I came across:

/// The scene that is currently being presented.
private (set) var currentSceneMetadata: SceneMetadata?

What exactly does (set) do and what other options (if any) are available here?

Answer 1

It means only setter is private. So currentSceneMetadata access for get is the default--which is internal-- but that of set is private. So it can only be changed from within the same source file.

Link to confirm: https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AccessControl.html

EDIT: You could even do something like this:

public private (set) var name: String

which means name's access level for setter is private and for getter is public.