NSIndex class represents the path to a specific node in a tree of nested array collections. This path is known as an index path.
- iOS 2.0+
- macOS 10.4+
- tvOS 9.0+
- watchOS 2.0+
Each index in an index path represents the index into an array of children from one node in the tree to another, deeper, node. For example, the index path
1 specifies the path shown in Figure 1.