Key for determining whether the resource is a file package, returned as a Boolean
NSNumber object (read-write in macOS 10.8 and later, read-only in previous versions). A
true value means that the resource is a file package.
- iOS 4.0+
- macOS 10.6+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
If you attempt to set or clear this key’s value on a file instead of a directory, the system ignores your attempt. If the directory is defined as a package by way of its filename extension or other reason apart from this key, setting this key’s value to
false has no effect.