The contents of the file wrapper as an opaque data object.
- iOS 4.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
This property may be
nil if the user modifies the contents of the file system node after you call
init, but before
NSFile has read the contents of the file. You can use the
NSFile reading option to reduce the likelihood of this problem.