NSFile object lets you examine the contents of the file system and make changes to it. The
NSFile class provides convenient access to a shared file manager object that is suitable for most types of file-related manipulations. A file manager object is typically your primary mode of interaction with the file system. You use it to locate, create, copy, and move files and directories. You also use it to get information about a file or directory or change some of its attributes.
When specifying the location of files, you can use either
NSString objects. The use of the
NSURL class is generally preferred for specifying file-system items because they can convert path information to a more efficient representation internally. You can also obtain a bookmark from an
NSURL object, which is similar to an alias and offers a more sure way of locating the file or directory later.
If you are moving, copying, linking, or removing files or directories, you can use a delegate in conjunction with a file manager object to manage those operations. The delegate’s role is to affirm the operation and to decide whether to proceed when errors occur. In macOS 10.7 and later, the delegate must conform to the
In iOS 5.0 and later and in macOS 10.7 and later,
NSFile includes methods for managing items stored in iCloud. Files and directories tagged for cloud storage are synced to iCloud so that they can be made available to the user’s iOS devices and Macintosh computers. Changes to an item in one location are propagated to all other locations to ensure the items stay in sync.
The methods of the shared
NSFile object can be called from multiple threads safely. However, if you use a delegate to receive notifications about the status of move, copy, remove, and link operations, you should create a unique instance of the file manager object, assign your delegate to that object, and use that file manager to initiate your operations.