Starting with Objective-C 2. For more on notifications, see Notifications. Sending that object a retain message increments the retain count, while sending it a release message decrements the retain count. You can use the NSFileManager class in the Foundation framework to access and enumerate file and directory contents. This framework, in the Core Services layer, defines the basic behavior of objects, establishes mechanisms for their management, and provides objects for primitive data types, collections, and operating-system services.
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