Task Management

A general-purpose recorder of operations that enables undo and redo.

An interface for objects that report progress using a single progress instance.

An object that conveys ongoing progress for a given task to the user.

An abstract class that represents the code and data associated with a single task.

A queue that regulates the execution of operations.

An operation that manages the concurrent execution of one or more blocks.

An operation that manages the execution of a single encapsulated task specified as an invocation.

A timer that fires after a certain time interval has elapsed, sending a specified message to a target object.

A representation of the state of your app at a moment in time.

The interface through which a user activity instance notifies its delegate of updates.

A collection of information about the current process.

A task scheduler suitable for low priority operations that can run in the background.

A notification that can be scheduled for display in the notification center.

An action that the user can take in response to receiving a notification.

An object that delivers notifications from apps to the user.

An interface that enables customizing the behavior of the default notification center.

Access assets and other data bundled with your app.

Design patterns for broadcasting information and for subscribing to broadcasts.

Manage the interaction between an app extension and its hosting app.

Respond to problem situations in your interactions with APIs, and fine-tune your app for better debugging.

Allow users to control your app with AppleScript and other automation technologies, or run scripts from within your app.