About Info.plist Keys

To provide a better experience for users, iOS and OS X rely on the presence of special meta information in each app or bundle. This meta information is used in many different ways. Some of it is displayed to the user, some of it is used internally by the system to identify your app and the document types it supports, and some of it is used by the system frameworks to facilitate the launch of apps. The way an app provides its meta information to the system is through the use of a special file called an information property list file.

Property lists are a way of structuring arbitrary data and accessing it at runtime. An information property list is a specialized type of property list that contains configuration data for a bundle. The keys and values in the file describe the various behaviors and configuration options you want applied to your bundle. Xcode typically creates an information property list file for any bundle-based projects automatically and configures an initial set of keys and values with appropriate default values. You can edit the file, however, to add any keys and values that are appropriate for your project or change the default values of existing keys.

At a Glance

This document describes the keys (and corresponding values) that you can include in an information property list file. This document also includes an overview of information property list files to help you understand their importance and to provide tips on how to configure them.

The Info.plist File Configures Your App

Every app and plug-in uses an Info.plist file to store configuration data in a place where the system can easily access it. OS X and iOS use Info.plist files to determine what icon to display for a bundle, what document types an app supports, and many other behaviors that have an impact outside the bundle itself.

Core Foundation Keys Describe Common Behavior

There are many keys that you always specify, regardless of the type of bundle you are creating. Those keys start with a CF prefix and are known as the Core Foundation keys. Xcode includes the most important keys in your Info.plist automatically but there are others you must add manually.

Launch Services Keys Describe Launch-Time Behavior

Launch Services provides support for launching apps. To do this, though, it needs to know information about how your app wants to be launched. The Launch Services keys describe the way your app prefers to be launched.

Cocoa Keys Describe Behavior for Cocoa and Cocoa Touch Apps

The Cocoa and Cocoa Touch frameworks use keys to identify high-level information such as your app’s main nib file and principal class. The Cocoa keys describe those and other keys that affect how the Cocoa and Cocoa Touch frameworks initialize and run your app.

OS X Keys Describe Behavior for OS X Apps

Some OS X frameworks use keys to modify their basic behavior. Developers of Mac apps might include these keys during testing or to modify certain aspects of your app’s behavior.

iOS Keys Describe Behavior for iOS Apps

An iOS app communicates a lot of information to the system using Info.plist keys. Xcode supplies a standard Info.plist with the most important keys but most apps need to augment the standard file with additional keys describing everything from the app’s initial orientation to whether it supports file sharing.

See Also

For more information about generic property lists, including how they are structured and how you use them, see Property List Programming Guide.

Some information property list keys use Uniform Type Identifiers (UTIs) to refer to data of different types. For an introduction to UTIs and how they are specified, see Uniform Type Identifiers Overview.