Download - iOS App Extensions

App Extensions

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App Extension

• Starting in iOS 8.0 and OS X v10.10, an app extension lets you extend custom functionality and content beyond your app and make it available to users while they’re using other apps.

• You create an app extension to enable a specific task; after users get your extension, they can use it to perform that task in a variety of contexts.

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Example• For example, if you provide an extension that

enables sharing to your social sharing website, users can use it to post a remark while they’re reading email messages or surfing the web.

• Or if you provide an extension that displays current sports scores, users can put it in Notification Center so that they can get the latest scores when they open the Today view.

• You can even create an extension that provides a custom keyboard that users can use in place of the iOS system keyboard.

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Types of Extensions• Today (iOS and OS X): widgets for the Today view of Notification Center

• Share (iOS and OS X): post content to web services or share content with others

• Actions (iOS and OS X): app extensions to view or manipulate inside another app

• Photo Editing (iOS): edit a photo or video in Apple's Photos app with extensions from a third-party apps

• Finder Sync (OS X): remote file storage in the Finder with support for Finder content annotation

• Storage Provider (iOS): an interface between files inside an app and other apps on a user's device

• Custom Keyboard (iOS): system-wide alternative keyboards

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Lifecycle of App Extension

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How an App Extension Communicates

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A running app extension can communicate indirectly with its containing app

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An app extension cannot:• Access a sharedApplication object, and so cannot use any of the

methods on that object

• Use any API marked in header files with the NS_EXTENSION_UNAVAILABLE macro

• Access the camera or microphone on an iOS device

• Perform background tasks (although an app extension can initiate uploads or downloads using anNSURLSession object)

• Receive data using AirDrop

• (An app extension can send data using AirDrop in the same way an app does: by employing theUIActivityViewController class.)

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https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIApplication_Class/index.html#//apple_ref/occ/clm/UIApplication/sharedApplication

https://developer.apple.com/library/prerelease/ios/documentation/Foundation/Reference/NSURLSession_class/index.html#//apple_ref/occ/cl/NSURLSession

https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIActivityViewController_Class/index.html#//apple_ref/occ/cl/UIActivityViewController

An app extension’s container is distinct from its containing app’s container

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App Extensions

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