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This presentation contains the information regarding the App Extensions which is new feature available from iOS 8
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● What is ios app Extension ?
● App Extension’s Life Cycle
● How an App Extension Communicates
● Some APIs Are Unavailable to App Extensions
● Creating an App Extension
● Distribute the Containing App
● Sharing Data with Your Containing App
● debug an app extension
● App Extension Types
What is ios app Extension ?
● An app extension is different from an app
● It is a way for you to share your app’s functionality with other
apps
● you must use an app to contain and deliver your extensions
● To distribute app extensions to users, you submit a containing
app to the App Store. When a user installs your containing app,
the extensions it contains are also installed
● You can use Objective-C or Swift,Objective-C and Swift
● After installing an app extension, a user must take action to
enable it
App Extension’s Life Cycle
● App extension isn’t an app
● Bundle is different for app and extension
How an App Extension Communicates ● An app extension communicates
primarily with its host app.● There is a request from the host and
a response from the extension.
● There is no direct communication between an app extension and its containing app.
● The containing app isn’t even running while a contained extension is running.
● An app extension’s containing app and the host app don’t communicate at all.
Some APIs Are Unavailable to App
Extensions
● Access a sharedApplication object, and so
cannot use any of the methods on that object.
● HealthKit framework and EventKit UI
framework are unavailable to app extensions.
● Access the camera or microphone on an iOS
device.
● Perform long-running background tasks.
● Receive data using AirDrop.
Creating an App Extension● To add a new target to your Xcode app project, choose File >
New > Target.
Distribute the Containing App
● You can’t submit an app extension to the App Store unless it’s inside a containing app, and you can’t transfer an extension from one app to another.
● To deliver an iOS app extension, you must submit a containing app to the App Store.
● To pass app review, your containing app must provide functionality to users; it can’t just contain app extensions.
Sharing Data with Your Containing App
// Create and share access to an NSUserDefaults object.
NSUserDefaults *mySharedDefaults = [[NSUserDefaults alloc]initWithSuiteName:@"com.example.domain.MyShareExtension"];
// Use the shared user defaults object to update the user's account.
[mySharedDefaults setObject:theAccountName forKey:@"lastAccountName"];
debug an app extension
● Enable the app extension’s scheme by choosing Product > Scheme > MyExtensionName or by clicking the scheme pop-up menu in the Xcode toolbar and choosing MyExtensionName.
● Click the Build and Run button to tell Xcode to launch your specified host app.
● The Debug navigator indicates it is waiting for you to invoke the app extension.
● Invoke the app extension by way of the host app’s UI.
App Extension Types Today
● Extensions in the Today view are called widgets.
● Widgets give users quick access to information that’s important right now .
● Ensure that content always looks up to date.
Custom Keyboard
Photo Editing● Photo Editing extension lets
users edit a photo or video within the Photos app.
Share● Share extensions give
users a convenient way to share content with other entities, such as social sharing websites or upload services.
Action● Create your own custom
action buttons● An Action extension helps
users view or transform content originating in a host app.
● Example:such as viewing an image in a different format or reading text in a different language
Document picker● files can store and retrieve
files stored.
● the document provider act as a local repository for a particular type of document, letting the user gather all those documents into one place.
Thank you
