This presentation contains the information regarding the App Extensions which is new feature available from iOS 8

1. iOS 8 App Extensions
by
Ravi Kumar
Sr.iOS Developer
email:jrk.iosdev@gmail.com

2. ● 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

3. 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

4. App Extension’s Life Cycle
● App extension isn’t
an app
● Bundle is different
for app and
extension

5. 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.

6. 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.

7. Creating an App Extension
● To add a new target to your Xcode app project, choose File > New > Target.

8. 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.

9. Sharing Data with Your Containing App

10. // 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"];

11. 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.

12. 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.

13. Custom Keyboard

14. Photo Editing
● Photo Editing extension lets users
edit a photo or video within the
Photos app.

15. Share
● Share extensions give
users a convenient way
to share content with
other entities, such as
social sharing websites
or upload services.

16. 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

17. 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.

18. Thank you