This document discusses iOS app extensions. It defines app extensions as functionality that extends beyond an app but is not an app itself. It runs separately from the app in an isolated address space. The document outlines different types of app extensions like today extensions, share extensions, action extensions, photo editing extensions, custom keyboards, and document providers. It also explains how app extensions work, their life cycle, and how they communicate with the host app. The document provides examples and references for further reading on app extensions.

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iOS Extensions
By
Muhammad Nabeel Arif
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Agenda
• What are apps
• What are app Extensions
• Types
• How app Extensions work
• Demo
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What Are
Apps?
• Most important
experience
• Own entire screen
• Installed/removed by
user
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App Extensions
• Introduced in iOS 8.0 and OS X v10.10
(Yosemite)
• Is not an app
• Extends functionality beyond your app
• App Extensions Increase Your Impact
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Built Separately
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Run Separately
Different Processes
• Isolated address space
• Executes independently
• System optimizes
separately
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Shared
Container
App Group
Shared storage area General
data sharing Coordinate file
access
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Types of App
Extensions
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Today
Extension
• Notification Center Widgets
• Display quick updates from
your app
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Share
Extension
Share contents with others
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Action
Extension
• Small Utilities
• Manipulate or view content
originating in a host app.
• 1Password:
https://blog.agilebits.com/2
014/09/03/1password-app-
extension-developers/
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Photo Editing
Extensions
• Extends photo editing
capacity by providing new
filters and image
manipulations.
• Best photo extension apps
for iPhone :
http://bit.ly/1SB2dMC
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Custom
Keyboard
Allows to write your own
keyboard with whatever
layout and designed you
want.
Animated GIF keyboard :
http://popkey.co/
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Document
Provider
• Access documents from
one app within another
• File management interface
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How app Extensions
Work
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App Extension’s Life Cycle
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How App Extensions Communicate
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How App Extensions Communicate
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Frameworks
Sharing code between your app and it’s extensions

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Demo
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References
• App Extensions : http://apple.co/1I84RX6
• App Extension Programming Guide : http://apple.co/1LsOHq4
• WWDC 2014 : http://apple.co/1kExe35
• Creating Extensions for iOS and OS X, Part -1
• Creating Extensions for iOS and OS X, Part -2
• Raywenderlich : http://www.raywenderlich.com/store/ios-8-by-tutorials
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