This document provides an overview of iOS and mobile app development for Apple devices. It describes the core OS and services layers that make up iOS, including frameworks for graphics, media, cocoa touch, and core services. It also discusses the iOS application architecture and lifecycle, common UI elements, and tools for iOS development like Xcode. The document outlines many iOS concepts and terminologies to introduce developers to building apps for Apple mobile devices.

1. iOS – let’s start
Basic introduction to mobile app development
And
Apple iOS
Harit Kothari
@harit

2. Mobile / Cellphone
 Screen
 Memory + Storage + Processor
 Battery
 Always on

3. Operating System
 What is operating system
 Processes, memory, space, time, challenges
 Similarity between mobile and
workstation/computer OS
 Challenges with mobile OS
 J2ME (Java 2 platform Micro Edition)
 Tablet is thin line between mobile and
desktop/workstation

4. Apple iOS
 No iOS v/s Android please!
 Operating system with touch and gesture support
 Memory and diskspace management
 Too many restrictions – security
 Derived from Macintosh OS X
 Initially for iPhone, later on iPod & iPad
 User interaction – few buttons & touch – gestures
 APIs, APIs and lots of APIs wrapped in frameworks

5. High level architecture

6. Core OS Layer
 Just understand, occasionally required, used by frameworks
 Accelerate Framework (digital signal processing, linear algebra,
image-processing calculations)
 Core Bluetooth Framework (Bluetooth)
 External Accessory Framework (Square Card Reader)
 Generic Security Services Framework
 Local Authentication Framework (TouchID)
 Network Extension Framework (VPN)
 Security Framework (Cryptography & Keychain)
 System
Currently 64 bit OS

7. Core Services Layer
 Peer-to-Peer Services (Bluetooth connectivity)
 iCloud Storage
 Block Objects (programming - blocks)
 Data Protection (encryption & restricting access to shared data)
 File-Sharing Support (/Documents directory accessible)
 Grand Central Dispatch
 In-App Purchase
 SQLite
 XML Support
 Frameworks - provides APIs to operate iCloud, CoreData,
AddressBook, Location, Media, HomeKit etc

8. Media Layer
 Graphics & Image
 Animation
 OpenGL ES – 2D & 3D rendering
 Metal – advanced level graphic rendering & manipulation
 Text
 Photo Library
 Audio
 Video
 Frameworks provide APIs to operate on images, photos,
animation, audio-video playback & capture etc.

9. Cocoa Touch Layer
 App Extensions (share, action, widget, photo editing, document sharing)
 Handoff
 AirDrop
 Multitasking
 Auto Layout
 Storyboards
 UI State Preservation
 Apple Push Notification Service
 Local Notifications
 Gesture Recognizers
 Standard System View Controllers (compose email, message, create/edit contact,
etc)
 Frameworks - AddressBookUI, EventKitUI, MapKit, MessageUI, UIKit

10. Where’s application
 Few apps shipped with iDevices like Contacts,
Maps, App Store, Camera, Calendar, Photos
and others
 App Store is an app – marketplace to purchase
and install apps
 And your own!
 .app is compiled application, .ipa is archieved
and code signed app

11. But how to?
 Development needs
 Mac OS X system – iMac, MacBook, Mac Mini –
any
 Softwares – xCode!
 iDevice – good to have – testing
 Of course, knowledge of iOS development,
objective-c, swift languages

12. Terminologies
 Many terminologies, covering few
 IBOutlet
 IBAction
 Classe
 Function
 Delegate
 Block
 Notification
 ViewController

13. UI
 Again, many ready made components available, covering few
 Button
 Label
 Navigation
 View
 ImageView
 ScrollView
 Slider
 Switch
 ActionSheet
 Alert
 No ComboBox/DropDown, Radio Buttons, CheckBoxes – its Apple world
 Your own custom UI component with your own behavior

14. How to put the controls
 Storyboard / XIB
 View Transition / Segue
 Connect them with code

15. Application Lifecycle
Main(), UIApplicationMain, AppDelegate

16. Events
 Touch
 Remote – shake, motion
 Accelerometer, Magnetometer, Gyroscope
 Location
 Redraw

17. Application state
 Execution states of an app
 Not running
 Inactive
 Active
 Background
 Suspended

18. Apple World
 Mac OS X application development
 iWatch
 tvOS – apple TV
 Swift – open source

19. Other side...
 Very rapid development & frequent changes
 New trends and technologies – innovations
 Compatibility & updates

20. Resources & help
 iOS Developer Library -
https://developer.apple.com/library/ios/documentation/
 Ray Wenderlich Tutorials
 Envato tut+ Tutorials
 Stackoverflow best buddy
 GitHub & cocoacontrols – custom components & libraries
 https://developer.apple.com/
 WWDC Sessions
Thank you!