This document provides an introduction and overview of iOS development. It discusses prerequisites including previous programming experience, recommended resources for learning iOS development like Apple's developer site and books, and an introduction to the core concepts of iOS, Objective-C, and the Xcode integrated development environment. It also covers limitations of the iOS simulator and key tools like Instruments for debugging apps.

1. Introduction to
iOS Development

2. Resources
• http://developer.apple.com/iOS
• iPhone Programming, The Big Nerd Ranch Guide
• Joe Conway & Aaron Hillegass
• Programming in Objective-C
• Kochan
• http://www.raywenderlich.com Excellent iOS5 tutorials!
• Stanford - free iOS lectures. Worth the time to watch!

3. Prerequisites for iOS
Development
• Previous experience in another Object Oriented
Programming(OOP) language will be helpful
• Understanding of OOP concepts.
• Some understanding of C can be helpful, but is not required.
Objective-C builds on top of C. You will eventually run into
pointers and other fundamental “C” features
• Previous experience with an Integrated Development
Environment (IDE) is helpful, but not required
• Mac computer running OS X Lion
• If you plan to submit to the App Store, you will need Apple
devices to do real testing on. The simulator is not good
enough.

4. Introduction
• iOS is the operating system that runs iPhones, iPod
Touches,iPads, and Apple TVs.
• The language used to develop software for iOS is
Objective-C.
• This class will teach you how to get started but will not
havetime to teach you everything.

5. What is iOS?
• iOS is an operating system – it’s a subset of Mac OS X.
• The iOS SDK is the software development kit that allows
application programs to utilize classes and frameworks
provided by the SDK. This class will focus on iOS
SDK6.
• iOS is multitasking and runs on several different
devices(iPhones, iPod Touches, iPads, and Apple TVs).
• Apple provides an IDE called Xcode.
• Xcode is the IDE used by iOS (and OS X) developers.
• Xcode provides an interface to the compiler, editor,
debugger, and code profiling tools.

7. Device Features
• For the rest of the presentation, assume we are discussing
iPhones, iPads, and iPod Touches. Although Apple TV runs
iOS, Apple currently does not allow developers to create
custom code for this device (yet).
• SQLite for structured data storage
• Media support for common audio, video, and still image
formats (MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, GIF)
• GSM Telephony (hardware dependent)
• Bluetooth, EDGE, 3G, and WiFi (hardware dependent)
• Camera, GPS, compass, and accelerometer (hardware
dependent)
• Rich development environment, including a device simulator,
tools for debugging, memory and performance profiling

8. Capabilities of Mobile
Devices
Internet access
• Touch screen
• GPS (global positioning system – satellite-based system
todetermine a location)
• Local storage
• Camera
• Media playback
• Phone
• Bluetooth for device communication

9. Limitation of Mobile Devices
• Screen size
• Touch screen
• No physical keyboard or trackball – a finger or stylus is
the primary interface to the device
• Memory
• Storage
• Battery Life
• Cell network
• Sometimes flaky networks
• Ergonomics

10. Download the iOS SDK
• Download the latest from the Apple App store
• This is only available for Apple Macintosh computers
• It’s free
• To build to device and submit to the app store, you will
berequired to becomes a register Apple iOS developer
• It is $99 year for the basic account

12. The Xcode – Integrated
Development Environment
• This consists of a single-window user interface,
consisting of the Project Window, Jump and Navigation
Bars, and the newly integrated Interface Builder designer.

14. Features of the iPhone
Simulator
• The"iPhone Simulator",
simulates various features of a
real iOS device. Although the
iPhone simulator is just a
simulator to simulate certain
tasks, it does come with some
limitations.

15. Simulator Limitations
• Making Phone calls
• Accessing the Accelerometer/Gyroscope
• Sending and Receiving SMS messages
• Installing applications from the App Store
• Accessibility to the Camera
• Use of the Microphone
• Several Core OpenGL ES Features

16. Instruments
• The Xcode instruments allow you to dynamically trace
and profile the performance of your Mac OSX, iPhone,
and iPad applications. You can also create your own
Instruments using DTrace and the Instruments custom
builder.
• Monitor your applications for memory leaks, which can
cause unexpected results.
• Gain a deeper understanding of the execution behavior of
your applications.

18. Quick Terminology: MVC
• Model-View-Controller (MVC)
• MVC is the paradigm of iOS programming
• Model: Hold data, should know nothing of the interface
• View: code for getting data in/out of a view. Deals with
items like buttons, lists, tables, etc
• Controller: keeps the Model objects and View objects in
sync