The document provides an introduction to iOS development using Objective-C. It discusses what is needed to get started, including downloading the iOS SDK and Xcode developer tools. It also introduces key concepts like the MVC pattern, delegates, storyboards and ARC memory management. The document walks through creating a basic iOS project in Xcode with a label and two buttons. It demonstrates how to link the interface objects to the view controller files and add touch event handlers to update the label text when each button is pressed.

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Welcome to vibrant
technologies and computers

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What do you need?
•Previous experience in another Object Oriented
Programming (OOP) language will be helpful
•Some understanding of C can be helpful, but is
not required. Objective-C builds on C++.
•Development Environment (IDE) is helpful
•Mac computer running OS X Lion or higher!
•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.

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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. (very similar to C)
•This workshop will teach you how to get started
but will not have time to teach you everything.
•This workshop is good preparation for a real full
iPhone/iPad, iOS Development class!

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What is iOS?
•iOS is an OS. 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 workshop
will focus on iOS SDK 5
•iOS is multitasking and runs on 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. It does NOT run on MS Windows.
•Xcode provides an interface to the compiler, editor,
debugger, and code profiling tools.

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Device Features
•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

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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 be required to becomes a register Apple
iOS developer
•It’s $99 year for the basic account
•If you plan to get a job in iOS development, you
will need to establish a basic account and submit
something to the Apple Store. Maybe a game?

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Let’s get started - Launch
Xcode
• You are presented
with the Welcome
screen:
•Create a new project
•Connect to a repository
•Learn about using
Xcode
•Go to Apple’s Portal
•Go ahead and click on
“Create a new project”

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Project Template
•There are several
predefined
templates to help
you get started
on a new project
•For now, click on
Single View
Application

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Project Options
• The Product Name is the name of
your app
• Company Identifier is your
organization name – such as
edu.itu (reverse domain)
• Class Prefix (leave empty)
• Device Family: iPad, iPhone,
Universal (Universal means that a
single binary will have screens for
iPhone, iPod Touch, and iPads)
• Storyboards
• Automatic Reference Counting
• Include Unit Tests (leave
unchecked as we are not using)

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Source Control
• Asks for a location for Source
Control
• By Default, it will use a local
GIT repository
• New developers not used to
source control – this is
extremely useful!
• It keeps track of versions, lets
you see what’s changed, and
will undoubtedly be used in
any team project you run into
in the “real” world
• GIT and Subversion are two
popular source controls
systems – there are many
others to choose from

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Where do I start?

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Let’s build the default project
•Click the Run button (upper left of the screen)
•The iPad simulator will launch (You can also
change this to iPhone if you want)
•You will have a blank white screen
•Press Command-Q to end the simulator

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Quick Terminology: MVC
•Model-View-Controller (MVC)
•MVC is the paradigm of iOS programming
•Model: Holds 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

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Quick Terminology: Delegate
•AppDelegate.h
•AppDelegate.m
•The Delegate is essentially
the “controller” of your
app. It links buttons, labels
and views together
•.h files are header files and
interfaces are defined here
•.m files are implementation
files. These contain your
classes, code, etc.

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Quick Terminology:
Storyboard
•These are new to iOS5
•Storyboards help you graphically lay out your app
before you code it.
•It makes it easy to see the “flow” of your app
•You are advised to use Storyboards going forward
with you iOS programming adventures
•If you have tinkered with iOS in the past, you might
be asking about the xib/nibs. They are still there,
however, Storyboards offer similar functionality and
make it easier to visualize your views.
•We will not be covering nibs in this workshop.

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Quick Terminology: ARC
•Automatic Reference Counting (ARC)
•The LLVM 3.0 compiler handles memory
management for you
•It is not a garbage collector!
•Prior to iOS5 – memory management was the single
most difficult item to grasp in Objective-C.
•Unless you have specific reasons, all of your projects
should use ARC.

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Quick Terminology: Unit Tests
•We will not be discussing Unit Tests in this
workshop
•Be advised – unit tests are very useful for your
programs
•The tests can help you make sure your code
changes are not breaking anything.
•The goal is to be able to find bugs quicker and fix
them before your code goes to QA (or the
customer!)

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Click on the iPhone Storyboard
•It shows a blank
view
•It looks like you are
on a sheet of graph
paper
•There are two
buttons – below
•First Responder
•View Controller

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Find the Label
•In Xcode, lower right
hand corner, scroll
until you find the
object Label
•Drag Label to the
blank view
•Double click on the
Label you added, and
change it to say “Hello
World”
•Do the same steps for
the iPad Storyboard

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Run the project
•The iPad and iPhone projects should now display
Hello World!

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Next, add two buttons to your
view
•Find the Round Rect
Button, drag two to
the view
•Double-click on one of
the buttons and type
Hello
•Double-click on one of
the buttons and type
Goodbye
•Run your project,
click on the buttons

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Nothing Happens – we have to
tell it to do something
•Click on the
Assistant Editor
•It looks like a
tuxedo
•It will be in the
upper right hand
corner of your
screen

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Linking the ViewObject to your
ViewController…
•You will see your
ViewObject in the
middle of the screen
•The right hand side
of the screen should
be the
ViewController.h file
View Object
ViewController.h

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Link the label…
• Single click on your Hello World
label
• While holding down the Control
key, left click-drag to the
ViewController.h file
• You need to drag between the
@interface and @end in the
code
• This will make a new property
• For the name, call it helloLabel
so we can easily recognize what
it is
• This step will allow us to make
changes to the UILabel

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@interface and @end
•Remember that Objective-C is an
extensive to the C language
•The @ symbol denotes an Objective-C
keyword
•@interface is the start of a class.
•@interface Classname: Superclass
•Anything between the declaration and
end is part of the class

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@property (weak, nonatomic)
IBOutlet UILabel *helloLabel;
•A property is an attribute of the class
•Getters and Setters are automatically created for
you
•Weak is a memory management term
•Nonatomic has to do with adding mutexes around
your getters and setters
•IBOutlet stands for Interface Builder Outlet.
•Interface Builder still exists in iOS5 but we are
using the new Storyboard feature instead.

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@synthesize helloLabel
•Synthesize – this creates the
accessor/mutators (getters/setters)
for you
•You can write your own if you want,
but in general, there is no reason to
do this.

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Link the rest of the buttons
•Link helloButton to
ViewController.h
•Link goodbyeButton
to ViewController.h
•When done, you will
have two properties
•Now, switch the
Assistant window to
the ViewController.m
file

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TouchUpInside Actions
TouchUpInside events occur
if you touch a button and lift
off while inside the button
This corresponds to a user
tapping a button
Right-Click on the Hello
button
On the far right, locate Touch
Up Inside
Left click-drag this over to
your ViewController.m
Notice it creates some code
Do the same for the goodbye
button

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IBAction
•You created two IBActions
•Actions signify something that happens
when you do something for example, push
a button.
•When you push a button, it fires the action
•These are currently empty methods
- (IBAction)helloPushed:(id)sender {
}
- (IBAction)goodbyePushed:(id)sender {
}

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Thank you
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