iOS App DevelopmentLecture 1 - Introduction

Thursday 26 July 12

Acknowledgements

• Slides based on the iOS App Development course at UMBC (http://cs491f10.wordpress.com/)andCS 193P at Stanford University (http://www.stanford.edu/class/cs193p/cgi-bin/drupal/)

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Course Description• This course provides a study of the design,

development and publication of object-oriented applications for iOS platforms (e.g. iPhone, iPod touch & iPad) using the Apple SDK. Students will learn to utilise Objective-C and the various SDK frameworks to build iPhone & iPod touch applications under Mac OS X.

• Prerequisites: RW 214 and RW 344

• Recommended: Competency in C or C++ (pointers, memory management, etc.)

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Course Objectives

• Gain an understanding of the Objective-C language

• Become familiar with the Apple development tools

• Understand and apply design patterns in order to build mobile applications

• Understand and utilise hardware emerging in today’s mobile devices

• Be able to utilise core frameworks of iOS

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Evaluation

• Homework: 20%

• Project: 30%

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Homework

1. Create “Your first iOS application” & demo to me: 2.5%

2. Write ImageProcessing Application: 17.5%

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Project

• Theme: Mobile for African problems

• Functional specification (What): 5%

• Compare to existing products (Why)

• Task list with milestones and deadlines, mockup: 5%

• Final project and demo: 20%

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Grading Criteria

• Correctness of App

• Appearance of App

• Adherence to Objective-C and iOS coding conventions

• Neatly formatted and indented code

• Well documented header files

• Absence of significant performance issues

• Absence of memory leaks

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iOS Developer University Program

• Apple has a free iOS University program that provides more benefits than the free registration, including:

• Free on-device development

• Developer forum access

• We will be participating in this program this semester, so if you have an iPhone, iPod touch or iPad, you’ll be able to install and run your apps on-device

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When / Where did it all start?

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iOS Architecture

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OS X Architecture

Picture from Wikipedia

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Core OSOSX KernelMach 3.0BSDSocketsSecurity

Power ManagementKeychain AccessCertificatesFile SystemBonjour

iOSCocoa Touch

Media

Core Services

Core OS

StanfordCS193p

Fall 2010

Core OSCore OS

OS X KernelPower Management

Mach 3.0Keychain Access

BSD Certificates

Sockets File System

Security Bonjour

Thursday 26 July 12

Core OSOSX KernelMach 3.0BSDSocketsSecurity

Power ManagementKeychain AccessCertificatesFile SystemBonjour

iOSCocoa Touch

Media

Core Services

Core OS

StanfordCS193p

Fall 2010

Core ServicesCore Services

Collections Core Location

Address Book Net Services

Networking Threading

File Access Preferences

SQLite URL Utilities

Thursday 26 July 12

Core OSOSX KernelMach 3.0BSDSocketsSecurity

Power ManagementKeychain AccessCertificatesFile SystemBonjour

iOSCocoa Touch

Media

Core Services

Core OS

StanfordCS193p

Fall 2010

MediaMedia

Core AudioJPEG, PNG, TIFF

OpenAL PDF

Audio Mixing Quartz (2D)

Audio Recording

Core Animation

Video Playback

OpenGL ES

Thursday 26 July 12

Core OSOSX KernelMach 3.0BSDSocketsSecurity

Power ManagementKeychain AccessCertificatesFile SystemBonjour

iOSCocoa Touch

Media

Core Services

Core OS

StanfordCS193p

Fall 2010

Cocoa TouchCocoa Touch

Multi-Touch Alerts

Core Motion Web View

View Hierarchy

Map Kit

Localisation Image Picker

Controls Camera

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Model View Controller

Controller

View Model

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A different view

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Development Stack — Tools

Text

Images from AppleThursday 26 July 12

Development Stack — FrameworksDevelopment Stack — Frameworks

Foundation

UI Kit

Map KitAddress Book

Core Animation

Core Data

OpenGL

Many Others...

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Development Stack — Language & RuntimeDevelopment Stack — Language & Runtime

Objective-C

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Hello World in Objective-C & Xcode

Thursday 26 July 12

Hello World

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

// insert code here... NSLog(@"Hello, World!");! [pool drain]; return 0;}

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Import Statement

• Exactly like a #include in C/C++, however it ensures that the header is only ever included once

• Foundation/Foundation.h includes many core functions, constants, and objects

#import <Foundation/Foundation.h>

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main

• Exactly like a main section in C or C++

• argc contains the number of command line arguments

• argv is an array of char pointers (C strings)

• main returns a value indicating success or failure

• By convention zero is success, non-zero is failure

int main (int argc, const char * argv[]) { .... return 0;}

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Pools

• These lines allocate an NSAutoreleasePool that is used for memory management

•We’ll cover memory management in some detail in the coming classes, but for now we’ll just be sure to include this code and put our program between these 2 statements

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];...[pool drain];

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NSLog and @“strings”

• NSLog is a function that’s used for printing a string to the console (with some other logging information)

• Note the goofy @ symbol out in front of the double quoted string

• The @ symbol is used to distinguish the string as an Objective-C string (as opposed to a C string)

• NSLog behaves much like C’s printf function in that it can take formatters using % notation and variable number of arguments

NSLog(@"Hello, World!");

Thursday 26 July 12