introduction to ios apps development

PROF. ERWIN M. GLOBIO, MSIT

Introduction to iOS Development

PROF. ERWIN M. GLOBIO, MSIT

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.

PROF. ERWIN M. GLOBIO, MSIT

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.

PROF. ERWIN M. GLOBIO, MSIT

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.

PROF. ERWIN M. GLOBIO, MSIT

PROF. ERWIN M. GLOBIO, MSIT

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

PROF. ERWIN M. GLOBIO, MSIT

Capabilities of Mobile DevicesInternet access• Touch screen• GPS (global positioning system – satellite-based system

todetermine a location)• Local storage• Camera• Media playback• Phone• Bluetooth for device communication

PROF. ERWIN M. GLOBIO, MSIT

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

PROF. ERWIN M. GLOBIO, MSIT

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

PROF. ERWIN M. GLOBIO, MSIT

PROF. ERWIN M. GLOBIO, MSIT

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.

PROF. ERWIN M. GLOBIO, MSIT

PROF. ERWIN M. GLOBIO, MSIT

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.

PROF. ERWIN M. GLOBIO, MSIT

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

PROF. ERWIN M. GLOBIO, MSIT

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.

PROF. ERWIN M. GLOBIO, MSIT

PROF. ERWIN M. GLOBIO, MSIT

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

PROF. ERWIN M. GLOBIO, MSIT

PROF. ERWIN M. GLOBIO, MSIT

PROF. ERWIN M. GLOBIO, MSIT