iOS – let’s start

Basic introduction to mobile app developmentAnd

Apple iOS

Harit Kothari

@harit

Mobile / Cellphone

Screen

Memory + Storage + Processor

Battery

Always on

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

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

High level architecture

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

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

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.

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

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

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

Terminologies

Many terminologies, covering few

IBOutlet

IBAction

Classe

Function

Delegate

Block

Notification

ViewController

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

How to put the controls

Storyboard / XIB

View Transition / Segue

Connect them with code

Application Lifecycle

Main(), UIApplicationMain, AppDelegate

Events

Touch

Remote – shake, motion

Accelerometer, Magnetometer, Gyroscope

Location

Redraw

Application state

Execution states of an app

Not running

Inactive

Active

Background

Suspended

Apple World

Mac OS X application development

iWatch

tvOS – apple TV

Swift – open source

Other side...

Very rapid development & frequent changes

New trends and technologies – innovations

Compatibility & updates

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!