iOS Standford course

7/30/2019 iOS Standford course

1/63

Stanford CS193pDeveloping Applications for iOS

Fall 2011


2/63

TodayWhat is this class all about?Description

PrerequisitesHomework / Final Project

iOS OverviewWhats in iOS?

MVCObject-Oriented Design Concept

Objective CNew language!Basic concepts only for today.


3/63

What will I learn in this courHow to build cool appsEasy to build even very complex applications

Result lives in your pocket!Very easy to distribute your application through the AppStoreVibrant development community

Real-life Object-Oriented ProgrammingThe heart of Cocoa Touch is 100% object-orientedApplication of MVC design model

Many computer science concepts applied in a commercial development platform:Databases, Graphics, Multimedia, Multithreading, Animation, Networking, and muNumerous students have gone on to sell products on the AppStore


4/63

PrerequisitesMost Important Prereq!Object-Oriented Programming

CS106A&B required, CS107 recommended

Object-Oriented TermsClass (description/template for an object)Instance (manifestation of a class)Message (sent to object to make it act)Method (code invoked by a Message)

Instance Variable (object-specific storage)Superclass/Subclass (Inheritance)Protocol (non-class-specific methods)

You should know thIf you are not very comforta

these, this might not be the

Programming ExperThis is an upper-level CS cou

If you have never written a had to design and implementhandful of classes, this will

difficulty for you.


5/63

AssignmentsWeekly Homework7 weekly assignments

Assigned Thursday after lectureDue the following Wednesday at 11:59pmIndividual work onlyHomework graded , + and - based on

Required Tasks and Evaluation criteriaLots of extra credit available, bank itOnly 3 free late days per quarter

#1 fail: falling behind on homework

Final Project3 weeks to work on it

But weighted like 4 weeks Proposal requires instructoSome teams of 2 might be Keynote presentation requir


6/63

Core OSOSX Kernel

Mach 3.0

BSD

Sockets

Security

Power Manage

Keychain Acce

Certificates

File System

Bonjour

iOS

Cocoa Touch

Media

Core Services

Core OS


7/63

Core ServicesCollections

Address Book

Networking

File Access

SQLite

Core Locatio

Net Services

Threading

Preferences

URL Utilities

iOS

Cocoa Touch

Media

Core Services

Core OS


8/63

MediaCore Audio

OpenAL

Audio Mixing

Audio Recording

Video Playback

JPEG, PNG

PDF

Quartz (2

Core Anim

OpenGL E

iOS

Cocoa Touch

Media

Core Services

Core OS


9/63

Cocoa TouchMulti-Touch

Core Motion

View Hierarchy

Localization

Controls

Alerts

Web View

Map Kit

Image Pic

Camera

iOS

Cocoa Touch

Media

Core Services

Core OS


10/63

Platform Components

Tools

Language

Frameworks

Design Strategies

[display setTextColor:[UIColor blackColor]]

Foundation UIKit

MVC

CoreData

MapKit

Xcode 4 Instrumen

ts

CoreM
http://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.apphttp://localhost/Developer/Applications/Instruments.app


11/63

Controller

MVC

Model View

Divide objects in your program into 3 camps.


12/63

Controller

MVC

Model View

Model = What your application is (but not how it is d


13/63

Controller

MVC

Model View

Controller = How your Model is presented to the user


14/63

Controller

MVC

Model View

View = Your Controllers minions


15/63

Controller

MVC

Model View

Its all about managing communication between c


16/63

Controller

MVC

Model View

Controllers can always talk directly to their Mo


17/63

Controller

MVC

Model View

outlet

Controllers can also talk directly to their View


18/63

Controller

MVC

Model View

outlet

The Model and View should never speak to each o


19/63

Controller

MVC

Model View

?outlet

Can the View speak to its Controller?


20/63

Controller

MVC

Model View

outlet

Sort of. Communication is blind and structure


21/63

Controller

MVC

Model View

outlet

target

The Controller can drop a target on itself.


22/63

Controller

MVC

Model View

act

outlet

target

Then hand out an action to the View.


23/63

Controller

MVC

Model View

act

outlet

target

The View sends the action when things happen in t


24/63

Controller

MVC

Model View

act

outlet

should

will did

target

Sometimes the View needs to synchronize with the C


25/63

Controller

MVC

Model View

act

delegate

outlet

should

will did

target

The Controller sets itself as the Views delegat


26/63

Controller

MVC

Model View

act

delegate

outlet

should

will did

target

The delegate is set via a protocol (i.e. its blind to


27/63

Controller

MVC

Model View

act

delegate

outlet

should

will did

target

Views do not own the data they display.


28/63

Controller

MVC

Model View

act

delegate

outlet

should

will did

target

countdataat

So, if needed, they have a protocol to acquire


29/63

Controller

MVC

Model View

act

delegate

outlet

data

source

should

will did

target

countdataat

Controllers are almost always that data source (not

MVC


30/63

Controllers interpret/format Model information for t

Controller

MVC

Model View

act

delegate

outlet

data

source

should

will did

target

countdataat

MVC


31/63

Controller

MVC

Model View

act

? delegate

outlet

data

source

should

will did

target

countdataat

Can the Model talk directly to the Controller

MVC


32/63

Controller

MVC

Model View

act

delegate

outlet

data

source

should

will did

target

countdataat

No. The Model is (should be) UI independent

MVC


33/63

Controller

MVC

Model View

act

delegate

outlet

data

source

should

will did

target

countdataat

So what if the Model has information to update or so

MVC


34/63

Controller

MVC

Model View

act

Notification& KVO

delegate

outlet

data

source

should

will did

target

countdataat

It uses a radio station-like broadcast mechani

MVC


35/63

Controller

MVC

Model View

act

Notification& KVO

delegate

outlet

data

source

should

will did

target

countdataat

Controllers (or other Model) tune in to interesting

MVC


36/63

A View might tune in, but probably not to a Models

Controller

MVC

Model View

act

Notification& KVO

delegate

outlet

data

source

should

will did

target

countdataat

MVC


37/63

Controller

MVC

Model View

act

Notification& KVO

delegate

outlet

data

source

should

will did

target

countdataat

Now combine MVC groups to make complicated prog

MVCs working together


38/63

MVCs working together

MVCs not working togethe


39/63

MVCs not working togethe

Objective C


40/63

Objective-CNew language to learn!Strict superset of CAdds syntax for classes, methods, etc.A few things to think differently about (e.g. properties, dynamic binding)

Most important concept to understand today: PropertiUsually we do not access instance variables directly in Objective-C.Instead, we use properties.A property is just the combination of a getter method and a setter method in aThe getter has the name of the property (e.g. myValue)

The setters name is set plus capitalized property name (e.g. setMyValue:)(To make this look nice, we always use a lowercase letter as the first letter of a We just call the setter to store the value we want and the getter to get it. Sim

This is just your first glimpse of this language!Well go much more into the details next week.Dont get too freaked out by the syntax at this point.

Objective C


41/63

Objective-CSpaceship.h

Objective C


42/63


Objective C


43/63


Objective-C


44/63


Objective-C


45/63


Objective-C


46/63


Objective-C


47/63


Objective-C


48/63

Objective CSpaceship.h

Objective-C


49/63


Objective-C


50/63


Objective-CS hi h


51/63


Objective-CS hi h


52/63


Objective-CS hi h


53/63


Objective-CSpaceship h


54/63

O jec ive CSpaceship.h



55/63

jSpaceship.h



56/63

jSpaceship.h



57/63

jSpaceship.h



58/63

jSpaceship.h



59/63

jSpaceship.h



60/63

Spaceship.h



61/63

Spaceship.h



62/63

Spaceship.h

Coming Up


63/63

g pNext LectureOverview of the Integrated Development Environment (IDE, i.e. Xcode 4)Objective-C in action

Concrete example of MVCMajor demonstration of all of the above: RPN Calculator

(HOMEWORK: if you do not know what an RPN Calculator is, look it up on the i

FridayVery simple introduction to using the debugger.Optional. You can figure it out on your own if you want (not too difficult).

Next WeekObjective-C language in depthFoundation classes: arrays, dictionaries, strings, etc.Dynamic vs. static typingProtocols, categories and much, much more!

Documents

iOS Standford course