Intro to iPhone development

an introduction
to iPhone
development

Tobias Torrissen
Know IT Objectnet

Agenda
• About the iPhone

• The problem: About the example application

• About the development environment

• Objective C

• Common API-s

• XML parsing API

• Core Location

• 3GS
• Wi-Fi (802.11b/g)
• Bluetooth
• Accelorometer
• 600 MHz
• GPU
• 256 MB DRAM
• A-GPS

• Idea: let´s create an app
that helps you ﬁnd your
way home.
• [screencast]

• Where am I?
• What´s the address?
• What is the route home?
• When is the buss supposed
to arrive
• When does the buss actually
arrive?

reverse geocoding

positioning

route info

reverse geocoding

positioning

route info

realtime info

• Core Location
• Orientation
• Acceleration
• Core Animation
• 3D Open GL ES
• 2D Quarts
• Audio playback
• Video playback
• Touch events
• Integrated Webview
• Contacts
• Images
• Camera
• etc.

• Small extention to ANSI C

• About ten new reserved words

• Syntactical changes inﬂuenced by SmallTalk

• Used primarily by Apple.

• OpenStep standard

• Dynamic typing

• “Explicit” memory management

Deﬁning interfaces
@interface ClassName : SuperClassName
{
int count;
int data;
NSString* aString;
}

@property(nonatomic, retain) NSString* aString;

- (ClassName*) initWithSome: (NSString*) value;
- (void) myObjectMethod:(NSString*)paramName;
+ (void) myClassMethod:(NSString*)paramName;
- (void) placeDocumentInQueue:(NSString) document
before:(int) document after:(int) document;

Deﬁning classes
#import "ClassName.h"

@implementation SomeClass

@synthesize aString;

- (ClassName*) initWithSome:(NSString) value{
self = [super init];
if (self) {
[self setvalue: vale];
}
}

- (void) myObjectMethod:(NSString*)paramName {
// do stuff
}
+ (void) myClassMethod:(NSString*)paramName{
// do stuff
}
- (void) placeDocument:(NSString) document InQueue:(int) queueId
Before:(int) documentId after:(int) documentId {
// do even more!
}

Tricky stuff
Delegates
When you call a API class, you often send a reference to your self or some
other class which will recieve callbacks on certain events

Parameters
Almost named parameters, but the order is signiﬁcant.

Memory allocation.
retain - instance counter++

release - instance counter --

[NSAutoreleasePool] - Inserted objects gets released
automaticlu

A walkthrough of the
example application

• Where am I?
• What´s the address?
• What is the route home?
• When does the buss actually
arrive?

• Create a project in xCode, create GUI

• Write some code and connect the GUI to it

• Use core location

• Get some XML and parse the result

•Create project
•Add some controls
•Run in simulator
[screencast]

•Connect the controls and
the code
•Write a simple message in
the text ﬁeld

•Connect the controls and
the code
•Write a simple message in
the text ﬁeld
[screencast]

•Wiﬁ-hotspots

•Base stations

•Wiﬁ-hotspots

•Base stations

•A-GPS

Core Location

Basestasjoner

CLLocation
Wiﬁ-hotspots
Manager

A-GPS

Core Location

Basestasjoner

Objective-C CLLocation
Wiﬁ-hotspots
Class Manager

A-GPS

Core Location

Basestasjoner

Register the class

Wiﬁ-hotspots
Class Manager

A-GPS

Core Location

Basestasjoner

Register the class

Start positioning

Wiﬁ-hotspots
Class Manager

A-GPS

Core Location

Basestasjoner

Register the class

Start positioning

Objective-C New position found CLLocation
Wiﬁ-hotspots
Class Manager

A-GPS

Core Location

Basestasjoner

Register the class

Start positioning

Wiﬁ-hotspots
Class New position found Manager

A-GPS

Core Location

Basestasjoner

Register the class

Start positioning

Wiﬁ-hotspots
New position found

A-GPS

Core Location

Basestasjoner

Register the class

Start positioning

Wiﬁ-hotspots
New position found

Stop positioning

A-GPS

@interface LocationController : NSObject <CLLocationManagerDelegate> {
CLLocationManager *locationManager;
id delegate;
}

@property (nonatomic, retain) CLLocationManager *locationManager;
@property (nonatomic, assign) id delegate;

- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation;

didFailWithError:(NSError *)error;

@end

@implementation LocationController

@synthesize locationManager, delegate;

// Constructor.
- (id) init {
self = [super init];
if (self != nil) {
self.locationManager = [[[CLLocationManager alloc] init] autorelease];
self.locationManager.delegate = self; // send loc updates to myself
}
return self;
}

// Called when the locationmanager finds a new update on posission
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
[self.delegate locationUpdate:newLocation];
}

// Called if an error occurs.
didFailWithError:(NSError *)error
{
[self.delegate locationError:error];
}

// free the memory
- (void)dealloc {
[self.locationManager release];
[super dealloc];
}
@end

[..]

locationController = [[LocationController alloc]init];
locationController.delegate = self;

[..]

[locationController.locationManager startUpdatingLocation];

[..]

- (void)locationUpdate:(CLLocation *)location {
myTextField.text = [location description];
[locationController.locationManager stopUpdatingLocation];
}

- (void)locationError:(NSError *)error {
myTextField.text = [error description];
}

XML parsing
Event based XML parsing:
- (void)parser:(NSXMLParser *)parser didStartElement:
(NSString *)elementName

- (void)parser:(NSXMLParser *)parser foundCharacters:
(NSString *)string

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString
*)elementName

- (void)parserDidEndDocument:(NSXMLParser *)parser

<DISMessages SubscriptionID="1">

<DISDeviation TimeStamp="2009-04-27T13:17:10.201+02:00">
<DISID>Stortinget</DISID>
<LineID>3</LineID>
<DestinationStop>Mortensrud</DestinationStop>
<ScheduledDISArrivalTime>2009-04-27T13:40:30.000+02:00<ScheduledDISArrivalTime>
<ExpectedDISArrivalTime>2009-04-27T13:40:55.000+02:00</ExpectedDISArrivalTime>
</DISDeviation>

<DISDeviation TimeStamp="2009-04-27T13:17:10.201+02:00">
<DISID>Stortinget</DISID>
<LineID>4</LineID>
<DestinationStop>Bergkrystallen</DestinationStop>
<ScheduledDISArrivalTime>2009-04-27T13:42:30.000+02:00</ScheduledDISArrivalTime>
<ExpectedDISArrivalTime>2009-04-27T13:45:55.000+02:00</ExpectedDISArrivalTime>
</DISDeviation>

</DISMessages>

//
// ArrivalInfo.h
// rOOts2
//
// Created by Tobias K Torrissen on 4/27/09.
// Copyright 2009 __MyCompanyName__. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface ArrivalInfo : NSObject {
NSString *DestinationStop;
NSString *ExpectedDISArrivalTime;
NSString *ScheduledDISArrivalTime;
NSString *LineID;
}

@property(nonatomic, retain) NSString *ExpectedDISArrivalTime;
@property(nonatomic, retain) NSString *ScheduledDISArrivalTime;
@property(nonatomic, retain) NSString *LineID;
@property(nonatomic, retain) NSString *DestinationStop;
@end

//
// ArrivalInfo.m
// rOOts2
//
// Created by Tobias K Torrissen on 4/27/09.
// Copyright 2009 __MyCompanyName__. All rights reserved.
//

#import "ArrivalInfo.h"

@implementation ArrivalInfo

@synthesize DestinationStop, ExpectedDISArrivalTime,
ScheduledDISArrivalTime, LineID;

- (void) dealloc {

[DestinationStop release];
[ExpectedDISArrivalTime release];
[ScheduledDISArrivalTime release];
[LineID release];
[super dealloc];
}

@end

#import <Foundation/Foundation.h>
#import "ArrivalInfo.h"
#import "ROOts2AppDelegate.h"

@interface RealTimeParser : NSObject {

ArrivalInfo *currentArrivalInfo;
NSMutableString *valueInProgress;
rOOts2AppDelegate *delegate;
}

- (RealTimeParser *) initRealTimeParser;
@end

// called whenever an start element is reached.
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {

if([elementName isEqual:@"DISMessage"]){
NSLog(@"start dataset");
currentArrivalInfo = [[ArrivalInfo alloc]init];

}
}
// save the actual value...
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {

if(!valueInProgress)
valueInProgress = [[NSMutableString alloc] initWithString:string];
else
[valueInProgress appendString:string];
}

// when ever you reach a end document tag.
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {

if([elementName isEqualToString:@"DISDeviation"]) {
NSLog(@"Adding travel info to deligate");
[delegate.records addObject:currentArrivalInfo];
[currentArrivalInfo release];
currentArrivalInfo = nil;
} else if ([elementName isNotEqualTo:@"DISMessages"]) {
[currentArrivalInfo setValue:valueInProgress forKey:elementName];
NSLog(@"Adding key, value %@, %@ n", elementName, valueInProgress);
}
[valueInProgress release];
valueInProgress = nil;
}

NSURL *url = [[NSURL alloc] initWithString:@"http://
www.sis.trafikanten.no:8088/xmlrtpi/dis/request?DISID=SN
$03011330"];

NSXMLParser *xmlParser = [[NSXMLParser alloc]
initWithContentsOfURL:url];

RealTimeParser *parser = [[RealTimeParser alloc]
initRealTimeParser];

[xmlParser setDelegate:parser];

BOOL success = [xmlParser parse];
if(success)
NSLog(@"No Errors");
else
NSLog(@"Error Error Error!!!");

How to get
into iPhone
development

• You need to
register...
• Apple ID

• You need to
register...
• Apple ID

• iPhone Developer

• You need to
register...
• Apple ID


Program

• Personal
• 99$

• can distribute through appstore

• Personal
• 99$

• can distribute through appstore

• Enterprise
• 299$

• can not distribute through appstore

• well...

?
• The phone is
amazing.

• well...

?
• The phone is
amazing.

• Xcode is OK

• well...

?
• The phone is
amazing.

• Xcode is OK

• The politics are
mindboggeling

• well...

?
• The phone is
amazing.

• Xcode is OK

• The politics are
mindboggeling

• Look out for
Android

News in iPhone 3.0
• peer-to-peer connections over Bonjour;

• an app interface for hardware accessories;

• access to the iPod music library;

• a new Maps API

• long-awaited push notiﬁcation support.
• API for streaming audio and video directly over
HTTP

• control of the proximity sensor

• audio recording features

• a battery API

NSMutableURLRequest *theRequest = [[NSMutableURLRequest alloc] init];
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];

[theRequest setURL:[NSURL URLWithString:@"http://service-test.1881.no/SearchService/v4_2/SearchService.asmx"]];

[theRequest setHTTPMethod:@"POST"];
[theRequest setValue: msgLength forHTTPHeaderField:@"Content-Length"];
[theRequest setValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[theRequest setValue: @"http://Opplysningen.WebService.SearchService/2006/10/MultiSearchSingleResult"
forHTTPHeaderField:@"SOAPAction"];
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

if(connection) {
webData = [[NSMutableData data] retain];
} else {
NSLog(@"ERROR with connection");
}
[theRequest release];
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[webData setLength:0];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
{
[webData appendData: data];
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"ERROR with the connection");
[spinner stopAnimating];
[connection release];
[webData release];
[query release];
}

-(void)connectionDidFinishLoading:(NSURLConnection *) connection
{
NSLog(@"DONE loading. Recieved BYTES: %d", [webData length]);

NSString *soapMessage = [NSString stringWithFormat:
@"<?xml version="1.0" encoding="utf-8"?>n"
"<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/
XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">n"
"<soap:Body>n"
"<MultiSearchSingleResult xmlns="http://Opplysningen.WebService.SearchService/2006/10">n"
"<MultiSearchRequest>n"
"<GetAdvertisements>false</GetAdvertisements>n"
"<ResponseType>None</ResponseType>n"
"<PageSize>20</PageSize>n"
"<Offset>0</Offset>n"
"<SearchQuery>%@</SearchQuery>n"
"<PartnerGuid>20ecc3d7-8057-4512-8aab-e3bf55470333</PartnerGuid>n"
"<MultiSearchFilter>n"
"<GetPersonSearch xmlns="http://Opplysningen.WebService.SearchService.DataTypes/2006/10">true</
GetPersonSearch>n"
"<GetAddressSearch xmlns="http://Opplysningen.WebService.SearchService.DataTypes/2006/10">true</
GetAddressSearch>n"
"<GetCompanySearch xmlns="http://Opplysningen.WebService.SearchService.DataTypes/2006/10">true</
GetCompanySearch>n"
"<GetBusinessSearch xmlns="http://Opplysningen.WebService.SearchService.DataTypes/2006/10">true</
GetBusinessSearch>n"
"</MultiSearchFilter>n"
"<DetailLevel>Basic</DetailLevel>n"
"<RequireMapCoordinates>false</RequireMapCoordinates>n"
"</MultiSearchRequest>n"
"</MultiSearchSingleResult>n"
"</soap:Body>n"
"</soap:Envelope>n", query];

Intro to iPhone development

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Editor's Notes