Hdc09 I Phone Dev Connecting To Web

iPhone Development Connecting to the cloud

Ninth Division real legit growing apple platforms development company in omaha, ne www.ninthdivision.com @ninthdivision Andy Peters @andypeters

Midwest Mobile Developers connecting all the mobile developers in the region (Nebraska, Iowa, Kansas, Missouri) http://groups.google.com/group/midwest-mobile-developers

Getting started with iPhone Development

ﬂickr: kmulcahy

iPhone The Cloud

Why? ﬂickr: Waldo#4

30 Million iPhone’s Sold as of Sept. 2009

20 Million iPod Touches Sold as of Sept. 2009

User experience.

Ofﬂine usage.

Unreliable Connectivity.

Social networks.

More devices...

iPhone users use the hell out of social apps

15,604,157 Monthly Active Users Facebook for the iPhone

Tweetie 2 for the iPhone

Be unique. ﬂickr: Erica Marshall

Game’s submitting scores to community.

Post high score to twitter.

Announce new user proﬁle on Facebook.

Music related app uses Last.fm for data.

Grab data to populate a map.

Some devices are tied directly to the cloud.

MORE and MORE!

Connection Methods. ﬂickr: barjack

Web Services ~= The Cloud

XML RESTful please!

XML There is no SOAP Client #642 or XML-RPC Client #1,203. You parse it yourself.

Options for Parsing XML • libxml2 • Tree-based: easy to parse, tree in memory • Event-driven: less memory, more complex managing state • Text reader: fast, easy to write • NSXMLParser • Event-driven: simpler but less powerful than libXML • No NSXMLDocument on iPhone • expat too!!!

XML Code NSXMLParser *parser = [[NSXMLParser alloc]initWithData:....];

XML [delegate] Code

XML Docs. • “Event Driven XML Programming in Cocoa” - ADC • NSXMLParser.h / Supporting doc. • NSXMLParserDelegate.h / Supporting doc. • Sample code: XMLPerformance and SeismicXML • Google: cocoa + nsxmlparser

JSON JavaScript Object Notation

JavaScript Object Notation • More lightweight than XML • Similar to a Property List • arrays, dictionaries, strings, numbers • Open Source json-framework wrapper for Objective-C • no “ofﬁcial” Apple library (yet)

JavaScript Object Notation • If I have a choice, I prefer using JSON • Lightweight • Fast • Easy to parse and map to objects.

JSON Looks like { “name” : “Hearful Andrena”, “pets” : 23, “poop-scooping-service” : false, “pet-names” : [“Hanna”, “Nemo”} }

Parsing JSON #import <JSON/JSON.h> // Get a JSON string NSString *jsonString = ....; // Parsing will result in Foundation objects id object = [jsonString JSONValue];

Using JSON-framework // Create data. NSDictionary *dictionary = ...; // converts into a JSON spring. jsonString = [dictionary JSONRepresentation];

UIWebView

Best Practices

Asynchronous Never parse on the main thread.

NSOperation

Never assume you know the size of the server response.

Delegates methods

Show progress.

Debugging.

Caching

Libraries, Frameworks and Wrappers ﬂickr: (Erik)

MGTwitterEngine

ObjectiveFlickr

Facebook Connect

iPhone on Rails

ASIHTTPRequest

Development Demos ﬂickr: TheNixer

Questions ? ﬂickr: Jim in Times Square

ninth Division real legit growing apple platforms development company in omaha, ne www.ninthdivision.com @ninthdivision

Hdc09 I Phone Dev Connecting To Web

by Andy Peters on Oct 18, 2009

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