iPhone Coding For Web Developers

iPhone coding for web developers Matt Biddulph www.hackdiary.com

From websites to mobile apps

www.twitter.com

m.twitter.com

Twitterifc, Tweetie and Twitterfon

www.facebook.com

m.facebook.com

native iPhone app

Joe Hewitt on the native Facebook app

“People must have assumed that all I had to do was plug Facebook's data into Apple's ready-to-use UI components and hit the GO button. Joe Hewitt on the native Facebook app

“I wish it had been that easy, but unfortunately many of the components I needed were missing from the iPhone SDK, even though they existed in Apple's own apps.” Joe Hewitt on the native Facebook app

Phonegap

Building native internet apps

Internet app basics

Internet app basics HTTP JSON or XML Regular Expressions Local storage

HTTP NSURLRequest is ﬁddly. I use GTMHTTPFetcher from Google Toolbox for Mac. http://code.google.com/p/google-toolbox-for-mac/ or TTURLRequest from Joe Hewitt http://joehewitt.com/post/the-three20-project/

XML Mac OS X has NSXMLDocument for DOM parsing. The iPhone only has NSXML for SAX parsing. This is hard.

XML iPhone ships with libxml2. It is good, fast and has a nasty C API. Convenience wrapper functions make it much easier: NSArray *PerformXMLXPathQuery(NSData *document, NSString *query); http://cocoawithlove.com/2008/10/using-libxml2-for-parsing-and-xpath.html

JSON Objective C coders make liberal use of mix-ins. Ruby coders fondly call this ‘monkeypatching’. #import quot;NSString+SBJSON.hquot; [@quot;{quot;1quot;:2}quot; JSONValue]; (returns an NSDictionary)

Regular Expressions Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems. —usually attributed to jwz in comp.lang.emacs

Regular Expressions Again, the iPhone’s string handling has no regular expression builtins. But it ships with the ICU library that does.

Regular Expressions RegexKitLite extends NSString with methods that bridge to ICU. This gives you UTF-safe functions with small memory overhead and caching. http://regexkit.sourceforge.net/RegexKitLite/

Regular Expressions As usual with Objective C, the method names are rather verbose. split: componentsSeparatedByRegex gsub: stringByReplacingOccurrencesOfRegex backrefs: matchEnumeratorWithRegex

Local Storage SQLite is the iPhone’s default database management library. This is a good thing.

Local Storage Yet again, it’s a C library that isn’t integrated with Cocoa.

Local Storage FMDB is an Objective C wrapper modeled on Java’s JDBC. It’s sensible. FMDatabase* db = [FMDatabase databaseWithPath:@quot;...quot;]; [db open]; [db executeUpdate:@”SELECT ...”]; http://code.google.com/p/ﬂycode/source/browse/trunk/fmdb

A few words about event-driven code

The user is in control

UI responsiveness and rendering is a priority

Fallacies of networked computing

Fallacies of networked computing The network is reliable. Latency is zero. Bandwidth is inﬁnite.

The world is asynchronous But threads are hard

Understand delegation

thank you Matt Biddulph www.hackdiary.com Flickr photo heroes: http://www.flickr.com/photos/scobleizer/1215753803/ http://www.flickr.com/photos/envision/3085397880/ http://www.flickr.com/photos/frinky/3236718934/ http://www.flickr.com/photos/nickbilton/2861938380/ http://www.flickr.com/photos/donsolo/2855854548/ http://www.flickr.com/photos/en321/209425860/ http://www.flickr.com/photos/mastrobiggo/2424561037/

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iPhone Coding For Web Developers

by Matt Biddulph on Mar 26, 2009

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iPhone Coding For Web Developers — Presentation Transcript