WS-Blog » Objective-C http://www.websector.de/blog // Flex, AIR, Flash Wed, 16 Jun 2010 09:25:14 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Simple RSS reader for iPhone using PureMVC Standard for Objective-C http://www.websector.de/blog/2009/02/08/simple-rss-reader-for-iphone-using-puremvc-standard-for-objective-c/ http://www.websector.de/blog/2009/02/08/simple-rss-reader-for-iphone-using-puremvc-standard-for-objective-c/#comments Sun, 08 Feb 2009 11:24:29 +0000 sectore http://www.websector.de/blog/?p=210 Few weeks ago Cliff Hall announced the release of PureMVC Objective-C Port by Brian Knorr. Brian also provided a very helpful demo called “Employee Admin“.

To dive into the Objective-C port of PureMVC as quick as possible I have built a another demo. It’s a pretty simple RSS reader for iPhone or iPod touch, which grabs a feed of a blog and shows the latest 10 entries in detail.

Screen shots

Screen shots of an iPhone RSS reader using PureMVC

View and download full source

View or grab the source here:
http://github.com/sectore/puremvc-objectivec-simplerssreader/

It’s open source licensed under the Mozilla Public License 1.1.

Conclusion

Brian Knorr, the project owner of the Objective-C port of PureMVC, did an awesome job! But the question is: Do I need a MVC framework such as PureMVC for developing an iPhone app? You don’t! Because Objective-C based already on a MVC paradigma.

However, if you are new to Objective-C and you may have a strong ActionScript background using PureMVC, it might be a good choice to dive into iPhone development. And you will see, that the code architecture is like your home ;)

-Jens

]]> http://www.websector.de/blog/2009/02/08/simple-rss-reader-for-iphone-using-puremvc-standard-for-objective-c/feed/ 2 Free iPhone app for Flex User Group Hamburg (incl. source code) http://www.websector.de/blog/2009/01/27/free-iphone-app-for-flex-user-group-hamburg-incl-source-code/ http://www.websector.de/blog/2009/01/27/free-iphone-app-for-flex-user-group-hamburg-incl-source-code/#comments Tue, 27 Jan 2009 17:40:50 +0000 sectore http://www.websector.de/blog/?p=150 [UPDATE 02/11/09] flexughh app is available on iTunes store! All links has been updated. Get it for free ;)

It’s done! My first iPhone app is uploaded to Apple’s app store. It’s an app for the Flex UG in Hamburg / Germany, called “flexughh”. Because I’m very excited about all the enthusiastic flexughh-members I decided to offer this app for free including its full source code written in Objective-C as open source!

Today I will present the new flexughh app at our flexughh-Meeting. If you don’t have the chance to attend it, here are some screen shots.

Screen shots

 

Get flexughh app for free!

The flexughh app is be available in German and in English!

flexughh on iTunes Store

Source code

The flexughh app is written in Objective-C. You can see and download the full source here (within the next days):
http://github.com/sectore/flexughh-iphone/

Have fun!

-Jens

]]> http://www.websector.de/blog/2009/01/27/free-iphone-app-for-flex-user-group-hamburg-incl-source-code/feed/ 3 Quick tip (Objective-C): Formatting an RFC2822 date of an RSS feed using NSDateFormatter http://www.websector.de/blog/2009/01/25/quick-tip-objective-c-formatting-an-rfc2822-date-of-an-rss-feed-using-nsdateformatter/ http://www.websector.de/blog/2009/01/25/quick-tip-objective-c-formatting-an-rfc2822-date-of-an-rss-feed-using-nsdateformatter/#comments Sun, 25 Jan 2009 17:30:03 +0000 sectore http://www.websector.de/blog/?p=123 Parsing an RFC2822 date of an RSS feed and formatting it using NSDateFormatter (e.g. “Tue, 16 Dec 2008 11:45:13 +0000” to “16. December 2008“) is not easy as it seems. Fortunately there are already some helpfull tips and articles out there, such as fiam’s solution described at “Parsing RFC2822 dates with NSDate“, Anatoliy Kolesnick’s article called “Parse Date from RSS to NSDate” or the helpful article “Advanced Strings In Cocoa” posted at CocoaCast.

All these solutions work great for me using the iPhone Simulator. But if you test your code on a real device (iPhone or iPod touch), you may run in an issue.

In my situation, all dates were not formatted well on my device, there are nil. It took me about 5 hours (I’m not kidding ;) ) to figure out, that the NSDateFormatter uses the current locale of a device for formatting dates.

On my device the locale is “German (Germany)” no matter if I change the settings to English or to any other language (Settings -> General -> International). As a result a month declared as “Dec” will be failed by NSDateFormatter on an iPhone using a German locale. It should be “Dez”, the shortcut for “Dezember”.

Solution

To format an RFC2822 date well on any foreign device you have to force the locale to “en_US”. ( Note: That’s not necessary for any English or American user ;) )

NSDateFormatterExample ( Download code )

  1. //
  2. // Example of formatting the date string
  3. // "Tue, 16 Dec 2008 11:45:13 +0000"
  4. // to
  5. // "16. December 2008"
  6. //
  7.  
  8. NSString *feedDateString = @"Tue, 16 Dec 2008 11:45:13 +0000";
  9. //
  10. // A formatter to create a date using the RFC2822 date of a RSS feed
  11. NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
  12. // Note: We have to force the locale to "en_US" to avoid unexpected issues formatting data
  13. NSLocale *usLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
  14. [inputFormatter setLocale: usLocale];
  15. [usLocale release];
  16. // set the format based on an RFC2822 date format
  17. [inputFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss Z"];
  18. // create a NSDate object using the NSDateFormatter
  19. NSDate *formattedDate = [inputFormatter dateFromString: feedDateString];
  20. // format the date created before to a format of your choice, such as "16. December 2008"
  21. NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
  22. [outputFormatter setDateFormat:@"d’.’ MMMM yyyy"];
  23.  
  24. NSLog(@"formattedDateString : ‘%@’", [outputFormatter stringFromDate:formattedDate]);
  25.  
  26. [inputFormatter release];
  27. [outputFormatter release];
  28.  

BTW: For checking the locale on your device use the following snippet:

CheckLocaleSnippet ( Download code )

  1. NSLocale *locale = [NSLocale currentLocale];
  2. NSString *localeId = [locale displayNameForKey:NSLocaleIdentifier
  3.                                 value:[locale localeIdentifier]];
  4.  
  5. NSLog(@"localeId: ‘%@’", localeId);

-Jens

]]> http://www.websector.de/blog/2009/01/25/quick-tip-objective-c-formatting-an-rfc2822-date-of-an-rss-feed-using-nsdateformatter/feed/ 5 WSPluginSwitcher: Cocoa based tool for switching Flash plug-in on OS X http://www.websector.de/blog/2009/01/02/wspluginswitcher-cocoa-based-tool-for-switching-flash-plug-in-on-os-x/ http://www.websector.de/blog/2009/01/02/wspluginswitcher-cocoa-based-tool-for-switching-flash-plug-in-on-os-x/#comments Fri, 02 Jan 2009 15:54:12 +0000 sectore http://www.websector.de/blog/?p=104

It’s never to late to learn a new (programming) language ;) So I’ve been starting to learn Cocoa, Apple’s Objective-C based programming environment for Mac OS X.

My “Cocoa”-trip started with building a little application called “WSPluginSwitcher“, which is a Cocoa based tool for switching Flash plug-ins on OS X (Leopard).

Check it out – it’s open source, including its source code: WSPluginSwitcher on Google Code

Screen shots

Download WSPluginSwitcher including full source

You can download WSPluginSwitcher at its Google Code project.

To get the full source checkout the latest code using WSPluginSwitchers repository at Google Code.

It’s open source!

BTW: I’m very new to Cocoa, so I’m very happy about any feedback ;)

Helpful links for learning Cocoa as an ActionScript Developer

About 10 days of programming a new language is not enough to make a real statement… However, what I’ve have learned so far is: To learn Cocoa as quick as possible you will need a good book! Apple delivers tons of Cocoa guides, but it takes me (too) much time to find basic solutions. I know why I love Adobes Flex and AIR docs ;)

So I highly recommend the book called “Cocoa Programming for Max OS X” by Aaron Hillegass, which helps me a lot!

Further helpful links (not only for ActionScript Developers) are:

P.S.: Happy Flash plug-in switching using WSPluginSwitcher! ;)

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