I'm developing an Iphone app that has to support different languages.
I saw that the language has to be set within my app and not within iphone settings. So, do I have to force the language instead to take the current one? I didn't find examples over the internet. All examples need the current language of the application. I would like that the user choose his language when the application starts, then I will set a cookie and (in a way that iI don't know) the app refers automatically to my .lproj folders with different languages.
This is not possible using the default localization mechanisms in iOS. By default, the system chooses the .lproj folder according to the user's system language and does the localization automatically if you have localized NIBs and use NSLocalizedString() etc..
If you really want to change that behavior and "override" the system language, you have to implement your own version of NSLocalizedString that manually accesses the strings file in the .lproj folder you want. Be aware though that NIBs don't use your custom NSLocalizedString function. So either don't use NIBs at all or do the localizing of the NIBs in code instead of using different NIBs.