iphone - Dynamically initialise view controllers in iOS -

this question relates dynamically initializing different view controllers based on runtime options. basically, when app starts up, web service sends piece of xml/json down define user preferences etc.

we need determine view controller shown user next, based on these variables. have class asks questions (which features turned on/off etc), , need able return class or initialize class based on this. since not want import every view controller header in each view controller, how initialize class using method such as:

 [[self nextclassmanager] getnextclass]; 

thanks

i use similar open view controller server command, according controller class name:

- (void)openviewcontroller:(nsstring *)thecontrollerclassname {     class thecontrollerclass = nsclassfromstring(thecontrollerclassname);     if (thecontrollerclass && [thecontrollerclass issubclassofclass:[uiviewcontroller class]]) {         uiviewcontroller* controller = [[thecontrollerclass performselector:@selector(alloc)] init];          uinavigationcontroller *nav = (uinavigationcontroller *)self.tabbarcontroller.selectedviewcontroller;         [nav pushviewcontroller:controller animated:yes];         [controller release];     } }