I recently needed to dynamically create UIViewController objects based on class/nib names defined in a configuration file, then display them in a UINavigationController.

Here’s how it’s done:

 
// Dynamically create new view controller based on class name string, then add it to    
//   my app via [UINavigationController setViewControllers:animated:]      

NSString *myUIViewControllerClassName = @"MyViewController";    
Class myClass = NSClassFromString(myUIViewControllerClassName);  
NSObject *myObject = [myClass new];  
if( [myObject isKindOfClass:[UIViewController class]] )  
{      
  UIViewController *newViewController = (UIViewController *) myObject;      
  [newViewController initWithNibName:myUIViewControllerClassName bundle:nil];  
  [appDelete.navigationController setViewControllers:[NSArray arrayWithObject:newViewController] animated:NO];       
  [newViewController release];  
}  
else   
{      
  [myObject release];  
}