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[cDima]

So.... for the sake of patterns, show me how to do this app correctly with MVC.

This code scared me away:

TwoViewAppAppDelegate *mainDelegate = (TwoViewAppAppDelegate *)[[UIApplication sharedApplication] delegate];

Lets do this via ViewControllers.

The MainView should have the controller TwoViewAppViewController.
The TwoViewAppViewController should have 2 methods: sayHi, flipView?

#import 

@interface TwoViewAppViewController : UIViewController {
	IBOutlet UILabel *theLabel;
}

@property (nonatomic, retain) UILabel *theLabel;

-(void) sayHi: (id) sender;
-(void) flipView: (id) sender;

@end

Inside flipView:sender we call the delegate, which is TwoViewAppAppDelegate? How do we reach the TwoViewAppAppDelegate?
I'm confused.