Making the AppController @interface

We'll use the Interface Builder application to lay out the window's contents and hook up various connections between AppController and the user interface controls. Interface Builder is also used to lay out iPhone applications, so time in Interface Builder is well spent no matter which platform you'll end up programming for. We'll add stuff to the AppController class, and then Interface Builder will notice our additions and let us build the user interface.

First, we'll set up the header file for AppController:

#import <Cocoa/Cocoa.h>

@interface AppController : NSObject {
  IBOutlet NSTextField *textField;
  IBOutlet NSTextField *resultsField;
}

- (IBAction) uppercase: (id) sender;
- (IBAction) lowercase: (id) sender;

@end // AppController