A. Source Code

Chapter 3—RadarWatcher

AppController.h

#import <Cocoa/Cocoa.h>@class PreferenceController;@interface AppController : NSObject{    PreferenceController *preferenceController;}- (IBAction)showPreferencePanel:(id)sender;@end

AppController.m

#import "AppController.h"#import "PreferenceController.h"@implementation AppController+ (void)initialize{    // Create the user defaults dictionary    NSUserDefaults *defaults;    defaults = [NSUserDefaults standardUserDefaults];    if ([defaults integerForKey:pkeyInitialized] == 0) {        // Save our defaults if not already initialized        [defaults setObject:[NSNumber numberWithInt:1] forKey:pkeyInitialized];        [defaults setObject:[NSNumber numberWithInt:NSOnState]            forKey:pkeyOpenNewWindow]; ...

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