DataController.m

#pragma mark Data file management stuff

- (void)createEditableCopyOfDatabaseIfNeeded {
    // First, test for existence.
    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    
	NSString *writableDBPath = [[GBAppDelegate documentsDirectory] stringByAppendingPathComponent:@"/database.sqlite3"];
    success = [fileManager fileExistsAtPath:writableDBPath];
    
	if (success) return;
    // The writable database does not exist, so copy the default to the appropriate location.
    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"/database.sqlite3"];
    success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
    if (!success) {
        NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
    }
}

GBAppDelegate.h

//
//  Santa_s_ListAppDelegate.h
//  Santa's List
//
//  Created by David Demaree on 11/6/08.
//  Copyright Practical 2008. All rights reserved.
//

#import <UIKit/UIKit.h>

@class DataController;

@interface GBAppDelegate : NSObject <UIApplicationDelegate> {
	NSUserDefaults *_defaults;
    UIWindow *window;
    UINavigationController *navigationController;
	DataController *dataController;
}

@property (nonatomic, retain) NSUserDefaults *defaults;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@property (nonatomic, retain) DataController *dataController;

+ (NSString*)documentsDirectory;

- (void)askAboutTheCode;

@end

GBAppDelegate.m

//
//  Santa_s_ListAppDelegate.m
//  Santa's List
//
//  Created by David Demaree on 11/6/08.
//  Copyright Practical 2008. All rights reserved.
//

#import "GBShared.h"
#import "RootViewController.h"
#import "SecretCodeView.h"

@implementation GBAppDelegate

@synthesize window;
@synthesize navigationController;
@synthesize dataController;
@synthesize defaults=_defaults;

+ (NSString*)documentsDirectory {
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	return [paths objectAtIndex:0];
}

- (void)applicationDidFinishLaunching:(UIApplication *)application {
	
	[navigationController setNavigationBarHidden:NO];
	
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	self.defaults = defaults;
	[defaults release];
	
	DataController *dataCon = [[DataController alloc] init];
	self.dataController = dataCon;
	[dataCon release];
	
	// Configure and show the window
	[window addSubview:[navigationController view]];
	[window makeKeyAndVisible];	
}

- (void)askAboutTheCode {
	// Have we asked about the secret code yet?
	BOOL shouldResetSecretCode   = [self.defaults boolForKey:@"resetSecretCode"];
	BOOL hasAskedAboutSecretCode = [self.defaults boolForKey:@"hasAskedAboutSecretCode"];
	NSString *secretCode = [self.defaults stringForKey:@"secretCode"];
	
	if(shouldResetSecretCode) {
		[self.defaults setBool:NO forKey:@"hasAskedAboutSecretCode"];
		[self.defaults setBool:NO forKey:@"resetSecretCode"];
		[self.defaults setObject:NULL forKey:@"secretCode"];
	}
	
	if(hasAskedAboutSecretCode && (secretCode == nil)){
		NSLog(@"Has asked and code is blank, allow into the app %@", secretCode);
	}
	else {
		NSLog(@"No, would you please ask about the secret code?");
		SecretCodeView *scv = [[SecretCodeView alloc] initWithNibName:@"SecretCode" bundle:nil];
		[navigationController presentModalViewController:scv animated:NO];
	}
}

- (void)applicationWillTerminate:(UIApplication *)application {
	NSLog(@"Application WILL terminate");
	// Save data if appropriate
	[dataController.peeps makeObjectsPerformSelector:@selector(dehydrate)];
	[self.defaults synchronize];
}

- (void)applicationDidBecomeActive:(UIApplication*)app {
	NSLog(@"App did become active");
	[self askAboutTheCode];
}

- (void)dealloc {
	[dataController release];
	[navigationController release];
	[window release];
	[super dealloc];
}

@end