iOS [XCode Beginner] Program not Showing in Screen

#import <UIKit/UIKit.h>

@interface PictureBookViewController : UIViewController{
    //instance variables
    __strong IBOutlet UIImageView *myPicturePage;
    __strong IBOutlet UIButton *nextButton;
    NSArray *pictureBookImages;
    int currentPage;
    bool notLastPage;
}

//properties
//free up memory for delivering stuff to outlets
@property (retain, nonatomic)UIImageView *myPicturePage;
@property (retain, nonatomic)NSArray *pictureBookImages;
@property (retain, nonatomic)UIButton *nextButton;

//methods
- (IBAction)next:(id)sender;

@end

#import "PictureBookViewController.h"

@interface PictureBookViewController ()

@end

@implementation PictureBookViewController
@synthesize myPicturePage;
@synthesize nextButton;
@synthesize pictureBookImages;

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    notLastPage = TRUE;
    currentPage = 0;
    pictureBookImages = [[NSArray alloc] initWithObjects:
                         [UIImage imageNamed: @"Cat1.png"],
                         [UIImage imageNamed: @"Cat2.png"],
                         [UIImage imageNamed: @"Cat3.png"],
                         nil];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)next:(id)sender {
    currentPage++;
    
    if(notLastPage){
        [nextButton setTitle: @"Next" forState: UIControlStateNormal];
    }
    else{
        [nextButton setTitle: @"Restart" forState: UIControlStateNormal];
    }
    
    if(currentPage >= [pictureBookImages count]){
        currentPage = 0;
    }
    
    [UIImage animatedImageNamed:@"turnpage" duration:1];
    [UIView setAnimationCurve: UIViewAnimationCurveEaseInOut],
    notLastPage = YES;
    if(currentPage == 1){
        [UIView setAnimationTransition: UIViewAnimationTransitionCurlUp forView:(self.view) cache:(YES)],
        notLastPage = NO;
    }
     if(currentPage == 2){
         [UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES],
         [UIView commitAnimations],
         notLastPage = NO;
         myPicturePage.image = [pictureBookImages objectAtIndex:currentPage];
         
     }
}
@end

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    notLastPage = TRUE;
    currentPage = 0;
    pictureBookImages = [[NSArray alloc] initWithObjects:
                         [UIImage imageNamed: @"Cat1.png"],
                         [UIImage imageNamed: @"Cat2.png"],
                         [UIImage imageNamed: @"Cat3.png"],
                         nil];
}

#import "PictureBookAppDelegate.h"

@implementation PictureBookAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    return YES;
}
							
- (void)applicationWillResignActive:(UIApplication *)application
{
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

@end