iOS iCode iTennis App Problem

[Fuzzball27]

Hi all,
I just recently got the iOS SDK with Xcode 4, and I'm working on getting familiar with building apps. As the title of my thread indicates I'm having a problem with the iCode blog's app tutorial, iTennis. The problem that I'm having is that when I run the app, the "Tap to start" label doesn't disappear, and the ball doesn't move...the user raquette works. I will post the entire program at the end of my thread. All help is greatly appreciated
Here is the specific area of gameState coding where I suspect the problem(s) to be:

- (void)viewDidLoad {
    [super viewDidLoad];
    self.gameState = kGameStatePaused;
    BallVelocity = CGPointMake(kBallSpeedX, kBallSpeedY);
    [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(gameLoop) userInfo:nil repeats:YES];
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    if(gameState == kGameStatePaused) {
        tapToBegin.hidden = YES;
        gameState = kGameStateRunning;
    } else if (gameState == kGameStateRunning) {
        [self touchesMoved:touches withEvent:event];
    }
}

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];
    CGPoint xLocation = CGPointMake(location.x, Raquet_Yellow.center.y);
    Raquet_Yellow.center = xLocation;
}

Here is the ViewController.h file

#import <UIKit/UIKit.h>

@interface iTennisViewController : UIViewController {
    IBOutlet UIImageView *Ball;
    IBOutlet UIImageView *Raquet_Green;
    IBOutlet UIImageView *Raquet_Yellow;
    IBOutlet UILabel *tapToBegin;
    
    IBOutlet UILabel *player_score;
    IBOutlet UILabel *computer_score;
    
    CGPoint BallVelocity;
    NSInteger gameState;
}

@property(nonatomic,retain) IBOutlet UIImageView *Ball;
@property(nonatomic,retain) IBOutlet UIImageView *Raquet_Green;
@property(nonatomic,retain) IBOutlet UIImageView *Raquet_Yellow;
@property(nonatomic,retain) IBOutlet UILabel *tapToBegin;
@property(nonatomic,retain) IBOutlet UILabel *player_score;
@property(nonatomic,retain) IBOutlet UILabel *computer_score;
@property(nonatomic) IBOutlet CGPoint BallVelocity;
@property(nonatomic) IBOutlet NSInteger gameState;
@end

Here is the ViewController.m file

 #import "iTennisViewController.h"

#define kGameStateRunning 1
#define kGameStatePaused 2

#define kCompMoveSpeed 15

#define kBallSpeedX 10
#define kBallSpeedY 15

@implementation iTennisViewController
@synthesize Ball,Raquet_Yellow,Raquet_Green,player_score,computer_score,gameState,BallVelocity,tapToBegin;

- (void)viewDidLoad {
    [super viewDidLoad];
    self.gameState = kGameStatePaused;
    BallVelocity = CGPointMake(kBallSpeedX, kBallSpeedY);
    [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(gameLoop) userInfo:nil repeats:YES];
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    if(gameState == kGameStatePaused) {
        tapToBegin.hidden = YES;
        gameState = kGameStateRunning;
    } else if (gameState == kGameStateRunning) {
        [self touchesMoved:touches withEvent:event];
    }
}

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];
    CGPoint xLocation = CGPointMake(location.x, Raquet_Yellow.center.y);
    Raquet_Yellow.center = xLocation;
}

-(void) gameLoop {
    if (gameState == kGameStateRunning) {
        if (CGRectIntersectsRect(Ball.frame, Raquet_Yellow.frame)) {
            if(Ball.center.y < Raquet_Yellow.center.y) {
                BallVelocity.y = -BallVelocity.y;
            }
        }
        if (CGRectIntersectsRect(Ball.frame, Raquet_Green.frame)) {
            if(Ball.center.y > Raquet_Green.center.y) {
                BallVelocity.y = -BallVelocity.y;
            }
        }
        else {
            if(tapToBegin.hidden) {
                tapToBegin.hidden = NO;
            }
        }
        if (Ball.center.y <= self.view.center.y) {
            if (Ball.center.x < Raquet_Green.center.x) {
                CGPoint compLocation = CGPointMake(Raquet_Green.center.x -kCompMoveSpeed, Raquet_Green  .center.y);
                Raquet_Green.center = compLocation;
            }
            if (Ball.center.x > Raquet_Green.center.x) {
                CGPoint compLocation = CGPointMake(Raquet_Green.center.x +kCompMoveSpeed, Raquet_Green.center.y);
                Raquet_Green.center = compLocation;
            }
        }  
    }
}

-(void) dealloc {
    [super dealloc];
    [Ball release];
    [Raquet_Green release];
    [Raquet_Yellow release];
    [player_score release];
    [computer_score release];
    [tapToBegin release];
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
}
*/

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end