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[iPhoneDevelopment]

I have realised that the current code that I am using is causing the blocks to all fall to the bottom of the screen, whereas what I want is for the blocks to pile on top of themselves. I changes the code in the example smasher gave me to try to implement this, but it does not seem to have worked. The code I am currently using is posted below, but when built no blocks are created or animated down the screen.

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

-(void)gameLoop {
	if(gameState == kGameStateRunning) {
		
		UIImage *blockImage = [UIImage imageNamed:@"block.png"];
		
		block= [[UIImageView alloc] initWithImage: blockImage];
		
		int x = arc4random()%320; 
		int y = -100;
		block.center = CGPointMake (x,y);
		
		block.center = CGPointMake(block.center.x + blockVelocity.x, block.center.y + blockVelocity.y);
		
		[self.view addSubview: block];
		[block release];
}}

-(void)blockCollision {
	
	CGPoint newCenter = block.center;
	if (newCenter.y > 420){
		newCenter.y = 420;
		UIImage *blockImage = [UIImage imageNamed:@"block.png"];
		
		block= [[UIImageView alloc] initWithImage: blockImage];
		
		int x = arc4random()%320; 
		int y = -100;
		newCenter = CGPointMake (x,y);
		
		[self.view addSubview: block];
		[block release]; }

	if (CGRectIntersectsRect(block.frame, block.frame)){
		newCenter.y = -10;
		UIImage *blockImage = [UIImage imageNamed:@"block.png"];
		
		block= [[UIImageView alloc] initWithImage: blockImage];
		
		int x = arc4random()%320; 
		int y = -100;
		newCenter = CGPointMake (x,y);
		
		[self.view addSubview: block];
		[block release]; }
	block.center = newCenter;
		
	}

Again, any help would be much appreciated!!

Thanks

Cam