I have a UITextView *textView in cocos2d's CCLayer. The text is scrolling in both the horizontal and vertical directions. But, I need it to scroll and bounce only in vertically. How to stop the horizontal scrolling programmatically ?

   UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(100,200, windowSize.height/2,windowSize.width/2)];
  textView.backgroundColor = [UIColor clearColor];
textView.text = @"I am First enemy I am First enemy I am First enemy I am First  enemy I am First enemy I am First enemy I am First enemy I am First enemy";
[textView setEditable:NO]; 
textView.font = [UIFont fontWithName:@"Helvetica" size:24.0f];
CGPoint location = CGPointMake(200, 160);
textView.showsHorizontalScrollIndicator = NO;
   //textView.bounces = NO;
//textView.alwaysBounceVertical = YES;

    textView.center = location;
    textView.transform = CGAffineTransformMakeRotation(CC_DEGREES_TO_RADIANS( 90.0f ));  

What should I do stop scrolling horizontally ? Thank You.