如何以编程方式停止水平滚动？

我在cocos2d的CCLayer中有一个UITextView *textView。文本在水平和垂直方向上滚动。但是，我需要它仅垂直滚动和弹跳。 如何以编程方式停止水平滚动？

   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 ));  

我应该怎么做才能停止水平滚动？

谢谢。

我不知道这是否是一个好的解决方案。但这对我有用。我在这里发帖，以便任何人都可以纠正它。

    textView = [[UITextView alloc] initWithFrame:CGRectMake(100,200,200 ,200)];
    textView.backgroundColor = [UIColor clearColor];
    NSLog(@"description: %@", enemyDescription);
    textView.text = enemyDescription;
    [textView setEditable:NO]; 
    textView.font = [UIFont fontWithName:@"Helvetica" size:14.0f];
    CGPoint location = CGPointMake(200, 160);
    textView.showsHorizontalScrollIndicator = NO;
    textView.alwaysBounceVertical = YES;

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

    [[[CCDirector sharedDirector]openGLView]addSubview:textView];   

这对我有用。它仅上下滚动，也上下弹跳。

谢谢。