问UIScrollView之上的UIScrollView

EN

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

StopwatchViewController *svc = [[StopwatchViewController alloc]init];
[self addChildViewController:svc];
[self.scrollView addSubview:svc.view];
[svc didMoveToParentViewController:self];

BarsViewController *bvc = [[BarsViewController alloc] init];
CGRect frame = bvc.view.frame;
frame.origin.x = 320;
bvc.view.frame = frame;

[self addChildViewController:bvc];
[self.scrollView addSubview:bvc.view];
[bvc didMoveToParentViewController:self];

TimerViewController *tvc = [[TimerViewController alloc]init];
frame = tvc.view.frame;
frame.origin.x = 320 * 2;
frame.origin.y = 44;
tvc.view.frame = frame;

[self.scrollView.panGestureRecognizer requireGestureRecognizerToFail:tvc.pan];
[self addChildViewController:tvc];
[self.scrollView addSubview:tvc.view];
[tvc didMoveToParentViewController:self];

self.scrollView.contentSize = CGSizeMake(320*3, self.view.frame.size.height);
self.scrollView.pagingEnabled = YES;

self.scrollView.contentOffset = CGPointMake(320,0);

[self.scrollView setShowsHorizontalScrollIndicator:NO];

// THIS IS WHERE IT GOES WRONG

if ([[ UIScreen mainScreen ] bounds ].size.height == 568 ) {
    NSArray *images = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"Guide Page One.png"], [UIImage imageNamed:@"Guide Page One.png"], [UIImage imageNamed:@"Guide Page One.png"], nil];
    self.helpScrollView.contentSize = CGSizeMake(280 * 3, 528);
    self.helpScrollView.pagingEnabled = YES;

CGFloat xPos = 0.0;

for (UIImage *image in images) {
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    imageView.frame = CGRectMake(xPos, 0.0, 280, 528);
    [self.scrollView addSubview:imageView];
    xPos += 280;
    // assuming ARC, otherwise release imageView
}

self.helpScrollView.contentOffset = CGPointMake(340,20);
}
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(showHelp)
                                             name:@"showWelcomeMessage"
                                           object:nil];
}