Update UIScroller Offset - ios

Question

Hi I am able to see my UIScrollView offset the first time but I would like it to be constantly updating and checking the offset as the user scrolls from left to right.
Here is what I have.
My UIScrollView
int PageCount = 2;
NSMutableArray *myArray =[[NSMutableArray alloc]initWithObjects:#"12-4.png", #"13-4.png", nil];
scroller = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
scroller.scrollEnabled = YES;
scroller.backgroundColor = [UIColor clearColor];
scroller.pagingEnabled = YES;
[self.view addSubview:scroller];
width = scroller.frame.size.width;
xPos = 0;
for (int i = 0; i < PageCount; i++)
{
ImgView = [[UIImageView alloc]initWithFrame:CGRectMake(xPos, 0, scroller.frame.size.width, scroller.frame.size.height)];
[ImgView setImage:[UIImage imageNamed:[myArray objectAtIndex:i]]];
[scroller addSubview:ImgView];
scroller.contentSize = CGSizeMake(width, 0);
width += scroller.frame.size.width;
xPos += scroller.frame.size.width;
}
And then the offset
if (scroller.contentOffset.x >= 0 && scroller.contentOffset.x <= 320)
{
NSLog(#"Offset %f", scroller.contentOffset.x);
}
And that returns 0.I would like to constantly update and check the offset.
I have tried [scroller needsDisplay] and [scroller needsLayout]
Any help would be really appreciated.Thank you.

Answer 1

You need to learn the basics of C:
if (scroller.contentOffset.x >= 0 && scroller.contentOffset.x <= 320)
This assumes you want to see if the x offset is between 0 and 320 (inclusive).
To check the offset as the scroll view is scrolled, implement the scrollViewDidScroll: delegate method:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView.contentOffset.x >= 0 && scrollView.contentOffset.x <= 320) {
NSLog(#"Offset %f", scroller.contentOffset.x);
} else if (...) {
}
}
And of course you need to see the scroll view's delegate property.