iPhone UIScrollView / setContentOffset weirdness
- by bibac
Hi,
I have a weird issue with setContentOffset which I don't seem to be able to solve:
I'm trying to build an "endless" scroll view, so I'd like to reset the content offset at a certain position.
With the code below setContentOffset will be called at x=160px.
If I drag the scroll view my log looks like this:
offset: 158
offset: 159
offset: 160
offset: 80
offset: 160
What happens is that my setContentOffset (to 80) is performed, when I keep on dragging
UIScrollView seem to have forgotten about it and continues at 160.
Even weirder: When I set animated:YES it works. Maybe a timing issue?
When I call setContentOffset from within scrollViewDidScroll, scrollViewDidScroll will be called again.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
NSInteger tileNo = floor(scrollView.contentOffset.x / 80);
NSLog(@"offset: %f, tile: %d, lastTile: %d", scrollView.contentOffset.x, tileNo, lastTileNo);
if (tileNo > lastTileNo) {
[scrollView setContentOffset:CGPointMake(80, 0) animated:NO];
}
lastTileNo = tileNo;
}
Thanks for helping me out,
Stephan
