iPhone UIScrollView / setContentOffset weirdness
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by bibac
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Published on 2010-01-30T16:47:37Z
Indexed on
2010/06/03
18:04 UTC
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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
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