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iosxcodeuiscrollviewcontentoffset

Navigation- & Toolbar not hidden when UIScrollView scrolls

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    lastOffset = scrollView.contentOffset;

    if (scrollView.contentOffset.y < lastOffset.y) {
        [self.navigationController setNavigationBarHidden:YES animated:YES];
        [self.navigationController setToolbarHidden:YES animated:YES];
    }
    else {
        [self.navigationController setNavigationBarHidden:NO animated:YES];
        [self.navigationController setToolbarHidden:NO animated:YES];
    }
}

What am I doing wrong? The UIScrollViewDelegate is already set in my header file.

Solution

  • You should move

    lastOffset = scrollView.contentOffset;

    to the end of the method, otherwise

    scrollView.contentOffset.y < lastOffset.y

    will never be true.