public static void AdjustHeaderPosition(UIScrollView scrollView, nfloat headerHeight, bool animation)
{
var scrollViewOffset = scrollView.ActualContentOffset();
if (scrollViewOffset < 0 || scrollView.Decelerating)
{
return;
}
if (scrollViewOffset < headerHeight / 2)
{
scrollView.SetActualContentOffset(0, animation);
}
else if (scrollViewOffset < headerHeight)
{
scrollView.SetActualContentOffset(headerHeight, animation);
}
}