How to hide/show a uiview when uiscrollview Y position changes?

Question

I have a uiview in my app. I want to show the uiview when uiscrollview Y position changes. I tried some stackoverflow suggestion but can't get the expected result. Here's my code that i tried:

if (topScrollView.contentOffset.y) >= 30{
   slideInSearchView.isHidden = false
} else {
   slideInSearchView.isHidden = true
}

Answer 1

Make sure code is inside scrollViewDidScroll

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    if (topScrollView.contentOffset.y) >= 30{
        slideInSearchView.isHidden = false
    } else {
        slideInSearchView.isHidden = true
    }
}