ios – header disappears by lowering its top when scrolled up

I would love If you scroll, it doesn’t transfer downwards by lowering the peak on collectionview.

I need it in my utility, similar to in YouTube’s iOS utility, the place the header disappears by lowering its top when scrolled up.you possibly can see on video too
video:

https://youtu.be/Raz69tHhKdI

I wrote code like this

extension TemplatesViewController{
    func showTagsPlaceHolder() {
        DispatchQueue.essential.async { [self] in
            
            tagsPlaceHolderViewHeightAnchor.isActive = false
            tagsPlaceHolderViewHeightAnchor.fixed = 120
            tagsPlaceHolderViewHeightAnchor.isActive = true
            //tagsPlaceholder.isHidden = false
          
            
            self.view.setNeedsLayout()
            UIView.animate(withDuration: 0.5) {
                tagsPlaceholder.alpha = 1
                self.view.layoutIfNeeded()
            }
            
        }
      
        
    }
    func hideTagsPlaceHolder() {
        DispatchQueue.essential.async {[self] in
            
            tagsPlaceHolderViewHeightAnchor.isActive = false
            tagsPlaceHolderViewHeightAnchor.fixed = 0
            tagsPlaceHolderViewHeightAnchor.isActive = true
            
            self.view.setNeedsLayout()
            UIView.animate(withDuration: 0.5) {
                tagsPlaceholder.alpha = 0
                self.view.layoutIfNeeded()
            }
            
        }
       
    }
    
   
    
    
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        
        let yOffset = scrollView.contentOffset.y
        let maxOffsetY = scrollView.contentSize.top - scrollView.body.measurement.top;
        
        //refresh the desk view however disable the bounce
        if yOffset < 0.0 || yOffset > maxOffsetY{
            return
         }
     
         if (self.lastContentOffset > yOffset) {
              // transfer up
              print("transfer up")
              showTagsPlaceHolder()
              //tagsPlaceHolderIsHidden = true
              
          }
          else if (self.lastContentOffset < yOffset) {
              // transfer down
              print("transfer down")
              hideTagsPlaceHolder()
              //tagsPlaceHolderIsHidden = false
             
          }
          self.lastContentOffset = yOffset
        
       }
    
}

The one downside is that while you scroll up, the peak steadily decreases, or while you scroll down, the peak steadily will increase. It ought to be easy like YouTube