Argthtjtr

I have been trying for a while to create a UIViewController that has a CustomStickyHeader and a UITableView. The idea I have been following is use the UITableView scrolling for changing the header view with the value of the contentOffset.

The layout for the ViewController (AlbumsViewController) looks like:

The UItableView Scrolling functions from the delegate are implemented like that:

func scrollViewDidScroll(_ scrollView: UIScrollView) {



    let endReached = contentTableView.contentOffset.y >= (contentTableView.contentSize.height - contentTableView.frame.size.height)

    let isUP = lastContentOffset > scrollView.contentOffset.y



    if scrollView.contentOffset.y < 0 {



        headerHeightConstraint.constant += abs(scrollView.contentOffset.y)



    }

    else{



        if !endReached{



            if isUP{ // -> Finger moving Down ...

                let newSize = headerHeightConstraint.constant + abs(scrollView.contentOffset.y/75)

                headerHeightConstraint.constant = newSize

            }

            else{

                let newSize = headerHeightConstraint.constant - abs(scrollView.contentOffset.y/75)

                headerHeightConstraint.constant = newSize

            }



            if headerHeightConstraint.constant < headerView.minHeaderSize {

                headerHeightConstraint.constant = headerView.minHeaderSize

            }



        }

        else{



            if headerHeightConstraint.constant > headerView.minHeaderSize {



            }



        }



    }

    //HeaderView Function for changing the alpha of a view

    headerView.changeColorAlpha(headerHeight: headerHeightConstraint.constant)

    lastContentOffset = scrollView.contentOffset.y



}



func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {



    if self.headerHeightConstraint.constant > headerView.maxHeaderSize {

        animateHeader()

    }

    else if scrollView.contentOffset.y == 0{

        animateHeader()

    }



}



func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {



    if self.headerHeightConstraint.constant > headerView.maxHeaderSize {

        animateHeader()

    }

    else if scrollView.contentOffset.y == 0{

        animateHeader()

    }



}



private func animateHeader() {



    self.headerHeightConstraint.constant = headerView.maxHeaderSize

    UIView.animate(withDuration: 0.4, delay: 0.0, usingSpringWithDamping: 0.7, initialSpringVelocity: 0.5, options: [.curveEaseInOut], animations: {



        self.headerView.changeColorAlpha(headerHeight: self.headerHeightConstraint.constant)

        self.view.layoutIfNeeded()



    }, completion: nil)



}

So far it works if i scroll gently and the result looks like that:

and fully "Collapsed" with the minimum height:

However, If i scroll fast, the scrollView gets to the end and, I suppose, scrollViewDidScroll is not called and the headerView's height gets partially "collapsed" like that:

What am I doing wrong?
Is there a better approach?

Thank you