ios – Develop/Collapse UITableView all the time will get the unsuitable top

As this video, (you possibly can obtain supply code from right here, I’ve tried my greatest to take away all of the pointless code)

I have to manually scroll by way of tableview to make it reset to the appropriate top of every cell and if I develop and unexpand a number of cells, it’ll present the unsuitable top once more.

I am making an attempt to make use of “systemLayoutSizeFittingSize” as a substitute of “heightForRowAt”. (CustomCell.swift)

override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {

    setNeedsLayout()
    layoutIfNeeded()
    
    let defaultHeight: CGFloat = 90
    return CGSize(width: 0, top: !isExpanded ? defaultHeight : tableView.contentSize.top + defaultHeight)
}

I wish to use autolayout as a substitute of giving the precise top for tableview. what do I do unsuitable?