How to solve the error "Redundant conformance of viewController to protocol UIScrollViewDelegate in swift?

I am new on stackOverflow and learning swift. I am getting the error "Redundant conformance of viewController to protocol while working with Stretch headers.UIScrollViewDelegate. I am specifying my code below. please correct any one .

class ViewController: UITableViewController , UIScrollViewDelegate {
    private let kTableHeaderHeight : CGFloat = 300.0
    // Using Implicitly Unwrapped Optional, UIView!
    var headerView:UIView!

    let items = [
    NewsItem(category: .World, summary: "Climate Change protests, Need to preserve our Ecosysytem"),
    NewsItem(category: .India, summary: "Climate Change protests, Need to preserve our Ecosysytem"),
    NewsItem(category: .America, summary: "Climate Change protests,Need to preserve our Ecosysytem"),
    NewsItem(category: .Japan, summary: "Climate Change protests, Need to preserve our Ecosysytem"),
    NewsItem(category: .China, summary: "Climate Change protests, Need to preserve our Ecosysytem"),
    NewsItem(category: .Nepal, summary: "Climate Change protests, Need to preserve our Ecosysytem")]
    override func viewDidLoad() {
        super.viewDidLoad()
        headerView = tableView.tableHeaderView
        tableView.tableHeaderView = nil
        tableView.addSubview(headerView)
   tableView.contentInset = UIEdgeInsetsMake(kTableHeaderHeight, 0, 0, 0)
        tableView.contentOffset = CGPointMake(0, -kTableHeaderHeight)
        updateHeaderView()
    }
    func updateHeaderView(){
        var HeaderRect = CGRectMake(0,-kTableHeaderHeight, tableView.bounds.width, kTableHeaderHeight)

        if tableView.contentOffset.y < -kTableHeaderHeight{
            HeaderRect.origin.y = tableView.contentOffset.y
            HeaderRect.size.height = -tableView.contentOffset.y
        }
        headerView.frame = HeaderRect
    }
    override func didReceiveMemoryWarning() {enter code here
        super.didReceiveMemoryWarning()   
    }
    override func scrollViewDidScroll(scrollView: UIScrollView) {
        updateHeaderView()
    }
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return items.count
    }
    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let item = items[indexPath.row]
let cell = tableView.dequeueReusableCellWithIdentifier("Cell" forIndexPath: indexPath) as! NewsItemTableViewCell
        cell.newsItem = item
 return cell          
    }