Parallax scrolling effect on UITableView header view when a tableView is scrolled

Create a ParallaxHeaderView using either of one API's

• (id)parallaxHeaderViewWithImage:(UIImage *)image forSize:(CGSize)headerSize
• (id)parallaxHeaderViewWithCGSize:(CGSize)headerSize

set the parallaxHeaderView to UITableViewHeader as shown below

override scrollViewDelegate method

• (void)scrollViewDidScroll:(UIScrollView *)scrollView

Pass the UITableView or UIScrollView scrolling contentOffset to ParallaxHeaderView as shown below.

"thats it"

let headerView: ParallaxHeaderView = ParallaxHeaderView.parallaxHeaderViewWithImage(UIImage(named: "YourImageName"), forSize: CGSizeMake(self.tableview.frame.size.height, 300)) as ParallaxHeaderView
self.tableview.tableHeaderView = headerView

func  scrollViewDidScroll(scrollView: UIScrollView) {
    let header: ParallaxHeaderView = self.tableview.tableHeaderView as ParallaxHeaderView
    header.layoutHeaderViewForScrollViewOffset(scrollView.contentOffset)

    self.tableview.tableHeaderView = header
}

Used UIImage+ImageEffects (Extentions) of Created by Aaron Pang, achiving Bluring effect to headerView, support from iOS 7.0 onwords