iOS 7 parallax effect in my view controller

Question

I\'m developing an app for iOS 7 in Objective-C. I\'ve got a screen in my app with a few buttons and a pretty background image. (It\'s a simple xib with UIButtons

Answer 1

This will help someone who is looking to implement parallax for tableView or collectionView.

• first of all create the cell for the tableview and put the image view in it.

• set the image height slightly more than the cell height. if cell height = 160 let the image height be 200 (to make the parallax effect and you can change it accordingly)

• put this two variable in your viewController or any class where your tableView delegate is extended

let imageHeight:CGFloat = 150.0
let OffsetSpeed: CGFloat = 25.0

• add the following code in the same class

 func scrollViewDidScroll(scrollView: UIScrollView) {
    //  print("inside scroll")

    if let visibleCells = seriesTabelView.visibleCells as? [SeriesTableViewCell] {
        for parallaxCell in visibleCells {
            var yOffset = ((seriesTabelView.contentOffset.y - parallaxCell.frame.origin.y) / imageHeight) * OffsetSpeedTwo
            parallaxCell.offset(CGPointMake(0.0, yOffset))
        }
    }
}

• where seriesTabelView is my UItableview

• and now lets goto the cell of this tableView and add the following code

func offset(offset: CGPoint) {
        posterImage.frame = CGRectOffset(self.posterImage.bounds, offset.x, offset.y)
    }

• were posterImage is my UIImageView

If you want to implement this to collectionView just change the tableView vairable to your collectionView variable

and thats it. i am not sure if this is the best way. but it works for me. hope it works for you too. and let me know if there is any problem