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

Really dam easy to do so why refers complex code. just try it. Working

Take a view on imageview exactly size of image view. by default alpha for view set 0.

//MARK: Scroll View Delegate methods
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

NSLog(@"X: %f Y: %f",scrollView.contentOffset.x,scrollView.contentOffset.y);

CGFloat scrollY = _mainScrollView.contentOffset.y;
CGFloat height = _alphaView.frame.size.height;

CGFloat alphaMonitor = scrollY/height;

_alphaView.alpha = alphaMonitor;
}