uiscrollview with strechy and parallax top view
Copy StrechyParallaxScrollView.h/m files to your project.
pod 'StrechyParallaxScrollView', '~> 0.1'//create the top view
UIView *topView = [UIView new];
...
//create scroll view with top view just created
StrechyParallaxScrollView *strechy = [[StrechyParallaxScrollView alloc] initWithFrame:self.view.frame andTopView:topView];
//add it to your controllers view
[self.view addSubview:strechy];
CGFloat parallaxWeight: parallax speed of top view
BOOL strechs: enable/disable streching behaviour (enabled default)
BOOL parallax: enable/disable parallax behaviour (enabled default)