Use this type of hierarchy as below
UIViewController | ->UIScrollView (uncheck opaque in xib) and set background color to clear color
and set the background of the UIViewController
Happy Coding :)
EDIT
Change the line
self.view=scrollView;
with the line
[self.view addSubView:scrollView];
EDIT


Now add the IBOutlate for the scrollView like this .h file
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;
and in .m file
@synthesize scrollView;
and in xib Control-Drag from file's Owner to the scrollView to assign the IBOutlate to it
this will looks like this

Now