1… Why is UIScrollView leaving space on top
With Storyboard– Goto view controller > Attribute Inspector > Uncheck Adjust Scroll View Insets property
With Code– For extra space set viewController property automaticallyAdjustsScrollViewInsets to NO, by default it is YES.
self.automaticallyAdjustsScrollViewInsets = false;
scroller.contentInset = UIEdgeInsetsZero;
scroller.scrollIndicatorInsets = UIEdgeInsetsZero;
scroller.contentOffset = CGPointMake(0.0, 0.0);
2… does not scroll to the bottom
To make it scroll try with large number in contentSize like CGSizeMake(320, 1687). If it works that means you are not setting the contentSize large enough to have all its content.