Changing the bounds origin of the superview does not change the position of the view.
ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog
That is, if you pin a view to the left edge of its superview, you're really pinning it to the minimum x-value of the superview's bounds.
Note that you can make a subview of the scroll view appear to float (not scroll) over the other scrolling content by creating constraints between the view and a view outside the scroll view's subtree, such as the scroll view's superview.
应用推荐
模块上移
模块下移
不移动