It also center aligns the view and superview.

它还让视图的中心跟父视图的中心对齐。

youdao

'Spacer view 4' has a bottom space constraint to superview.

间隔查看4 '的底部空间制约上海华。

youdao

Or if you do not want to have an image that big, make sure you put constraints on width and height and just center it the superview.

或者如果您不希望有大图片，请确保您对宽度和高度设置限制将其置于超级视图中。

youdao

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.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog

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.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog