Flexible Box Layout (a. k. a. Flexbox) or display: inline-block and regular text wrapping can help with that.

弹性盒布局（即Flexbox），或者display： inline-block 加上常规的文本折行行为，都可以实现这一点。

youdao

Now, auto layout interprets UILayoutAttributeBottom as the bottom of the text box (presuming the label is not bigger than its intrinsic content size) and UILayoutAttributeBaseline as the baseline of the text.

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