热门使用AutoLayout获取UILabel宽度？

I might missing something very trivial here, but I can't figure out how to get the width of my UILabel. Note that is it being added programatically, and the it's size fits the text inside it (the text vary from 2 to 35 characters). It automatically fits the right width of it's content, but I need to get the width.I might missing something very trivial here, bu