UILabel sizing during device rotation

In my app I have two labels. Second one should be positioned below the first one (with some small const padding). The first label is multi-lined and takes all possible width. So after changing interface orientation, its real height can change (because necessary line n开发者_运维技巧umber can change). That's why autoresizing mask can't help me here.

So.. How can I control this and display labels correctly even during interface orientation change animation?

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Damn. I'm so sorry about this question. I've really googled before asking and tried to read docs. But somehow I've missed this and this with great details about my question.