swift - How do I align a button under a label in Xcode 6? -

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i'm watching stanford's cs193p lectures itunes u , first demo has been calculator. in second lecture, professor aligns buttons bottom edge of display label using black grid line appears. how enable grid line, know buttons directly below label?

i'm having same issue. resize label remove previous fix , set manually height value as: 38 , blue line appears. enter image description here


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