objective c - Unable to set top margin NSLayout Constraint programatically in iOS? -

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i trying set top margin constraint not work.i have custom cell in have 2 labels.i want give top spacing dynamic @ run time between labels have set constraint of top margin & have made outlet of & using below code update top margin.

 self.view.translatesautoresizingmaskintoconstraints = no;             self.customcell.nslc_first_comment_margin.constant=-21;             [self.customcell.first_comment layoutifneeded];

please tell how solve problem?

edit: code works if write code inside cellforrowatindexpath not work under heightforrowatindexpath?can please tell exact reason behaviour.


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