ios - systemLayoutSizeFittingSize not returning size.. height is always 0 -


i have custom nib have set utilize uitableview header. in nib have 3 labels, in first 2 changes height dynamically. can see height in uiview being changed , rendering fine, trying utilize systemlayoutsizefittingsize actual height of custom uiview uitableviewcell doesn't overlap. however, every time try utilize systemlayoutsizefittingsize view's height, keep getting 0. have made call in pretty viewload's methods, , have never seen height being changed. know might missing? setting nib's constraints within nib file.


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