ios - UITableviewCell row height shrinking -


i have uitableviewcell 2 labels , switch. when switch value changes state off remove 1 of labels , when changed on added view. have used auto layout. when wanted add added lost constraints while removing. here code snippet 

- (void)willupdatecell:(sampletableviewcell *)cell{ nsindexpath *indexpath = [self.tableview indexpathforcell:cell];  if ([cell.messageswitch ison]) {     cell.messagedescription = [uilabel new];     cell.messagedescription.translatesautoresizingmaskintoconstraints = no;     cell.messagedescription.text = self.messages[indexpath.row][@"description"];     cell.messagedescription.numberoflines = 0;     cell.messagedescription.linebreakmode = nslinebreakbywordwrapping;     [cell.contentview addsubview:cell.messagedescription];       cell.left = [nslayoutconstraint constraintwithitem:cell.messagedescription                                              attribute:nslayoutattributetrailing                                              relatedby:nslayoutrelationequal                                                 toitem:cell.messageswitch                                              attribute:nslayoutattributetrailing                                             multiplier:1.0                                               constant:0];     cell.bottom = [nslayoutconstraint constraintwithitem:cell.messagedescription                                                attribute:nslayoutattributebottom                                                relatedby:nslayoutrelationequal                                                   toitem:cell.contentview                                                attribute:nslayoutattributebottom                                               multiplier:1.0                                                 constant:15];      cell.top = [nslayoutconstraint constraintwithitem:cell.messagedescription                                             attribute:nslayoutattributetop                                             relatedby:nslayoutrelationequal                                                toitem:cell.messagetitle                                             attribute:nslayoutattributetop                                            multiplier:1.0                                              constant:2];       cell.right = [nslayoutconstraint constraintwithitem:cell.messagedescription                                               attribute:nslayoutattributeleading                                               relatedby:nslayoutrelationequal                                                  toitem:cell.contentview                                               attribute:nslayoutattributeleading                                              multiplier:1.0                                                constant:15];      [cell.contentview addconstraints:@[cell.bottom,cell.left,cell.right,cell.top]];  }else{      [cell.messagedescription removefromsuperview]; }  [cell updatefont];  [cell.contentview updateconstraints];  [uiview animatewithduration:0.5 animations:^{      [cell.contentview setneedslayout];  }]; }

the issue have shrinking height of row when state of switch changes. spacing still remains after view removed. if tried reload table, tableview behaves weirdly. have attached code here reference. please suggest me can tableview shrink row height when subview removed.


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