ios - Collapse Expand UITableView -

i tried expand/collapse uitableview inside uiviewcontroller. put uitableview height constraint 0 , make animation

func collapseexpandroomsection() {      isroomcollapsed = !isroomcollapsed      tableheightconstraint.constant = isroomcollapsed ? 0.0 : totaltableheight          uiview.animatewithduration(0.3) {         self.view.layoutifneeded()      }  } 

the collapse effect works fine when tried expand table cells gone.

thanks

look have updated constraint, should doing in order believe:

self.view.setneedsupdateconstraints() self.view.setneedslayout() self.view.layoutifneeded() 

as have updated constraint, therefore should firstly update set update constraints , set needs layout. followed layoutifneeded() have change apply immediately.

as discussed briefly on comments, code applicable if override updateconstraint. not correct in answering question above.