ios - tableview contentsize not get updated, when changing NSLayoutConstraint's constant -


i have added bottom constraint on tableview, , change constant of constrain programmatically when keyboard appears. tableview's frame resizes, contentsize not updating, why? how can force recalculate.

i have tried many approach. 

nsnotificationcenter.defaultcenter().addobserverforname(uikeyboarddidshownotification, object: nil, queue:nsoperationqueue.mainqueue(), usingblock: {(notification: nsnotification?) -> () in      let keyboardsize = (notification!.userinfo![uikeyboardframebeginuserinfokey] as? nsvalue)!.cgrectvalue().size     self.bottomconstraint.constant = keyboardsize.height     self.view.layoutifneeded()      if let messagetableviewcontroller2 = messagetableviewcontroller, let messageviewsize2 = messageviewsize {          /*var frame = messagetableviewcontroller2.tableview.frame         frame.size.height = messageviewsize2.height - keyboardsize.height - 44         messagetableviewcontroller2.tableview.frame = frame*/          /*messagetableviewcontroller2.tableview.beginupdates()         messagetableviewcontroller2.tableview.layoutifneeded()         messagetableviewcontroller2.tableview.endupdates()          var frame = messagetableviewcontroller2.tableview.frame         frame.size.height = messagetableviewcontroller2.tableview.frame.size.height         messagetableviewcontroller2.tableview.frame = frame*/          /*let h = messagetableviewcontroller2.tableview.contentsize.height - keyboardsize.height + 44         println("messagetableviewcontroller2.tableview.contentsize: \(messagetableviewcontroller2.tableview.contentsize) h: \(h)")         messagetableviewcontroller2.tableview.contentsize = cgsizemake(messagetableviewcontroller2.tableview.contentsize.width, h)*/         /*messagetableviewcontroller2.tableview.setneedsupdateconstraints()         messagetableviewcontroller2.tableview.beginupdates()         messagetableviewcontroller2.tableview.endupdates()*/     } })

tableview.contentsize not change.

since update bottomconstraint of tableview. tableview.frame changed. contentsize property same.

tableview.contentsize updated, when cell in tableview change. example, insert, delete, reload.


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