ios - Child view controller resizes when I reopen the height -


i have 3 view controllers embed inside scrollview, snapchat style (so can swipe between them). i'm facing weird problem nav bar appears squished against status bar,

squished image

but when leave app (go home screen example) , come back, moves down.

normal nav bar

here's code:

        let storyboard = uistoryboard(name: "main", bundle: bundle.main)          self.mainscrollview.delayscontenttouches = false          let v1 = storyboard.instantiateviewcontroller(withidentifier: "profileviewcontroller") as! profileviewcontroller          self.addchildviewcontroller(v1)         self.mainscrollview.addsubview(v1.view)         v1.didmove(toparentviewcontroller: self)          //--------          let v2 : recordviewcontroller = recordviewcontroller(nibname: "recordviewcontroller", bundle: nil)          self.addchildviewcontroller(v2)         self.mainscrollview.addsubview(v2.view)         v2.didmove(toparentviewcontroller: self)          //--------          let v3 = storyboard.instantiateviewcontroller(withidentifier: "discoverviewcontroller") as! discoverviewcontroller          self.addchildviewcontroller(v3)         self.mainscrollview.addsubview(v3.view)         v3.didmove(toparentviewcontroller: self)           //--------         var v1frame : cgrect = self.mainscrollview.bounds         v1frame.origin.x = 0         v1.view.frame = v1frame         //v1.view.bindframetosuperviewbounds()          var v2frame : cgrect = self.mainscrollview.bounds         v2frame.origin.x = self.view.frame.width         v2.view.frame = v2frame          var v3frame : cgrect = self.mainscrollview.bounds         v3frame.origin.x = self.view.frame.width*2         v3.view.frame = v3frame

my solutions far have been programmatically adding constraints, can't figure out should add constraints to. here's tried

    let csh = nslayoutconstraint.constraints(withvisualformat: "h:|-0-[v]-0-|", options: [], metrics: [:], views: ["v": recordview])     let csv = nslayoutconstraint.constraints(withvisualformat: "v:|-0-[v]-0-|", options: [], metrics: [:], views: ["v": recordview])      view.addconstraints(csh)     view.addconstraints(csv)

select field want edit. make settings picture. hope helps.

image click ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­


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