ios - NSLayoutConstraint with VFL is working only horizontally when using '|' -


i have following implementation of uiview..

struct loginview { let loginview: uiview = uiview()  func layoutloginview() -> uiview {      loginview.translatesautoresizingmaskintoconstraints = false         loginview.backgroundcolor = uicolor.purple      return loginview   }  }

then, subview above in viewcontroller below..

class loginvc: uiviewcontroller {  private let instanceofloginview = loginview()  override func loadview() {     super.loadview()      view.addsubview(instanceofloginview.layoutloginview())  nslayoutconstraint.activate(nslayoutconstraint.constraints(withvisualformat: "h:|-[loginview]-|", options: [], metrics: [:], views: ["loginview":instanceofloginview.layoutloginview()]))  nslayoutconstraint.activate(nslayoutconstraint.constraints(withvisualformat: "v:|-[loginview]-|", options: [], metrics: [:], views: ["loginview":instanceofloginview.layoutloginview()]))  }

the problem 'h' side of nslayout working -check screenshot below-. 'v' not working.

however, when apply following "v:|-8-[loginview]-8-|", works!!!

could advise why doesn't "v:|-[loginview]-|" work, please..?

appreciate help!

enter image description here

when using vfl, - character means "use standard spacing".

in case:

    "h:|-[loginview]-|"     "v:|-[loginview]-|"

you saying "use layout margins" are, default:

    uiedgeinsets(top: 0.0, left: 16.0, bottom: 0.0, right: 16.0)

prior ios 11 .layoutmargins of root view managed view controller cannot changed. purple view cover full view, change vfl to:

    "h:|[loginview]|"     "v:|[loginview]|"

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