swift - iOS8: Auto-layout and Gradient -

setup:

i have view controller consists of view , container view.

the view (orange) pinned top 0, left 0, , right 0.

the container view (gray) pinned bottom 0, left 0, , right 0.

the view's bottom space to: container view = 0

the view's proportional height container view = 1

desired results: add gradient background of view (orange)

tried:

i'm using auto-layout class sizes different behavior on different screen.

code:

class viewcontroller: uiviewcontroller {      @iboutlet weak var graphview: uiview!     @iboutlet weak var containerview: uiview!     override func viewdidload() {         super.viewdidload()          let backgroundcolor = cagradientlayer().graphviewbackgroundcolor()         backgroundcolor.frame = self.graphview.frame          self.graphview.layer.addsublayer(backgroundcolor) } 

i have category:

extension cagradientlayer {      func graphviewbackgroundcolor() -> cagradientlayer {          let topcolor = uicolor(red: (160/255.0), green: (160/255.0), blue: (160/255.0), alpha: 1)         let bottomcolor = uicolor(red: (52/255.0), green: (53/255.0), blue: (52/255.0), alpha: 1)          let gradientcolors: [cgcolor] = [topcolor.cgcolor, bottomcolor.cgcolor]         let gradientlocations: [float] = [0.0, 1.0]          let gradientlayer: cagradientlayer = cagradientlayer()         gradientlayer.colors = gradientcolors         gradientlayer.locations = gradientlocations          return gradientlayer     } } 

result:

as can see gradient did not cover entire view.

question: how can gradient cover entire view

update:

when place code in viewdidlayoutsubviews() looks weird when rotate:

simply inside viewdidlayoutsubviews:

override func viewdidlayoutsubview() {   super.viewdidlayoutsubviews   backgroundcolor.frame = self.graphview.bounds } 

viewdidlayoutsubviews should called when rotate device.

if not called, override method , as,

override func viewwilltransitiontosize(size: cgsize, withtransitioncoordinator coordinator: uiviewcontrollertransitioncoordinator) {   super.viewwilltransitiontosize(size, withtransitioncoordinator: coordinator)    backgroundcolor.frame = self.graphview.bounds }