let gradinatLayer = CAGradientLayer()
    gradinatLayer.frame = self.collectionView.frame //self.currentViewController.view.frame

    let cgColors:[CGColorRef] = [UIColor.blackColor().colorWithAlphaComponent(0.7).CGColor, UIColor.clearColor().CGColor, UIColor.blackColor().colorWithAlphaComponent(0.7).CGColor]

    gradinatLayer.colors = cgColors
    gradinatLayer.startPoint = CGPointMake(0, 0.5)
    gradinatLayer.endPoint = CGPointMake(1.0, 0.5)
    gradinatLayer.locations = [0.15, 0.50, 0.85]

    self.collectionView.layer.insertSublayer(gradinatLayer, atIndex: 0)

//This doesn't work
self.collectionView.layer.shouldRasterize = true
self.collectionView.layer.rasterizationScale = UIScreen.mainScreen().scale