diff --git a/MVMCoreUI/Atoms/Views/GraphView.swift b/MVMCoreUI/Atoms/Views/GraphView.swift
index cda77660..1f6ea45b 100644
--- a/MVMCoreUI/Atoms/Views/GraphView.swift
+++ b/MVMCoreUI/Atoms/Views/GraphView.swift
@@ -112,7 +112,9 @@ import UIKit
         //if number of colors is even, need to display gradient layer, otherwise make top layer as solid color layer
         if graphObject.colors.count % 2 == 0 {
             leftColors.removeLast()
-            topLayer.colors = [leftColors.last!, rightColors.first!]
+            let firstColor = leftColors.last!.uiColor.cgColor
+            let secondColor = rightColors.first!.uiColor.cgColor
+            topLayer.colors = [firstColor, secondColor]
         } else {
             topLayer.backgroundColor = leftColors.last?.uiColor.cgColor
         }
@@ -125,7 +127,9 @@ import UIKit
         
         //count of graidentLayer.colors must be bigger than 1, otherwise set backgroundColor
         if leftColors.count > 1 {
-            leftLayer.colors = Array(leftColors)
+            leftLayer.colors = leftColors.map({ (color) -> CGColor in
+                return color.uiColor.cgColor
+            })
         } else {
             leftLayer.backgroundColor = leftColors.first?.uiColor.cgColor
         }
@@ -136,7 +140,9 @@ import UIKit
         rightLayer.startPoint = CGPoint(x: 0, y: 0)
         rightLayer.endPoint = CGPoint(x: 0, y: 1)
         if rightColors.count > 1 {
-            rightLayer.colors = Array(rightColors)
+            rightLayer.colors = rightColors.map({ (color) -> CGColor in
+                return color.uiColor.cgColor
+            })
         } else {
             rightLayer.backgroundColor = rightColors.first?.uiColor.cgColor
         }