Disable background color and suppress warnings

.gitignore

@@ -16,6 +16,7 @@ DerivedData
 *.hmap
 *.ipa
 *.xcuserstate
+.DS_Store
 
 # CocoaPods
 #

TZStackView/TZStackView.swift

@@ -605,4 +605,29 @@ public class TZStackView: UIView {
         }
         return animatingToHiddenViews.indexOf(view) != nil
     }
+
+    // Disables setting the background color to mimic an actual UIStackView which is a non-drawing view.
+    override public class func layerClass() -> AnyClass {
+        return CATransformLayer.self
+    }
+
+    // Suppress the warning of "changing property backgroundColor in transform-only layer, will have no effect"
+    override public var backgroundColor: UIColor? {
+        get {
+            return nil
+        }
+        set {
+
+        }
+    }
+
+    // Suppress the warning of "changing property opaque in transform-only layer, will have no effect"
+    override public var opaque: Bool {
+        get {
+            return true
+        }
+        set {
+
+        }
+    }
 }