Storing color in UIPasteboard

Question

I am trying to store a UIColor value in UIPasteboard.general.color property. When I try to access that property it always returns nil on the simulator (haven't tried on device). I am using iOS10.0 and Swifth 3.2.2 and latest XCode 9.0:

                    UIPasteboard.general.color = color
                    if let color = UIPasteboard.general.color {
                        print("color=\(color)")
                    }
                    else {
                        print("no color")
                    }

I tried using the colors property, but the behavior is the same, but strange: hasColors returns true, and colors is not nil, but the count of elements is 0:

                    UIPasteboard.general.colors = [color]
                    guard
                        UIPasteboard.general.hasColors, // ok
                        let colors = UIPasteboard.general.colors, // ok
                        0 < colors.count // fail
                    else {
                        print("no color")
                        return
                    }
                    print("color=\(colors[0])")

I must be doing something wrong here. I am using the convenience properties color and colors. Here are Apple's specs I'm following: https://developer.apple.com/documentation/uikit/uipasteboard/1622085-color and https://developer.apple.com/documentation/uikit/uipasteboard/1622078-colors