When tapped, a color well displays the system-provided color picker. People can use the color picker to choose a color for text, shapes, marking tools, and other elements.
The tabbed interface of the color picker lets people choose colors from a grid or spectrum, or by selecting RGB values. People can also select a color by tapping the eyedropper button and using the magnifying loupe to isolate a color that appears anywhere on the screen.
Prefer using the system-provided color picker to help people choose colors. Using the built-in color picker provides a consistent user experience, in addition to letting people save a set of colors they can access from any app. The system-defined color picker can also help the Mac version of your iPad app provide a familiar experience to macOS users.