When presenting the UIColorPickerViewController directly in a Catalyst app selecting a color will invoke
colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController)
However if you click the "Show Colors" button to see the expanded color selection pop over then the change or selection of colours in this window won't invoke
colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController)
and there doesn't seem to be a way to capture the color.
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