kCupertinoFocusColorOpacity top-level constant

double const kCupertinoFocusColorOpacity

The relative values needed to transform a color to it's equivalent focus outline color.

These are used to draw a focus ring around CupertinoSwitch, CupertinoCheckbox, CupertinoRadio and CupertinoButton.

See also:

• developer.apple.com/design/human-interface-guidelines/focus-and-selection/

Implementation

const double kCupertinoFocusColorOpacity = 0.80,
             kCupertinoFocusColorBrightness = 0.69,
             kCupertinoFocusColorSaturation = 0.835;