Get dark style of UIColor

Question

I have this UIColor:

The left color is shown on light appearance

The right color is shown on dark appearance

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I want to be able to get the right color when the device is on light appearance,

and be able to get the left color when the device is on dark appearance.

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I know I can just duplicate it and create another color, and use that one, but is there a way to get all the variations from a UIColor variable from code? thanks

Answer 1

You can use UIColor method func resolvedColor(with traitCollection: UITraitCollection) -> UIColor and select the desired trait collection:

extension UIColor {
    var dark: UIColor  { resolvedColor(with: .init(userInterfaceStyle: .dark))  }
    var light: UIColor { resolvedColor(with: .init(userInterfaceStyle: .light)) }
}

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Example

let systemPurple = UIColor.systemPurple   // r 0,686 g 0,322 b 0,871 a 1,0
systemPurple.dark                         // r 0,749 g 0,353 b 0,949 a 1,0
systemPurple.light                        // r 0,686 g 0,322 b 0,871 a 1,0