Construct UIColor using HSB components in Display P3 color space.

UIColor+DisplayP3HSB.swift

extension UIColor {
    
    convenience init(displayP3Hue hue: CGFloat, saturation: CGFloat, brightness: CGFloat, alpha: CGFloat = 1) {
        /// HSB to RGB conversion doesn’t depend on color space, so we can use default UIColor space.
        let converter = UIColor(hue: hue, saturation: saturation, brightness: brightness, alpha: 1)
        
        var red: CGFloat = 0, green: CGFloat = 0, blue: CGFloat = 0
        converter.getRed(&red, green: &green, blue: &blue, alpha: nil)
        
        self.init(displayP3Red: red, green: green, blue: blue, alpha: alpha)
    }
    
}

UIColor(displayP3Hue: 0.2, saturation: 1, brightness: 1) // r 0,745 g 1,007 b -0,333 a 1,0

I forgot to say: I also get a warning saying:

[Graphics] UIColor created with component values far outside the expected range.