Is it possible to access the invert colors function that’s in iOS accessibility?

I don't know of a way to do this automatically, but you could invert colors yourself using an extension on UIColor and accessing the subviews?

extension UIColor { var inverted: UIColor { var r: CGFloat = 0.0, g: CGFloat = 0.0, b: CGFloat = 0.0, a: CGFloat = 0.0 self.getRed(&r, green: &g, blue: &b, alpha: &a) return UIColor(red: (1 - r), green: (1 - g), blue: (1 - b), alpha: a) // Assuming you want the same alpha value. } } 

And then if you want to update specific properties of the views you could do something like this:

 view.subviews.map { $0.backgroundColor = $0.backgroundColor.invertedColor } // And so on to change things like the tint color, text color, etc. 

Sorry, I don't know a way to do this directly but till then this is better than nothing I guess.

I know of no such API call, and frankly I'd be surprised if it was available. Generally, Apple does not provide system-wide settings to individual applications. However, you could implement this yourself—but only for your own app.

Now this can be done with a buid-in method from SwiftUI; colorInvert().

The colorInvert() modifier inverts all of the colors in a view so that each color displays as its complementary color. For example, blue converts to yellow, and white converts to black.

See: https://developer.apple.com/documentation/swiftui/view/colorinvert()

works in SwiftUI also:

extension NSColor { var inverted: NSColor { var r: CGFloat = 0.0, g: CGFloat = 0.0, b: CGFloat = 0.0, a: CGFloat = 0.0 self.getRed(&r, green: &g, blue: &b, alpha: &a) return NSColor(red: (1 - r), green: (1 - g), blue: (1 - b), alpha: a) } } extension Color { var inverted: Color { Color(nsColor: self.nsColor.inverted) } } @available(macOS 12.0, *) public extension Color { var nsColor: NSColor { NSColor(self) } var cgColor: CGColor { nsColor.cgColor } }