How to change the colors of a segment in a UISegmentedControl in iOS 13?

Question

A UISegmentedControl has a new appearance in iOS 13 and existing code to alter the colors of the segmented control no longer work as they did.

Prior to

Answer 1

As of Xcode 11 beta 3

There is now the selectedSegmentTintColor property on UISegmentedControl.

Thank you @rmaddy!

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Original answer, for Xcode 11 beta and beta 2

Is there a proper solution, using public APIs, that doesn't require digging into the private subview structure?

With Xcode 11.0 beta, it seems to be a challenge to do it by-the-rules, because it basically requires to redraw all the background images for every states by yourself, with round corners, transparency and resizableImage(withCapInsets:). For instance, you would need to generate a colored image similar to:

So for now, the let's-dig-into-the-subviews way seems much easier:

class TintedSegmentedControl: UISegmentedControl {

    override func layoutSubviews() {
        super.layoutSubviews()

        if #available(iOS 13.0, *) {
            for subview in subviews {
                if let selectedImageView = subview.subviews.last(where: { $0 is UIImageView }) as? UIImageView,
                    let image = selectedImageView.image {
                    selectedImageView.image = image.withRenderingMode(.alwaysTemplate)
                    break
                }
            }
        }
    }
}

This solution will correctly apply the tint color to the selection, as in: