Swift 5 This will highlight the pickerView row to whatever you set 'tintColor' to func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {    pickerView.subviews[0].subviews[0].subviews[2].backgroundColor = pickerView.tintColor;

Hmm, talk about unintuitive interface - poor, UX

System status has been showing App Store Connect App Processing - Outage since 5:15pm on 13 Jan, 2021 (over 24 hours without being fixed!) check this link [https://developer.apple.com/system-status/] Apple's problem