I could not get this to work, It sets an odd red tint, regardless of colour So after digging around on the modifiers. I found simply adding the modifier. .onAppear() {                         UITabBar.appearance().barTintColor = .black                            } Works

I just had this, for me it turned out that I needed to connect via cable to my Mac first, problem was I was using a third party cable. As a last ditched effort I dug out my apple cable (usbc-usbc) That did the trick I got all the prompts for trusting the device and then the Developer Mode option popup in the settings.