They most likely used a foregroundStyle with a linearGradient. An example would be similar to (assuming the charts left legend are these numbers, and the max is 11, the min is 8) let blueLocation: Double = 1 - ((11 - 9) / (11 - 8)) let yellowLocation: Double = 1 - ((11 - 10) / (11 - 8)) LineMark(x: .., y: ..).foregroundStyle(.linearGradient(stops: [.init(color: .blue, location 0.0), .init(color: .blue, location: blueLocation), .init(color: .yellow, location: blueLocation+.0001), .... ])

This is fantastic tedrog36, I used your 'fix' and created a wrapper header, that only imports the auto-generated "AppName-swift.h", with your clang diagnostic statements, and then I can just import that wrapper header in all the places I was previously importing the auto-generated one.