Creating SwiftPieChart: inner circle

PieChartView.swift

var body: some View {
        GeometryReader { geometry in
            ZStack{
                ForEach(0..<self.values.count){ i in
                    PieSliceView(pieSliceData: self.slices[i])
                }
                .frame(width: geometry.size.width, height: geometry.size.width)
                
                Circle()
                    .fill(self.backgroundColor)
                    .frame(width: geometry.size.width * innerRadiusFraction, height: geometry.size.width * innerRadiusFraction)
                
                VStack {
                    Text("Total")
                        .font(.title)
                        .foregroundColor(Color.gray)
                    Text(String(values.reduce(0, +)))
                        .font(.title)
                }
            }
            .background(self.backgroundColor)
            .foregroundColor(Color.white)
        }
    }