Round Specific Corners SwiftUI - iOS 13 Sample Project.swift

struct ContentView: View {
    @State var topLeft: CGFloat = 0
    @State var topRight: CGFloat = 50
    @State var bottomLeft: CGFloat = 50
    @State var bottomRight: CGFloat = 0

    var body: some View {
        VStack {
            HStack(spacing: 32) {
                Slider(value: $topLeft, in: 0...50)
                Slider(value: $topRight, in: 0...50)
            }

            Text("Round me")
                .frame(width: 200, height: 100)
                .background(Color.red)
                .cornerRadius(topLeft, corners: .topLeft)
                .cornerRadius(topRight, corners: .topRight)
                .cornerRadius(bottomLeft, corners: .bottomLeft)
                .cornerRadius(bottomRight, corners: .bottomRight)

            HStack(spacing: 32) {
                Slider(value: $bottomLeft, in: 0...50)
                Slider(value: $bottomRight, in: 0...50)
            }
        }.padding()
    }
}

extension View {
    func cornerRadius(_ radius: CGFloat, corners: UIRectCorner) -> some View {
        clipShape( RoundedCorner(radius: radius, corners: corners) )
    }
}

struct RoundedCorner: Shape {
    var radius: CGFloat = .infinity
    var corners: UIRectCorner = .allCorners

    func path(in rect: CGRect) -> Path {
        let path = UIBezierPath(roundedRect: rect, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        return Path(path.cgPath)
    }
}