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HeaderView(
    viewModel:
            .init(
                title: "Rotation",
                leftButtonTitle: "Done",
                leftButtonAction: {
                    presentationMode.wrappedValue.dismiss()
                }
            ),
    rightControls: {

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extension HeaderView where RightControls == EmptyView {
    init(viewModel: HeaderViewModel, @ViewBuilder leftControls: @escaping () -> LeftControls) {
        self.init(viewModel: viewModel, leftControls: leftControls, rightControls: { EmptyView() })
    }
}

extension HeaderView where LeftControls == EmptyView, RightControls == EmptyView {
    init(viewModel: HeaderViewModel) {
        self.init(viewModel: viewModel, leftControls: { EmptyView() }, rightControls: { EmptyView() })
    }

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extension HeaderView where LeftControls == EmptyView {
    init(viewModel: HeaderViewModel, @ViewBuilder rightControls: @escaping () -> RightControls) {
        self.init(viewModel: viewModel, leftControls: { EmptyView() }, rightControls: rightControls)
    }
}

lutes1

HeaderView(
    viewModel:
            .init(
                title: "Rotation",
                leftButtonTitle: "Done",
                leftButtonAction: {
                    presentationMode.wrappedValue.dismiss()
                }
            ),
    leftControls: { EmptyView() },

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 HeaderView(
    viewModel: .init(
         title: "Size",
         leftButtonTitle: "Done",
         leftButtonAction: {
             presentationMode.wrappedValue.dismiss()
         }
    ),
    leftControls: {
        Stepper(/*...*/)

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struct HeaderView<LeftControls: View, RightControls: View>: View {
    init(
      viewModel: HeaderViewModel, 
      @ViewBuilder leftControls: @escaping () -> LeftControls, 
      @ViewBuilder rightControls: @escaping () -> RightControls) {
      
        // Assignments removed for brevety
    }
    
    private var viewModel: HeaderViewModel

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struct HeaderView: View {
    var viewModel: HeaderViewModel
    var body: some View {
        ZStack {
            HStack {
                if let leftButtonTitle = viewModel.leftButtonTitle {
                    Button(leftButtonTitle) {
                        viewModel.leftButtonAction?()
                    }
                }

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class HeaderViewModel {
    init(
      title: String, 
      leftButtonTitle: String? = nil, 
      leftButtonAction: (() -> ())? = nil, 
      sizeControlCallback: Binding<Int>? = nil, 
      sizeIndicator: String? = nil, 
      colorIndicator: UIColor? = nil, 
      tiltIndicator: String? = nil) {
        // Assignments removed here for brevity