I have created a minimalistic example project at GitHub: https://github.com/Harold-D/PDFView_Representable illustrating the problem.

I have wrapped an PDFKit.PDFView in a UIViewRepresentable. It works correctly but, when setting the PDF in updateUIView(), I get a lot of

AttributeGraph: cycle detected through attribute xxx

errors.

This drives me crazy because I cannot figure out why. Help is much appreciated.

struct MyPDFView: UIViewRepresentable {
    typealias UIViewType = PDFView
    @State var pdf: Data

    func makeUIView(context: UIViewRepresentableContext<MyPDFView>) -> UIViewType {
        return PDFView()
    }

    func updateUIView(_ view: UIViewType, context: UIViewRepresentableContext<MyPDFView>) {
        debugPrint("update view")
        view.document = PDFDocument(data: pdf)

    }
}

struct ContentView: View {
    @State var togglePDF = true

    var body: some View {
        VStack {
            Button {
                togglePDF.toggle()
            } label: {
                Text("Change PDF")
                    .padding()
                    .foregroundColor(.white)
                    .background(Color.blue)
                    .cornerRadius(15)
            }
            MyPDFView(pdf: loadPDFAsData(togglePDF: togglePDF))
        }
    }

    private func loadPDFAsData(togglePDF: Bool) -> Data{
        let fileName = (togglePDF ? "1" : "2")

        guard let pdfURL = Bundle.main.url(forResource: fileName, withExtension: "pdf") else {
            fatalError("Could not find PDF")
        }

        do {
            return try Data(contentsOf: pdfURL)
        } catch {
            fatalError("Could not load PDF")
        }
    }
}