如何在签名板xamarin forms上绑定签名字节数组？

private byte[] signatureData;
public byte[] SignatureData
{
    get { return signatureData; }
    set { SetProperty(ref signatureData, value); }
}

<local:SignatureView SignatureData="{Binding SignatureData}" />

public class SignatureView : ContentView
{
    private SignaturePadView signaturePad;

    public SignatureView()
    {
        signaturePad = new SignaturePadView();
        signaturePad.StrokeCompleted += OnStrokeCompleted;

        Content = signaturePad;
    }

    private void OnStrokeCompleted(object sender, EventArgs e)
    {
        var image = signaturePad.GetImage();
        SignatureData = ConvertImageToByteArray(image);
    }

    private byte[] ConvertImageToByteArray(SKImage image)
    {
        using (var data = image.Encode())
        {
            return data.ToArray();
        }
    }

    public static readonly BindableProperty SignatureDataProperty =
        BindableProperty.Create(nameof(SignatureData), typeof(byte[]), typeof(SignatureView), null);

    public byte[] SignatureData
    {
        get { return (byte[])GetValue(SignatureDataProperty); }
        set { SetValue(SignatureDataProperty, value); }
    }
}