如何在xamarin跨平台中通过按钮点击获取另一页面中滑块的值

<StackLayout>
    <Button Text="获取滑块值" Clicked="OnButtonClicked" />
</StackLayout>

private async void OnButtonClicked(object sender, EventArgs e)
{
    var sliderValue = await Navigation.PushAsync(new SecondPage());
    // 处理滑块值
}

<StackLayout>
    <Slider ValueChanged="OnSliderValueChanged" />
    <Button Text="返回" Clicked="OnBackButtonClicked" />
</StackLayout>

private double sliderValue;

private void OnSliderValueChanged(object sender, ValueChangedEventArgs e)
{
    sliderValue = e.NewValue;
}

private async void OnBackButtonClicked(object sender, EventArgs e)
{
    await Navigation.PopAsync(sliderValue);
}