防止在XF ScrollView中方向更改时自动滚动到顶部

using System.Reflection;
using Xamarin.Forms;

// 在方向更改时保持当前滚动位置
double previousScrollPosition = 0;

void OnOrientationChanged()
{
    ScrollView scrollView = // 获取ScrollView实例
    PropertyInfo positionPropertyInfo = typeof(ScrollView).GetProperty("position", BindingFlags.Instance | BindingFlags.NonPublic);
    double currentScrollPosition = (double)positionPropertyInfo.GetValue(scrollView);
    previousScrollPosition = currentScrollPosition;
}

void OnOrientationChangeCompleted()
{
    ScrollView scrollView = // 获取ScrollView实例
    PropertyInfo positionPropertyInfo = typeof(ScrollView).GetProperty("position", BindingFlags.Instance | BindingFlags.NonPublic);
    positionPropertyInfo.SetValue(scrollView, previousScrollPosition);
}