问题描述：

在使用Xamarin Forms 3.6版本，并且在Visual=Material模式下，当编辑器和键盘重叠时，无法正常工作。

解决方法：

解决这个问题的方法是使用自定义Renderer来处理编辑器和键盘的重叠问题。以下是一个示例：

在iOS项目中创建一个自定义Renderer类，继承EditorRenderer，并重写OnElementChanged方法。

using System;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(Editor), typeof(CustomEditorRenderer))]
namespace YourNamespace.iOS
{
    public class CustomEditorRenderer : EditorRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.AutoresizingMask = UIViewAutoresizing.None;
                Control.ScrollEnabled = true;
                Control.TextContainerInset = new UIEdgeInsets(8, 0, 8, 0);
                Control.TextContainer.LineFragmentPadding = 0;
            }
        }
    }
}

在iOS项目中的AppDelegate.cs文件中，添加以下代码：

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    global::Xamarin.Forms.Forms.Init();
    LoadApplication(new App());

    // 订阅键盘显示和隐藏事件
    KeyboardVisibilityService.Init();

    return base.FinishedLaunching(app, options);
}

创建一个名为KeyboardVisibilityService的新类，在其中处理键盘显示和隐藏的逻辑。

using System;
using UIKit;
using Xamarin.Forms;

namespace YourNamespace.iOS
{
    public static class KeyboardVisibilityService
    {
        public static void Init()
        {
            // 订阅键盘显示和隐藏事件
            KeyboardHelper.KeyboardWillShow += OnKeyboardShown;
            KeyboardHelper.KeyboardWillHide += OnKeyboardHidden;
        }

        static void OnKeyboardShown(object sender, KeyboardHelperEventArgs e)
        {
            if (Device.RuntimePlatform == Device.iOS)
            {
                var window = UIApplication.SharedApplication.KeyWindow;
                var activeView = window?.Subviews.FirstOrDefault(view => view.IsFirstResponder);
                if (activeView != null)
                {
                    var renderer = Platform.GetRenderer(activeView);
                    var view = renderer?.NativeView;

                    if (view != null)
                    {
                        var keyboardFrame = e.FrameEnd;
                        var intersection = keyboardFrame.Intersect(view.Frame);
                        var isKeyboardOverlapping = intersection.Height > 0;

                        if (isKeyboardOverlapping)
                        {
                            var scrollView = GetScrollView(activeView);
                            if (scrollView != null)
                            {
                                var contentInsets = new UIEdgeInsets(0.0f, 0.0f, intersection.Height, 0.0f);
                                scrollView.ContentInset = contentInsets;
                                scrollView.ScrollIndicatorInsets = contentInsets;
                            }
                        }
                    }
                }
            }
        }

        static void OnKeyboardHidden(object sender, KeyboardHelperEventArgs e)
        {
            if (Device.RuntimePlatform == Device.iOS)
            {
                var window = UIApplication.SharedApplication.KeyWindow;
                var activeView = window?.Subviews.FirstOrDefault(view => view.IsFirstResponder);
                if (activeView != null)
                {
                    var renderer = Platform.GetRenderer(activeView);
                    var view = renderer?.NativeView;

                    if (view != null)
                    {
                        var scrollView = GetScrollView(activeView);
                        if (scrollView != null)
                        {
                            var contentInsets = UIEdgeInsets.Zero;
                            scrollView.ContentInset = contentInsets;
                            scrollView.ScrollIndicatorInsets = contentInsets;
                        }
                    }
                }
            }
        }

        static UIScrollView GetScrollView(UIView view)
        {
            if (view == null)
                return null;

            if (view is UIScrollView scrollView)
                return scrollView;

            foreach (UIView subview in view.Subviews)
            {
                var scrollViewFound = GetScrollView(subview);
                if (scrollViewFound != null)
                    return scrollViewFound;
            }

            return null;
        }
    }
}

这些代码片段将处理编辑器和键盘重叠问题，并确保在键盘显示和隐藏时，内容正确地滚动到可见区域。

请注意，这些代码是基于Xamarin Forms 3.6版本和iOS平台的示例。如果使用的是其他版本或其他平台，请根据需要进行相应的调整。