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１．Xcode9

２．識別方法

３．画面サイズ

<plist version="1.0">
<dict>
    <key>UILaunchStoryboardName</key>
    <string>LaunchScreen</string>
</dict>
</plist>

４．広告の調整

public class BaseContentPage : ContentPage
{
    public BaseContentPage() : base()
    {
        if (DependencyService.Get<IDeviceService>().GetModelNumber().Contains("X"))
        {
            this.Padding = new Thickness(0, 0, 0, 23);
        }

        //または以下のように記述すると簡単ですが、全面画面を活かしきれないと考えます。
        //NuGet Xamarin.Forms 2.4.0.74863 が必要です。（検証も必要です）
        //using Xamarin.Forms.PlatformConfiguration.iOSSpecific;
        //On<Xamarin.Forms.PlatformConfiguration.iOS>().SetUseSafeArea(true);
    }
}

５．セカンダリツールバー

public override void ViewDidLayoutSubviews()
{
    base.ViewDidLayoutSubviews();

    if (View != null)
    {
        UIView[] subviews = View.Subviews.Where(v => v != NavigationBar).ToArray();
        var toolBarViews = subviews.Where(v => v is UIToolbar).ToArray();
        var otherViews = subviews.Where(v => !(v is UIToolbar)).ToArray();

        nfloat toolbarHeight = 0;

        //iPhone X 用のマイクスペース部分だけ上に表示する
        nfloat bottomMargin = 0;
        if (DependencyService.Get<IDeviceService>().GetModelNumber().Contains("X"))
        {
            bottomMargin = 23;
        }

        foreach (var uIView in toolBarViews)
        {
            uIView.SizeToFit();
            uIView.Frame = new CGRect
            {
                X = 0,
                Y = View.Bounds.Height - uIView.Frame.Height - bottomMargin,
                Width = View.Bounds.Width,
                Height = uIView.Frame.Height,
            };
            var thisToolbarHeight = uIView.Frame.Height;
            if (toolbarHeight < thisToolbarHeight)
            {
                toolbarHeight = thisToolbarHeight;
            }
        }

        var othersHeight = View.Bounds.Height - toolbarHeight;
        var othersFrame = new CGRect(View.Bounds.X, View.Bounds.Y, View.Bounds.Width, othersHeight - bottomMargin);
        foreach (var uIView in otherViews)
        {
            uIView.Frame = othersFrame;
        }
    }
}