为了解决这个问题，您可以通过UIKeyboard.FrameEndUserInfoKey获得键盘的框架，并计算需要更改的高度。

NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));

CGSize keyboardSize = result.RectangleFValue.Size;

private void Entry_Focused(object sender, FocusEventArgs e)
{
    if (DeviceInfo.Current.Platform == DevicePlatform.iOS)
    {
       NFloat bottom;
        try
        {
             UIWindow window = UIApplication.SharedApplication.Delegate.GetWindow();
                bottom = window.SafeAreaInsets.Bottom;
        }
        catch
        {
             bottom = 0;
        }
        var heightChange = (keyboardSize.Height - bottom);
        layout.TranslateTo(0, originalTranslationY.Value - heightChange, 50);
    }
}

private void Entry_Unfocused(object sender, FocusEventArgs e)
{
    if (DeviceInfo.Current.Platform == DevicePlatform.iOS)
    {
        layout.TranslateTo(0, 0, 50);
    }
}

希望对你有用。