//旋转手机重新定位视图

/// <summary>

        /// 重新定位视图

        /// </summary>

        /// <param name="toInterfaceOrientation">To interface orientation.</param>

        /// <param name="duration">Duration.</param>

        public override void WillRotate(UIInterfaceOrientation toInterfaceOrientation, double duration)

        {

            UIInterfaceOrientation destOrientation = toInterfaceOrientation;

            //判断选择方向

            if (destOrientation == UIInterfaceOrientation.LandscapeLeft | destOrientation == UIInterfaceOrientation.LandscapeRight)

            {

                vv.Frame = new RectangleF(, , , );

            }

            else { 

                vv.Frame = new RectangleF(, ,  ,);

            }

        }