NGUI位置计算

判断是否在屏幕内

       private void Awake()
        {
            screenHeight = (float)Screen.height;
            screenWidth = (float)Screen.width;
            if ((float)Screen.width / Screen.height > (float)UIRoot.list[0].manualWidth / UIRoot.list[0].manualHeight)
            {
                screenScale = UIRoot.list[0].manualHeight / screenHeight;
                manualHeight_2 = UIRoot.list[0].manualHeight / 2;
                manualWidth_2 = (int)(Screen.width * screenScale) / 2;
            }
            else
            {
                screenScale = UIRoot.list[0].manualWidth / screenWidth;
                manualHeight_2 = (int)(Screen.height * screenScale) / 2;
                manualWidth_2 = UIRoot.list[0].manualWidth / 2;
            }
        }

          private bool IsInScreen(Vector3 pos)
        {
            if (pos.x < -1 * manualWidth_2 || pos.x > manualWidth_2 || pos.y < -1 * manualHeight_2 || pos.y > manualHeight_2)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

这种计算是针对NGUI适配模式为Constrained。如果屏幕宽高比大于开发时的宽高比，说明屏幕更宽。这时候以高度为适配。否则以宽度适配。得出实际的宽高。

参考：
Unity NGUI屏幕适配

判断是否点击了屏幕

 private bool _checkMouseClick = false;
        public void Update()
        {
            if (_checkMouseClick && (Input.GetMouseButton(0) || (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved))) {
                if (TextPanel.activeSelf) {
                    TextPanel.CustomSetActive(false);
                    _checkMouseClick = false;
                }
            }
        }

计算点击位置

 void SetAnchor(Vector2 screenPos)
        {
            // Vector2 screenPos = UICamera.lastEventPosition;
            Vector3 worldPos = UICamera.currentCamera.ScreenToWorldPoint(new Vector3(Mathf.Clamp(screenPos.x, BG.width * ((float)Screen.width / (float)UIRoot.list[0].manualWidth) / 2, (Screen.width - BG.width * ((float)Screen.width / (float)UIRoot.list[0].manualWidth) / 2)), screenPos.y));
            Bounds abs = NGUIMath.CalculateAbsoluteWidgetBounds(controller.transform.GetChild(0));
            float aspect = (float)Screen.width / (float)Screen.height;
            Vector4 worldMargin = Margin * 2.0f / (float)UIRoot.list[0].manualHeight;
            worldPos.x = Mathf.Clamp(worldPos.x, -aspect + worldMargin.x, aspect - worldMargin.y);
            Vector3 currentPos = controller.transform.GetChild(0).position;
            currentPos.x = worldPos.x;
            if (worldPos.y >= 1f - worldMargin.w - abs.size.y - 0.2f)
            {
                currentPos.y = worldPos.y - abs.size.y / 2 - 0.1f;
            }
            else
            {
                currentPos.y = worldPos.y + abs.size.y / 2 + 0.1f;
            }

            controller.transform.GetChild(0).position = currentPos;
        }