ngui引起unity鼠标位置会不断重置为中心点

最近调试的时候，发现游戏的鼠标会自己重置回游戏的中心位置。

找了半天发现是 ngui 的UICamera 里面会设置Cursor.lockState 。。

	static public KeyCode currentKey
	{
		get
		{
			return mCurrentKey;
		}
		set
		{
			if (mCurrentKey != value)
			{
				ControlScheme before = mLastScheme;
				mCurrentKey = value;
				mLastScheme = currentScheme;

				if (before != mLastScheme)
				{
					HideTooltip();

					if (mLastScheme == ControlScheme.Mouse)
					{
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6 || UNITY_4_7
						Screen.lockCursor = false;
						Screen.showCursor = true;
#else
                            //这里会重置位置
						//Cursor.lockState = CursorLockMode.None;
						//Cursor.visible = true;
#endif
					}
#if UNITY_EDITOR
					else if (mLastScheme == ControlScheme.Controller)
#else
					else
#endif
					{
						if (current != null && current.autoHideCursor)
						{
#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6 || UNITY_4_7
							Screen.showCursor = false;
							Screen.lockCursor = true;
#else
                            //这里会重置位置
							//Cursor.visible = false;
							//Cursor.lockState = CursorLockMode.Locked;
#endif
							// Skip the next 2 frames worth of mouse movement
							//mMouse[0].ignoreDelta = 2;
						}
					}

					if (onSchemeChange != null) onSchemeChange();
				}
			}
		}