NGUI深入理解-----------------UIRoot

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总览：NGUI深入理解

UIRoot，顾名思义，它是UI的根，非常重要。它保证gameobject的localScale保持在2/height。

使用UIRoot时要注意，他不能与UIOrthoCamera一起使用。

UIRoot中最重要的是activeHeight属性。

public int activeHeight{get{int height = Mathf.Max(2, Screen.height);if (scalingStyle == Scaling.FixedSize) return manualHeight;#if UNITY_IPHONE || UNITY_ANDROIDif (scalingStyle == Scaling.FixedSizeOnMobiles)return manualHeight;#endifif (height < minimumHeight) return minimumHeight;if (height > maximumHeight) return maximumHeight;return height;}}

以为这个属性决定了localScale，决定了pixelSizeAdjustment

void Update (){if (mTrans != null){float calcActiveHeight = activeHeight;if (calcActiveHeight > 0f ){float size = 2f / calcActiveHeight;Vector3 ls = mTrans.localScale;if (!(Mathf.Abs(ls.x - size) <= float.Epsilon) ||!(Mathf.Abs(ls.y - size) <= float.Epsilon) ||!(Mathf.Abs(ls.z - size) <= float.Epsilon)){mTrans.localScale = new Vector3(size, size, size);}}}}

UIRoot脚本很简单，核心Update就实现了一个功能，根据activeHeight来实时更新localScale。

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