GUIStyle.onActive 在激活时

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
		void OnGUI() {
		if (GUI.skin.customStyles.Length > 0)
			GUI.skin.customStyles[0].onActive.textColor = Color.yellow;

	}
}

// Sets the text color to yellow of customStyles[0] when an
// element is turned on and pressed down
//当元素被打开并且被按下时，设置customStyles[0]的文本颜色为黄色

function OnGUI() {
	if(GUI.skin.customStyles.Length > 0)
		GUI.skin.customStyles[0].onActive.textColor = Color.yellow;
}