GUI.BeginScrollView 开始滚动视图

static function BeginScrollView (position : Rect, scrollPosition : Vector2, viewRect : Rect) : Vector2
static function BeginScrollView (position : Rect, scrollPosition : Vector2, viewRect : Rect, alwaysShowHorizontal : bool, alwaysShowVertical : bool) : Vector2
static function BeginScrollView (position : Rect, scrollPosition : Vector2, viewRect : Rect, horizontalScrollbar : GUIStyle, verticalScrollbar : GUIStyle) : Vector2
static function BeginScrollView (position : Rect, scrollPosition : Vector2, viewRect : Rect, alwaysShowHorizontal : bool, alwaysShowVertical : bool, horizontalScrollbar : GUIStyle, verticalScrollbar : GUIStyle) : Vector2

Parameters参数

• position
  Rectangle on the screen to use for the ScrollView.
  用于滚动视图在屏幕上矩形的位置
• scrollPosition
  The position to use display.
  用来显示滚动位置
  
• viewRect
  The rectangle used inside the scrollview.
  滚动视图内使用的矩形
• alwayShowHorizontal
  Optional parameter to always show the horizontal scrollbar. If false or left out, it is only shown when clientRect is wider than position.
  可选参数，总是显示水平滚动条，如果false或者不设置，它仅在内矩形比外矩形大的时候显示。
• alwayShowVertical
  Optional parameter to always show the vertical scrollbar. If false or left out, it is only shown when clientRect is taller than position.
  可选参数，总是显示垂直滚动条，如果false或者不设置，它仅在内矩形比外矩形大的时候显示。
• horizontalScrollbar
  Optional GUIStyle to use for the horizontal scrollbar. If left out, the horizontalScrollbar style from the current GUISkin is used.
  用于水平滚动条的可选GUIStyle，如果不设置，水平滚动条样式应用当前的GUISkin皮肤。
• verticalScrollbar
  Optional GUIStyle to use for the vertical scrollbar. If left out, the verticalScrollbar style from the current GUISkin is used.
  用于垂直滚动条的可选GUIStyle，如果不设置，垂直滚动条样式应用当前的GUISkin皮肤。

Vector2 - The modified scrollPosition. Feed this back into the variable you pass in, as shown in the example.

返回Vector2类型，被修改的滚动位置scrollPosition。返回值应回传给你的变量，看下面的例子。

Description描述

Begin a scrolling view inside your GUI.

在你的GUI里，开始一个滚动视图， 注意BeginScrollView和EndScrollView它们是成对出现的。

ScrollViews let you make a smaller area on-screen look 'into' a much larger area, using scrollbars placed on the sides of the ScrollView.

滚动视图让你在屏幕上一个小的区域，使用滚动是视图的滚动条查看一个大的区域。

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public Vector2 scrollPosition = Vector2.zero;
	void OnGUI() {
		scrollPosition = GUI.BeginScrollView(new Rect(10, 300, 100, 100), scrollPosition, new Rect(0, 0, 220, 200));
		GUI.Button(new Rect(0, 0, 100, 20), "Top-left");
		GUI.Button(new Rect(120, 0, 100, 20), "Top-right");
		GUI.Button(new Rect(0, 180, 100, 20), "Bottom-left");
		GUI.Button(new Rect(120, 180, 100, 20), "Bottom-right");
		GUI.EndScrollView();
	}
}

//定义默认的滚动条位置为0,0
var scrollPosition : Vector2 = Vector2.zero;

function OnGUI () {
	//我们创建一个100,100的滚动视图，滚动内容为220,200，就是我们要查看的内容比滚动视图大
	scrollPosition = GUI.BeginScrollView (Rect (10,300,100,100),scrollPosition, Rect (0, 0, 220, 200));

	// 我们创建一个100,100的滚动视图，滚动内容为220,200，就是我们要查看的内容比滚动视图大
	// 返回值赋回给我们定义的变量
	GUI.Button (Rect (0,0,100,20), "Top-left");
	GUI.Button (Rect (120,0,100,20), "Top-right");
	GUI.Button (Rect (0,180,100,20), "Bottom-left");
	GUI.Button (Rect (120,180,100,20), "Bottom-right");

	// 结束滚动视图
	GUI.EndScrollView ();
}