Unity开发NGUI代码实现ScrollView(放大视图)

尊重原创，转载：http://www.cnblogs.com/daxiaxiaohao/p/4745549.html

Unity开发NGUI代码实现ScrollView(放大视图)

下载NGUI包
导入NGUI3.9.1版本package

创建MainCameraScript.cs脚本
MainCameraScript.cs

using UnityEngine;
using System.Collections;

public class MainCameraScript : MonoBehaviour {

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}

创建NGUI根节点的方法

	private GameObject Window{ set; get;}

	void CreateUI()
	{
		//创建根节点
		this.Window = NGUITools.CreateUI(false).gameObject;
	}

在Window上添加滚动子视图

	private UIScrollView scrollView;
	void CreateUI()
	{
		//创建根节点
		this.Window = NGUITools.CreateUI(false).gameObject;

		//在根节点上创建一个UIScrollView子控件
		this.scrollView = NGUITools.AddChild<UIScrollView>(this.Window);

	}

添加下载图片的方法

	private Texture texture;
	private UITexture	 imageView;

	//一个协程用到的函数,下载图片
	IEnumerator DownloadTexture()
	{
		WWW www = new WWW ("http://p.baidupcs.com/file/00fb26654a14f822a8b8d4f99bffff4f?bkt=p2-nj-562&fid=4213918792-250528-600499188078355&time=1440052584&sign=FDTAXERBH-DCb740ccc5511e5e8fedcff06b081203-JvUURjnKMtJDPCeN7DC01lNSiAM%3D&to=pb&fm=Nan,B,G,bs&sta_dx=0&sta_cs=0&sta_ft=png&sta_ct=0&fm2=Nanjing02,B,G,bs&newver=1&newfm=1&secfm=1&flow_ver=3&expires=8h&rt=sh&r=853121535&mlogid=2433540290&vuk=4213918792&vbdid=724775054&fin=icon.png&fn=icon.png&uta=0&rtype=0&iv=1&isw=0");
		
        yield return www;

		this.texture = www.texture;
	}

重置ScollView上的Panel对象

	/// <summary>
	/// 重置Panel对象
	/// </summary>
	/// <param name="panel">Panel.</param>
	void ResetPanel(UIPanel panel)
	{
		//缩小，并且居中显示
		panel.transform.localPosition = new Vector3(0,0,0);
		//设置移动的位置
		panel.clipOffset = new Vector2(0,0);
		//设置大小
		panel.baseClipRegion = new Vector4 (0, 0, 100, 100);

	}

设定滚动视图的一些属性

	private UIScrollView scrollView;
    void CreateUI()
	{
		//创建根节点
		this.Window = NGUITools.CreateUI(false).gameObject;

		//在根节点上创建一个UIScrollView子控件
		this.scrollView = NGUITools.AddChild<UIScrollView>(this.Window);
		//设定随意移动
		this.scrollView.movement = UIScrollView.Movement.Unrestricted;
		//重置panel对象
		ResetPanel (this.scrollView.GetComponent<UIPanel> ());
        //创建ImageView
		CreateImage();
	}

创建一个需要显示下载图片的ImageView

	private UITexture	 imageView;
	void CreateImage()
	{
		this.imageView =  NGUITools.AddChild<UITexture> (this.scrollView.gameObject);
		this.imageView.SetRect (-50, -50, 100, 100);

		//给图片对象添加缺失组件
		NGUITools.AddMissingComponent<UIDragScrollView> (this.imageView.gameObject);
		NGUITools.AddMissingComponent<BoxCollider> (this.imageView.gameObject);
		UIButton button = NGUITools.AddMissingComponent<UIButton> (this.imageView.gameObject);

		//添加按钮的触发事件,单击图片放大、缩小
		button.onClick.Add (new EventDelegate (() => {

			//小图片
			if (this.imageView.width == 100) {

				//放大
				this.imageView.SetRect(-512,-512,1024,1024);

			}
			else//大图片
			{
				ResetPanel(this.scrollView.GetComponent<UIPanel>());
				this.imageView.SetRect(-50,-50,100,100);
			}

		}));

		//设定碰撞器对象可以自动缩放
		this.imageView.autoResizeBoxCollider = true;
		this.imageView.ResizeCollider ();
	}

整个MainCameraScript.cs的代码如下

using UnityEngine;
using System.Collections;

public class MainCameraScript : MonoBehaviour {


	private GameObject Window{ set; get;}
	private Texture texture;

	IEnumerator DownloadTexture()
	{
		WWW www = new WWW ("http://p.baidupcs.com/file/00fb26654a14f822a8b8d4f99bffff4f?bkt=p2-nj-562&fid=4213918792-250528-600499188078355&time=1440052584&sign=FDTAXERBH-DCb740ccc5511e5e8fedcff06b081203-JvUURjnKMtJDPCeN7DC01lNSiAM%3D&to=pb&fm=Nan,B,G,bs&sta_dx=0&sta_cs=0&sta_ft=png&sta_ct=0&fm2=Nanjing02,B,G,bs&newver=1&newfm=1&secfm=1&flow_ver=3&expires=8h&rt=sh&r=853121535&mlogid=2433540290&vuk=4213918792&vbdid=724775054&fin=icon.png&fn=icon.png&uta=0&rtype=0&iv=1&isw=0");
		yield return www;

		this.texture = www.texture;
	}

	private UIScrollView scrollView;
	void CreateUI()
	{
		//创建根节点
		this.Window = NGUITools.CreateUI(false).gameObject;

		//在根节点上创建一个UIScrollView子控件
		this.scrollView = NGUITools.AddChild<UIScrollView>(this.Window);
		//设定随意移动
		this.scrollView.movement = UIScrollView.Movement.Unrestricted;
		//重置panel对象
		ResetPanel (this.scrollView.GetComponent<UIPanel> ());
        //创建ImageView
		CreateImage();
	}

	private UITexture	 imageView;
	void CreateImage()
	{
		this.imageView =  NGUITools.AddChild<UITexture> (this.scrollView.gameObject);
		this.imageView.SetRect (-50, -50, 100, 100);

		//给图片对象添加缺失组件
		NGUITools.AddMissingComponent<UIDragScrollView> (this.imageView.gameObject);
		NGUITools.AddMissingComponent<BoxCollider> (this.imageView.gameObject);
		UIButton button = NGUITools.AddMissingComponent<UIButton> (this.imageView.gameObject);

		//添加按钮的触发事件,单击图片放大、缩小
		button.onClick.Add (new EventDelegate (() => {

			//小图片
			if (this.imageView.width == 100) {

				//放大
				this.imageView.SetRect(-512,-512,1024,1024);

			}
			else//大图片
			{
				ResetPanel(this.scrollView.GetComponent<UIPanel>());
				this.imageView.SetRect(-50,-50,100,100);
			}

		}));

		//设定碰撞器对象可以自动缩放
		this.imageView.autoResizeBoxCollider = true;
		this.imageView.ResizeCollider ();
	}

	/// <summary>
	/// 重置Panel对象
	/// </summary>
	/// <param name="panel">Panel.</param>
	void ResetPanel(UIPanel panel)
	{
		//缩小，并且居中显示
		panel.transform.localPosition = new Vector3(0,0,0);
		//设置移动的位置
		panel.clipOffset = new Vector2(0,0);
		//设置大小
		panel.baseClipRegion = new Vector4 (0, 0, 100, 100);

	}


	// Use this for initialization
	void Start () {

		CreateUI ();

		StartCoroutine ("DownloadTexture");
	}
	
	// Update is called once per frame
	void Update () 
	{
		//设置图片
		if (this.texture != null && this.imageView.mainTexture == null) {
			this.imageView.mainTexture = this.texture;
		}
	}
}

效果如下