using UnityEngine;

using System.Collections;

public class Item

{

    public string Id;

    public string Name;

    public string ParentId;

    public Item(string name, string id, string parentid)

    {

        this.Name = name;

        this.Id = id;

        this.ParentId = parentid;

    }

}

using UnityEngine;

using System.Collections;

using System.Collections.Generic;

public class NodeMessage : MonoBehaviour

{

    public string Tag;

    public List<NodeMessage> NodeList;

}

using UnityEngine;

using System.Collections;

using System.Collections.Generic;

using System.Xml;

public class TreeNode : MonoBehaviour

{

    public GameObject Panel;

    public List<Item> ItemList;

    dfScrollPanel scrollpanel;

    void Start()

    {

        scrollpanel = this.GetComponent<dfScrollPanel>();

        ReadXML();

        AddNodes();

    }

    void AddNodes()

    {

        for (int i = ; i < ItemList.Count; i++)

        {

            if (ItemList[i].ParentId == "")

            {

                var treeNode = scrollpanel.AddPrefab(Panel);

                var newNode = treeNode.GetComponent<NodeMessage>();

                newNode.Tag = ItemList[i].Id;

                treeNode.Find("Sprite").GetComponent<dfSprite>().SpriteName = "ArrowNormal";

                treeNode.Find("Node").GetComponent<dfButton>().Text = ItemList[i].Name;

                AddChildNodes(newNode);

            }

        }

        foreach (Transform child in scrollpanel.transform)

        {

            var TreeNode = child.GetComponent<NodeMessage>();

            if (TreeNode.NodeList.Count == )

            {

                dfPanel NodePanel = child.GetComponent<dfPanel>();

                NodePanel.Find("Sprite").GetComponent<dfSprite>().IsVisible = false;

            }

        }

    }

    public void AddChildNodes(NodeMessage message)

    {

        for (int i = ; i < ItemList.Count; i++)

        {

            if (ItemList[i].ParentId == message.Tag)

            {

                var treeNode = scrollpanel.AddPrefab(Panel);

                var newNode = treeNode.GetComponent<NodeMessage>();

                newNode.Tag = ItemList[i].Id;

                treeNode.Find("Node").GetComponent<dfButton>().Text = ItemList[i].Name;

                treeNode.Find("Sprite").GetComponent<dfSprite>().SpriteName = "ArrowNormal";

                var parentTransform = message.GetComponent<dfPanel>().Find("Panel").transform;

                treeNode.Find("Panel").transform.localPosition = new Vector2(parentTransform.localPosition.x + 0.1f, );

                message.NodeList.Add(newNode);

                AddChildNodes(newNode);

                treeNode.IsVisible = false;

            }

        }

    }

    public void tubiaoOnClick(bool isShow, string tag, List<NodeMessage> nodelist)

    {

        for (int i = ; i < ItemList.Count; i++)

        {

            if (ItemList[i].Id == tag)

            {

                SelectNodeList(isShow, nodelist);

            }

        }

    }

    void SelectNodeList(bool isShow, List<NodeMessage> nodelist)

    {

        for (int j = ; j < nodelist.Count; j++)

        {

            dfPanel NodePanel = nodelist[j].GetComponent<dfPanel>();

            var node = NodePanel.GetComponent<NodeMessage>();

            if (isShow == true)

            {

                NodePanel.IsVisible = true;

            }

            else

            {

                tubiaoOnClick(isShow, node.Tag, node.NodeList);

                NodePanel.IsVisible = false;

                NodePanel.Find("Sprite").GetComponent<dfSprite>().SpriteName = "ArrowNormal";

                NodePanel.Find("tubiao").GetComponent<TuBiao>().isShow = false;

            }

        }

    }

    void ReadXML()

    {

        XmlDocument doc = new XmlDocument();

        doc.Load(Application.dataPath + @"\TreeView.xml");

        XmlElement rootElem = doc.DocumentElement;

        XmlNodeList itemlist = rootElem.GetElementsByTagName("node");

        ItemList = new List<Item>();

        foreach (XmlNode xn1 in itemlist)

        {

            XmlElement xe = (XmlElement)xn1;

            XmlNodeList xml = xe.ChildNodes;

            Item item = new Item(xe.GetAttribute("name").ToString(), xml.Item().InnerText, xml.Item().InnerText);

            ItemList.Add(item);

        }

    }

}

using UnityEngine;

using System.Collections;

public class TuBiao : MonoBehaviour

{

    private TreeNode TreeNode;

    dfSprite Sprite;

    NodeMessage Message;

    public bool isShow = false;

    void Start()

    {

        Sprite = this.transform.FindChild("Sprite").GetComponent<dfSprite>();

        TreeNode = this.transform.parent.parent.parent.GetComponent<TreeNode>();

        Message = this.transform.parent.parent.GetComponent<NodeMessage>();

    }

    void OnClick()

    {

        if (Sprite.SpriteName == "ArrowNormal")

            Sprite.SpriteName = "ArrowUnfold";

        else

            Sprite.SpriteName = "ArrowNormal";

        isShow = !isShow;

        TreeNode.tubiaoOnClick(isShow, Message.Tag, Message.NodeList);

    }

}

<?xml version="1.0" encoding="utf-8"?>

<projects>

  <node name="Node1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node1 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node1 - 1 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node1 - 1 - 2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node1 - 2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node1 - 2 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node1 - 2 - 2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node2 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node2 - 2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node2 - 2 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node2 - 2 - 2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node2 - 3">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node3">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node3 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node3 - 1 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node3 - 1 - 2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node3 - 2">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node3 - 2 - 1">

    <id></id>

    <parentid></parentid>

  </node>

  <node name="Node3 - 2 - 2">

    <id></id>

    <parentid></parentid>

  </node>

</projects>