本文实例为大家分享了Unity实现首字母检索器的具体代码，供大家参考，具体内容如下

需要实现一个类似 “城市选择器”的功能 网上基本都是用原生或者前端来实现功能 其他大概的思路都差不多 这里提供一个Unity 实现的思路

先看一下效果

这里用到了 SuperScrollView 这个插件 来实现功能

ListText.cs // 核心控制类 代码写的比较随意 大概的功能已经实现，需要根据实际需要进行优化。

using SuperScrollView;using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI; public class ListText : MonoBehaviour{ public LoopListView2 mLoopListView; public Text Select_Text; public RectTransform Right_Content; public GameObject Tag_Prefab; public string[] Tags = new string[] { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "#" }; public int TreeViewItemCount { get { return mItemDataList.Count; } } // Start is called before the first frame update void Start() { Init(); Keys.Clear(); for (int i = 0; i < Tags.Length; ++i) { CityData cityData = new CityData(); cityData.Key = Tags[i]; List<string> value = new List<string>(); value.Add("Item" + Tags[i] + Random.Range(0, 6).ToString()); cityData.Value = value; Keys.Add(cityData); } DoRefreshDataSource(); int count = TreeViewItemCount; //tells mTreeItemCountMgr there are how many TreeItems and every TreeItem has how many ChildItems. for (int i = 0; i < count; ++i) { int childCount = GetItemDataByIndex(i).ChildCount; //second param "true" tells mTreeItemCountMgr this TreeItem is in expand status, that is to say all its children are showing. AddTreeItem(childCount, true); } mLoopListView.InitListView(GetTotalItemAndChildCount(), OnGetItemByIndex); } public void AddTreeItem(int count, bool isExpand) { KeyData data = new KeyData(); data.mTreeItemIndex = mTreeItemDataList.Count; data.mChildCount = count; data.mIsExpand = isExpand; mTreeItemDataList.Add(data); mIsDirty = true; } public int GetTotalItemAndChildCount() { int count = mTreeItemDataList.Count; if (count == 0) { return 0; } UpdateAllTreeItemDataIndex(); return mTreeItemDataList[count - 1].mEndIndex + 1; } LoopListViewItem2 OnGetItemByIndex(LoopListView2 listView, int index) { if (index < 0) { return null; } KeyData countData = QueryTreeItemByTotalIndex(index); if (countData == null) { return null; } int treeItemIndex = countData.mTreeItemIndex; ValueData treeViewItemData = GetItemDataByIndex(treeItemIndex); if (countData.IsChild(index) == false)// if is a TreeItem { //get a new TreeItem LoopListViewItem2 item = listView.NewListViewItem("KeyItem"); KeyItem itemScript = item.GetComponent<KeyItem>(); if (item.IsInitHandlerCalled == false) { item.IsInitHandlerCalled = true; itemScript.Init(); //itemScript.SetClickCallBack(this.OnExpandClicked); } //update the TreeItem's content itemScript.mText.text = treeViewItemData.mName; itemScript.SetItemData(treeItemIndex, countData.mIsExpand); return item; } else // if is a TreeChildItem { //childIndex is from 0 to ChildCount. //for example, TreeChildItem0_0 is the 0'th child of TreeItem0 //and TreeChildItem1_2 is the 2'th child of TreeItem1 int childIndex = countData.GetChildIndex(index); ItemData itemData = treeViewItemData.GetChild(childIndex); if (itemData == null) { return null; } //get a new TreeChildItem LoopListViewItem2 item = listView.NewListViewItem("ValueItem"); ValueItem itemScript = item.GetComponent<ValueItem>(); if (item.IsInitHandlerCalled == false) { item.IsInitHandlerCalled = true; itemScript.Init(); } //update the TreeChildItem's content itemScript.SetItemData(itemData, treeItemIndex, childIndex); return item; } } List<ValueData> mItemDataList = new List<ValueData>(); int mTreeViewItemCount = 20; int mTreeViewChildItemCount = 30; // List<string, List<string>> keys = new List<string, List<string>>(); ArrayList Keys = new ArrayList(); void DoRefreshDataSource() { mItemDataList.Clear(); for (int i = 0; i < Keys.Count; i++) { ValueData tData = new ValueData(); CityData city = Keys[i] as CityData; tData.mName = "" + city.Key; mItemDataList.Add(tData); // int childCount = Random.Range(0, 6); for (int j = 0; j < city.Value.Count; j++) { ItemData childItemData = new ItemData(); childItemData.mName = "Item" + city.Value[j] + ":Child" + j; childItemData.mDesc = "Item Desc For " + childItemData.mName; childItemData.mStarCount = Random.Range(0, 6); childItemData.mFileSize = Random.Range(20, 999); tData.AddChild(childItemData); } } //for (int i = 0; i < keys.Count; ++i) //{ // ValueData tData = new ValueData(); // tData.mName = "" + keys[] // mItemDataList.Add(tData); // int childCount = Random.Range(0, 6); //} } public void AddItem() { // string key = Tags[Random.Range(0, Tags.Length)]; // int itemIndex = Random.Range(0, Tags.Length); int itemIndex = 0; CityData cityData = Keys[itemIndex] as CityData; cityData.Value.Add(cityData.Key + "测试"); Keys[itemIndex] = cityData; // int itemIndex = 0; int childIndex = 0; if (childIndex < 0) { childIndex = 0; } KeyData itemCountData = GetTreeItem(itemIndex); if (itemCountData == null) { return; } AddNewItemChildForTest(itemIndex, childIndex); int childCount = itemCountData.mChildCount; SetItemChildCount(itemIndex, childCount + 1); DoRefreshDataSource(); mLoopListView.SetListItemCount(GetTotalItemAndChildCount(), false); mLoopListView.RefreshAllShownItem(); } public void SetItemChildCount(int treeIndex, int count) { if (treeIndex < 0 || treeIndex >= mTreeItemDataList.Count) { return; } mIsDirty = true; KeyData data = mTreeItemDataList[treeIndex]; data.mChildCount = count; } public void AddNewItemChildForTest(int itemIndex, int AddToBeforeChildIndex) { if (itemIndex < 0 || itemIndex >= mItemDataList.Count) { return; } ValueData tData = mItemDataList[itemIndex]; List<ItemData> childItemDataList = tData.mChildItemDataList; ItemData childItemData = new ItemData(); childItemData.mName = "Item" + itemIndex + ":" + AddToBeforeChildIndex; childItemData.mDesc = "Item Desc For " + childItemData.mName; childItemData.mStarCount = Random.Range(0, 6); childItemData.mFileSize = Random.Range(20, 999); if (AddToBeforeChildIndex < 0) { childItemDataList.Insert(0, childItemData); } else if (AddToBeforeChildIndex >= childItemDataList.Count) { childItemDataList.Add(childItemData); } else { childItemDataList.Insert(AddToBeforeChildIndex, childItemData); } } public ValueData GetItemDataByIndex(int index) { if (index < 0 || index >= mItemDataList.Count) { return null; } return mItemDataList[index]; } List<KeyData> mTreeItemDataList = new List<KeyData>(); KeyData mLastQueryResult = null; bool mIsDirty = true; public KeyData QueryTreeItemByTotalIndex(int totalIndex) { if (totalIndex < 0) { return null; } int count = mTreeItemDataList.Count; if (count == 0) { return null; } UpdateAllTreeItemDataIndex(); if (mLastQueryResult != null) { if (mLastQueryResult.mBeginIndex <= totalIndex && mLastQueryResult.mEndIndex >= totalIndex) { return mLastQueryResult; } } int low = 0; int high = count - 1; KeyData data = null; while (low <= high) { int mid = (low + high) / 2; data = mTreeItemDataList[mid]; if (data.mBeginIndex <= totalIndex && data.mEndIndex >= totalIndex) { mLastQueryResult = data; return data; } else if (totalIndex > data.mEndIndex) { low = mid + 1; } else { high = mid - 1; } } return null; } void UpdateAllTreeItemDataIndex() { if (mIsDirty == false) { return; } mLastQueryResult = null; mIsDirty = false; int count = mTreeItemDataList.Count; if (count == 0) { return; } KeyData data0 = mTreeItemDataList[0]; data0.mBeginIndex = 0; data0.mEndIndex = (data0.mIsExpand ? data0.mChildCount : 0); int curEnd = data0.mEndIndex; for (int i = 1; i < count; ++i) { KeyData data = mTreeItemDataList[i]; data.mBeginIndex = curEnd + 1; data.mEndIndex = data.mBeginIndex + (data.mIsExpand ? data.mChildCount : 0); curEnd = data.mEndIndex; } } public KeyData GetTreeItem(int treeIndex) { if (treeIndex < 0 || treeIndex >= mTreeItemDataList.Count) { return null; } return mTreeItemDataList[treeIndex]; } public void OnJumpBtnClicked(int itemIndex) { // int itemIndex = 0; int childIndex = 0; int finalIndex = 0; if (childIndex < 0) { childIndex = 0; } KeyData itemCountData = GetTreeItem(itemIndex); if (itemCountData == null) { return; } int childCount = itemCountData.mChildCount; if (itemCountData.mIsExpand == false || childCount == 0 || childIndex == 0) { finalIndex = itemCountData.mBeginIndex; } else { if (childIndex > childCount) { childIndex = childCount; } if (childIndex < 1) { childIndex = 1; } finalIndex = itemCountData.mBeginIndex + childIndex; } mLoopListView.MovePanelToItemIndex(finalIndex, 0); } public void Init() { int Index = 0; foreach (string Value in Tags) { GameObject go = Instantiate(Tag_Prefab, Right_Content); go.name = "Tag-" + Value; Tag_Item tag_Item = go.GetComponent<Tag_Item>(); tag_Item.Select_Text = Select_Text; tag_Item.Init(Value); tag_Item.Index = Index; tag_Item.KeyStr = Value; tag_Item.listText = this; Index += 1; } } } public class CityData{ public string Key; public List<string> Value;}

这里提供 源码下载 unity版本2019.4.6 低版本也可以打开

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。