unity如何实现翻页按钮功能

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.Events; using UnityEngine.UI; /// <summary> /// 分页按钮面板控制器 /// </summary> public class PageBtnPanelC : MonoBehaviour { private HorizontalLayoutGroup self_HLG; /// <summary> /// 上一页按钮 /// </summary> private Button lastPageBtn; /// <summary> /// 下一页按钮 /// </summary> private Button nextPageBtn; /// <summary> /// 页数的父物体 /// </summary> private RectTransform pageBtnParent; private HorizontalLayoutGroup pageBtnParent_HLG; /// <summary> /// 上一页按钮点击事件 /// </summary> private UnityAction<int> lastPageBtnEvent; /// <summary> /// 下一页按钮点击事件 /// </summary> private UnityAction<int> nextPageBtnEvent; /// <summary> /// 当前显示页面的下标 /// </summary> private int _currentShowPageIndex = 1; public int CurrentShowPageIndex { get { return _currentShowPageIndex; } set { _currentShowPageIndex = value; } } /// <summary> /// 总的页面数 /// </summary> private int totalPageNumber = 0; /// <summary> /// 显示按钮的个数奇数个 /// </summary> [Header("必须是奇数个，且小于总页数")] private int _showBtnCount = 5; public int ShowBtnCount { get { if (_showBtnCount > totalPageNumber) { _showBtnCount = totalPageNumber; } return _showBtnCount; } set { if (value % 2 == 0) { _showBtnCount = value - 1; } else { _showBtnCount = value; } } } /// <summary> /// 页数按钮预设体 /// </summary> public GameObject btnPrefabs; /// <summary> /// 页数按钮存放list /// </summary> public List<PageBtnC> pbcList; private void Start() { Init(); Set(14, 9, (index1) => { Debug.Log("当前显示第：" + CurrentShowPageIndex + "页"); }, (index2) => { Debug.Log("当前显示第：" + CurrentShowPageIndex + "页"); }, (_pageIndex, _pbc) => { Debug.Log("当前显示第：" + CurrentShowPageIndex + "页"); }); } /// <summary> /// 改变显示的状态 /// </summary> void ChangeShowState() { int _showBtnCount = ShowBtnCount; /* 判断是否在可更新范围内,如果在更新范围内，则将CurrentShowPageIndex设置为中心位置的按钮 eg:假设总共有10页(totalPageNumber = 10)，显示按钮的个数为7（ShowBtnCount = 7）则应该在 (ShowBtnCount / 2 + 1) = 4 到 totalPageNumber - ShowBtnCount / 2 = 7 之间设置如果CurrentShowPageIndex = 5或6 则应该这样显示 1.. 3 4 5 6 7 ..10 如果不在更新范围内，如果CurrentShowPageIndex = 1或2或3或4 则应该这样显示： 1 2 3 4 5 6 ..10 如果如果CurrentShowPageIndex = 7或8或9或10 则应该这样显示 1.. 5 6 7 8 9 10 */ if (CurrentShowPageIndex >= (ShowBtnCount / 2 + 1) && CurrentShowPageIndex <= (totalPageNumber - ShowBtnCount / 2)) { int _showBtnCount2 = _showBtnCount - 2; _showBtnCount2 /= 2; //判断起始下标 int startIndex = CurrentShowPageIndex - _showBtnCount2; int endIndex = CurrentShowPageIndex + _showBtnCount2; //防止超出 if (startIndex <= 1) { startIndex = 2; } //防止超出 if (endIndex >= totalPageNumber) { endIndex = totalPageNumber - 1; } //计算中心位置按钮的下标因为showBtnCount不定 int centerIndex = ShowBtnCount / 2; pbcList[centerIndex].Set(CurrentShowPageIndex); //循环设置前面一部分按钮信息 for (int i = 1; i < centerIndex; i++) { pbcList[i].Set(startIndex++); } //循环设置后面一部分按钮信息 for (int i = centerIndex + 1; i < ShowBtnCount - 1; i++) { startIndex++; pbcList[i].Set(startIndex); } } else { //如果点击的是小于等于4的按钮下标 if (CurrentShowPageIndex < (ShowBtnCount / 2 + 1)) { for (int i = 0; i < ShowBtnCount - 1; i++) { pbcList[i].Set(i+1); } }//如果点击的事大于等于7的按钮下标 else if (CurrentShowPageIndex > (totalPageNumber - ShowBtnCount / 2)) { int startNumber = totalPageNumber - ShowBtnCount + 2; for (int i = 1; i < ShowBtnCount; i++) { pbcList[i].Set(startNumber++); } } } /* 判断总显示页数是否大于显示页数以防止出现这种效果：例如：totalPageNumber = 7，ShowBtnCount =7 防止出现的效果：1 2 3 4 5 6 ..7 和 1.. 2 3 4 5 6 7 应该出现的效果：1 2 3 4 5 6 7 */ if (totalPageNumber > ShowBtnCount){ _showBtnCount -= 2; _showBtnCount /= 2; if (CurrentShowPageIndex - _showBtnCount - 1 > 1) { pbcList[0].Set(1, "1.."); } else { pbcList[0].Set(1); } if (CurrentShowPageIndex + _showBtnCount + 1 < totalPageNumber) { pbcList[ShowBtnCount - 1].Set(totalPageNumber, ".." + totalPageNumber); } else { pbcList[ShowBtnCount - 1].Set(totalPageNumber); } } } private bool isInit = false; public void Init() { if (isInit) return; isInit = true; pbcList = new List<PageBtnC>(); self_HLG = transform.GetComponent<HorizontalLayoutGroup>(); pageBtnParent = transform.Find("PageIndexParent") as RectTransform; pageBtnParent_HLG = pageBtnParent.GetComponent<HorizontalLayoutGroup>(); lastPageBtn = transform.Find("LastPageBtn").GetComponent<Button>(); lastPageBtn.onClick.AddListener(()=> { if (totalPageNumber <= 0) return; if (CurrentShowPageIndex > 1) { CurrentShowPageIndex--; } ResetPageBtnState(); ChangeShowState(); PageBtnC pbc = GetPBCFromIndex(CurrentShowPageIndex); if (pbc != null) { pbc.SetHighlightColor(); } if (lastPageBtnEvent != null) { lastPageBtnEvent(CurrentShowPageIndex); } }); nextPageBtn = transform.Find("NextPageBtn").GetComponent<Button>(); nextPageBtn.onClick.AddListener(()=> { if (totalPageNumber <= 0) return; if (CurrentShowPageIndex < totalPageNumber) { CurrentShowPageIndex++; } ResetPageBtnState(); ChangeShowState(); PageBtnC pbc = GetPBCFromIndex(CurrentShowPageIndex); if (pbc != null) { pbc.SetHighlightColor(); } if (nextPageBtnEvent != null) { nextPageBtnEvent(CurrentShowPageIndex); } }); } /// <summary> /// 设置信息 /// </summary> /// <param name="totalPageNumber">总页数</param> /// <param name="showBtnCount">显示多少个按钮，填奇数，如果填偶数，则会强制减1，如：填6，则实际为5</param> /// <param name="lastBtnEvent">上一页按钮事件</param> /// <param name="nextBtnEvent">下一页按钮事件</param> /// <param name="pageBtnClickEvent">单独点击页面按钮事件</param> public void Set(int totalPageNumber,int showBtnCount,UnityAction<int> lastBtnEvent,UnityAction<int> nextBtnEvent,UnityAction<int,PageBtnC> pageBtnClickEvent) { if (totalPageNumber <= 0) { this.totalPageNumber = 1; } else { this.totalPageNumber = totalPageNumber; } this.ShowBtnCount = showBtnCount; this.lastPageBtnEvent = lastBtnEvent; this.nextPageBtnEvent = nextBtnEvent; CurrentShowPageIndex = 1; pbcList.Clear(); for (int i = 1; i <= ShowBtnCount; i++) { int index = i; PageBtnC pbc = PoolManager.Instance.Spawn(btnPrefabs, pageBtnParent).GetComponent<PageBtnC>(); if (pbc) { pbc.Set(index,null, (pageIndex,pbc111) => { CurrentShowPageIndex = pageIndex; ResetPageBtnState(); ChangeShowState(); PageBtnC pbc1 = GetPBCFromIndex(CurrentShowPageIndex); if (pbc1 != null) { pbc1.SetHighlightColor(); } if (pageBtnClickEvent != null) { pageBtnClickEvent(pageIndex, pbc111); } }); } pbcList.Add(pbc); } pbcList[0].SetHighlightColor(); ChangeShowState(); Util.SetWidth_ChildWidthSame(pageBtnParent_HLG, pageBtnParent); Util.SetWidth_ChildWidthNotSame(self_HLG, transform as RectTransform); } /// <summary> /// 重置所有按钮的状态 /// </summary> void ResetPageBtnState() { for (int i = 0; i < pbcList.Count; i++) { pbcList[i].SetNormalColor(); } } /// <summary> /// 回收所有页码 /// </summary> public void Unspawn() { for (int i = pageBtnParent.childCount - 1; i >= 0; i--) { PoolManager.Instance.UnSpawn(pageBtnParent.GetChild(i).gameObject); } } public void Clear() { lastPageBtnEvent = null; nextPageBtnEvent = null; } /// <summary> /// 根据index得到pagebtnc物体 /// </summary> /// <param name="index"></param> /// <returns></returns> PageBtnC GetPBCFromIndex(int index) { for (int i = 0; i < pbcList.Count; i++) { if (pbcList[i].CurrentPageIndex.Equals(index)) { return pbcList[i]; } } return null; } } public class Util { /// <summary> /// 设置物体宽度子物体宽度相同 /// </summary> /// <param name="parentHLG"></param> /// <param name="parent"></param> /// <param name="callback"></param> public static void SetWidth_ChildWidthSame(HorizontalLayoutGroup parentHLG, RectTransform parent, UnityAction<float> endCallBack = null) { float width = 0; float leftPadding = parentHLG.padding.left; float spacing = parentHLG.spacing; int childCount = parent.childCount; if (childCount > 0) { RectTransform singleChildRT = parent.GetChild(0) as RectTransform; width = childCount * singleChildRT.rect.width + (childCount - 1) * spacing + leftPadding; } parent.sizeDelta = new Vector2(width, parent.sizeDelta.y); if (endCallBack != null) { endCallBack(width); } } /// <summary> /// 设置物体宽度子物体宽度不同 /// </summary> /// <param name="parentHLG"></param> /// <param name="parent"></param> /// <param name="callback"></param> public static void SetWidth_ChildWidthNotSame(HorizontalLayoutGroup parentHLG, RectTransform parent, UnityAction<float> endCallBack = null) { float width = 0; RectOffset Padding = parentHLG.padding; float spacing = parentHLG.spacing; int childCount = parent.childCount; if (childCount > 0) { for (int i = 0; i < childCount; i++) { RectTransform childRT = parent.GetChild(i) as RectTransform; width += childRT.rect.width; } width += (childCount - 1) * spacing + Padding.left + Padding.right; } parent.sizeDelta = new Vector2(width, parent.sizeDelta.y); if (endCallBack != null) { endCallBack(width); } } }

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.Events; using UnityEngine.UI; /// <summary> /// 页码按钮控制器 /// </summary> public class PageBtnC : MonoBehaviour,IPool { /// <summary> /// 自己显示的页码 /// </summary> private int currentPageIndex = 0; public int CurrentPageIndex { get { return currentPageIndex; } } private Button SelfBtn; private Image img; private Text selfText; /// <summary> /// 按钮事件 /// </summary> public UnityAction<int,PageBtnC> btnClickEvent; /// <summary> /// 按钮正常和高亮颜色 /// </summary> public Color normalColor; public Color highlightColor; /// <summary> /// 文本正常和高亮颜色 /// </summary> public Color normalTextColor; public Color highlightTextColor; private bool isInit = false; void Init() { if (isInit) return; isInit = true; img = transform.GetComponent<Image>(); selfText = transform.Find("Text").GetComponent<Text>(); SelfBtn = transform.GetComponent<Button>(); SelfBtn.onClick.AddListener(()=> { if (btnClickEvent != null) { btnClickEvent(currentPageIndex,this); } }); } /// <summary> /// 设置正常颜色 /// </summary> public void SetNormalColor() { img.color = normalColor; selfText.color = normalTextColor; } /// <summary> /// 设置高亮颜色 /// </summary> public void SetHighlightColor() { img.color = highlightColor; selfText.color = highlightTextColor; } /// <summary> /// 设置事件文本内容等 /// </summary> /// <param name="currentPageIndex"></param> /// <param name="selfTextStr"></param> /// <param name="btnClickEvent"></param> public void Set(int currentPageIndex,string selfTextStr = null,UnityAction<int,PageBtnC> btnClickEvent = null) { this.currentPageIndex = currentPageIndex; if (btnClickEvent != null) { this.btnClickEvent = btnClickEvent; } if (string.IsNullOrEmpty(selfTextStr)) { selfText.text = currentPageIndex.ToString(); } else { selfText.text = selfTextStr; } } #region 对象池接口方法 public int GetMaxCount() { return 10; } public string SingletonName() { return this.GetType().Name; } public void Spawn() { Init(); } public void UnSpawn() { SetNormalColor(); } #endregion }

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