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效果图：
UI子父级关系：
代码中也都有加入注释，有不懂可私信我。脚本中用到了对象池，我没有上传，可根据自己需求做相应变动。
脚本：PageBtnPanelC
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;
///
/// 分页按钮面板控制器
///
public class PageBtnPanelC : MonoBehaviour {
private HorizontalLayoutGroup self_HLG;
///
/// 上一页按钮
///
private Button lastPageBtn;
///
/// 下一页按钮
///
private Button nextPageBtn;
///
/// 页数的父物体
///
private RectTransform pageBtnParent;
private HorizontalLayoutGroup pageBtnParent_HLG;
///
/// 上一页按钮点击事件
///
private UnityAction lastPageBtnEvent;
///
/// 下一页按钮点击事件
///
private UnityAction nextPageBtnEvent;
///
/// 当前显示页面的下标
///
private int _currentShowPageIndex = 1;
public int CurrentShowPageIndex {
get {
return _currentShowPageIndex;
}
set {
_currentShowPageIndex = value;
}
}
///
/// 总的页面数
///
private int totalPageNumber = 0;
///
/// 显示按钮的个数 奇数个
///
[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;
}
}
}
///
/// 页数按钮 预设体
///
public GameObject btnPrefabs;
///
/// 页数按钮 存放list
///
public List 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");
});
}
///
/// 改变显示的状态
///
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();
self_HLG = transform.GetComponent();
pageBtnParent = transform.Find("PageIndexParent") as RectTransform;
pageBtnParent_HLG = pageBtnParent.GetComponent();
lastPageBtn = transform.Find("LastPageBtn").GetComponent();
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();
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);
}
});
}
///
/// 设置信息
///
/// lastBtnEvent,UnityAction nextBtnEvent,UnityAction 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();
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);
}
///
/// 重置所有按钮的状态
///
void ResetPageBtnState() {
for (int i = 0; i < pbcList.Count; i++) {
pbcList[i].SetNormalColor();
}
}
///
/// 回收所有页码
///
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;
}
///
/// 根据index得到pagebtnc物体
///
///
/// 设置物体宽度 子物体宽度相同
///
/// 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);
}
}
///
/// 设置物体宽度 子物体宽度不同
///
/// 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);
}
}
} 脚本：PageBtnC
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;
///
/// 页码按钮控制器
///
public class PageBtnC : MonoBehaviour,IPool {
///
/// 自己显示的页码
///
private int currentPageIndex = 0;
public int CurrentPageIndex {
get {
return currentPageIndex;
}
}
private Button SelfBtn;
private Image img;
private Text selfText;
///
/// 按钮事件
///
public UnityAction btnClickEvent;
///
/// 按钮正常和高亮颜色
///
public Color normalColor;
public Color highlightColor;
///
/// 文本正常和高亮颜色
///
public Color normalTextColor;
public Color highlightTextColor;
private bool isInit = false;
void Init() {
if (isInit)
return;
isInit = true;
img = transform.GetComponent();
selfText = transform.Find("Text").GetComponent();
SelfBtn = transform.GetComponent();
SelfBtn.onClick.AddListener(()=> {
if (btnClickEvent != null) {
btnClickEvent(currentPageIndex,this);
}
});
}
///
/// 设置正常颜色
///
public void SetNormalColor() {
img.color = normalColor;
selfText.color = normalTextColor;
}
///
/// 设置高亮颜色
///
public void SetHighlightColor() {
img.color = highlightColor;
selfText.color = highlightTextColor;
}
///
/// 设置事件 文本内容等
///
/// 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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