Unity3D实现页面的滑动切换功能
效果展示
Unity3D实现页面的滑动切换 效果
文章目录
- 前言
- 一、先上代码
- 二、创建UI
-
- 1.创建Scroll View如下图，并挂载该脚本：
- 2.Content下创建几个Itme
- 总结
前言
``
好记性不如烂笔头！
一、先上代码
/**********************************************************************
文件信息
文件名(File Name): PageView.cs
作者(Author): TianWenQuan
创建时间(CreateTime): #CREATETIME#
**********************************************************************/
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
namespace Twq
{
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
using UnityEngine.Events;
using System.Reflection;
//using RenderHeads.Media.AVProVideo.Demos;
//using RenderHeads.Media.AVProVideo;
///
/// 滑动页面效果
///
public class PageView : MonoBehaviour, IBeginDragHandler, IEndDragHandler
{
public static PageView pageViewIn;
private ScrollRect rect;
private float targethorizontal = 0;
private List posList = new List();//存四张图片的位置(0, 0.333, 0.666, 1)
private bool isDrag = true;
private float startTime = 0;
private float startDragHorizontal;
private int curIndex = 0;
public float speed = 2; //滑动速度
public float sensitivity = 0;
public Text curPage;
public Transform Content;
// public GameObject MediaPlayerUI_;
//public MediaPlayer MediaPlayer_;
public Transform PageList;//页面List
public Button LeftButton;
public Button RightButton;
void Awake()
{
pageViewIn = this;
LeftButton.onClick.AddListener(OnLeftButton);
RightButton.onClick.AddListener(OnRightButton);
for (int i = 0; i < PageList.childCount; i++)
{
int x = i;
PageList.GetChild(x).transform.GetComponent().onValueChanged.AddListener((b) => {
if (b)
{
pageTo(x);
}
});
}
rect = GetComponent();
Debug.Log("rect.content.rect.width="+ rect.content.rect.width);
Debug.Log(" GetComponent().rect.width=" + GetComponent().rect.width);
float horizontalLength = rect.content.rect.width - GetComponent().rect.width;
Debug.Log(horizontalLength);
var _rectWidth = GetComponent().rect.width;
Debug.Log(_rectWidth);
Debug.Log(rect.content.transform.childCount);
for (int i = 0; i < rect.content.transform.childCount; i++)
{
Debug.Log("---"+ (_rectWidth * i / horizontalLength).ToString());
posList.Add(_rectWidth * i / horizontalLength); //存四张图片的位置
}
curIndex = 0;
curPage.text = String.Format("当前页码：0");
Content.parent.parent.GetComponent().normalizedPosition = new Vector2(0, 1);
LayoutRebuilder.ForceRebuildLayoutImmediate(Content.GetComponent());
}
void Update()
{
if (!isDrag)
{
startTime += Time.deltaTime;
float t = startTime * speed;
//加速滑动效果
rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, targethorizontal, t);
//缓慢匀速滑动效果
// rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, targethorizontal, Time.deltaTime * speed);
}
}
///
/// 开始拖拽
///
///
public void OnBeginDrag(PointerEventData eventData)
{
Debug.Log("----开始拖动");
isDrag = true;
//开始拖动
startDragHorizontal = rect.horizontalNormalizedPosition; //horizontalNormalizedPosition这个参数是scrollRect滑动期间变化的x坐标值，在（0， 1）之间
}
///
/// 拖拽结束
///
///
public void OnEndDrag(PointerEventData eventData)
{
Debug.Log("拖动结束");
float posX = rect.horizontalNormalizedPosition;
int index = 0;
float offset = Mathf.Abs(posList[index] - posX); //计算当前位置与第一页的偏移量，初始化offect
for (int i = 1; i < posList.Count; i++)
{ //遍历页签，选取当前x位置和每页偏移量最小的那个页面
float temp = Mathf.Abs(posList[i] - posX);
if (temp < offset)
{
index = i;
offset = temp;
}
}
curIndex = index;
targethorizontal = posList[curIndex]; //设置当前坐标，更新函数进行插值
isDrag = false;
startTime = 0;
curPage.text = String.Format("当前页码：{0}", curIndex.ToString());
PageList.GetChild(curIndex + 1).transform.GetComponent().isOn = true;
}
///
/// 左边下一页 按钮
///
public void OnLeftButton()
{
// Debug.Log("curIndex" + curIndex + " posList.Count=" + PageList.childCount);
if (curIndex <= 0)
{
Debug.Log("左边不能点击了");
return;
}
curIndex -= 1;
PageList.GetChild(curIndex).transform.GetComponent().isOn = true;
pageTo(curIndex);
}
///
/// 右边下一页 按钮
///
public void OnRightButton()
{
// Debug.Log("curIndex" + curIndex + " PageList=" + PageList.childCount);
if (curIndex >= PageList.childCount - 1)
{
Debug.Log("右边不能点击了");
return;
}
curIndex += 1;
PageList.GetChild(curIndex).transform.GetComponent().isOn = true;
pageTo(curIndex);
}
///
/// 翻页
///
///
public void pageTo(int index)
{
if (index < 0) { return; }
// Debug.Log("pageTo......index="+ index);
curIndex = index;
targethorizontal = posList[curIndex]; //设置当前坐标，更新函数进行插值
isDrag = false;
startTime = 0;
curPage.text = String.Format("当前页码：{0}", curIndex.ToString());
// MediaPlayer_.Stop();
//MediaPlayerUI_.SetActive(false);
if (index==1)
{
// MediaPlayerUI_.SetActive(true);
}
}
}
}
二、创建UI
1.创建Scroll View如下图，并挂载该脚本：
2.Content下创建几个Itme
对齐方式，可以根据需求使用以下：
!
因为代码里需要使用到Content的宽，让其自动填充宽度。最后删除该组件Content Size Fitte（不删除，可以自己尝试下，会影响我们要的翻动效果）
Content的对齐位置如下：
创建左右按钮和12345翻页按钮，就不仔细写了，都是调用脚本里的方法而已。
总结
好记性不如烂笔头