unity3d之实现各种滑动效果

一、 点击滑动页面

新建了一个带mask的prefab，加上代码只需要将图片prefab、按钮prefab和所想添加的图片

拖进去会自动生成按钮，滑动速度可以随意调time，滑动效果用itween实现的，所以需要加上itween插件

效果如下：（图片是我最爱的马路小天使（¯﹃¯））

附上代码

using UnityEngine;
using System.Collections.Generic;
using UnityEngine.UI;

public class Mask : MonoBehaviour {

    public List<Sprite> sprite = new List<Sprite>();
    List<GameObject> image=new List<GameObject >();
    public GameObject pic;
    public Button but;
    public float time;
    float width, height;
    int num;
    void Start () 
    {
        num = sprite.Count;
         width = this.gameObject.GetComponent<RectTransform>().rect.width;
         height = this.gameObject.GetComponent<RectTransform>().rect.height;
         pic.transform.GetComponent<RectTransform>().sizeDelta=new Vector2(width,height);
         for (int i = 0; i < num; i++)
         {
             
             GameObject p = Instantiate(pic,new Vector3(transform.position.x+i*width,transform.position.y,0),transform.rotation)as GameObject;
             p.transform.parent = this.gameObject.transform;
             image.Add (p) ;
             p.GetComponent<Image>().sprite = sprite[i];
             Button b = Instantiate(but, new Vector3(transform.position.x- ( 25 * num - 15) / 2+25*i, transform.position.y - height/2 + 15, 0), transform.rotation) as Button;
             b.transform.parent = GameObject.FindWithTag("Button").transform;
             System.Object obj = (System.Object)i;
             b.onClick.AddListener(delegate(){this.MoveToPic((int)obj);});
         }
        

    }
    void OnGUI()
    {
        if (GUI.Button(new Rect(transform.position.x + 20 + width / 2, Screen.height - transform.position.y - 15, 30, 30), ">"))
        {
            if (image[0].transform.position.x < transform.position.x-3)
            {
                Move(1);
            }
        }
        if (GUI.Button(new Rect(transform.position.x -width/2-50,Screen.height- transform.position.y-15 , 30, 30), "<"))
        {
            if (image[num - 1].transform.position.x > transform.position.x+3)
            {
                Move(-1);
            }
        }
    }
    public void Move(int dir)
    {
        for (int i = 0; i <num; i++)
        {
            iTween.MoveAdd(image[i], iTween.Hash("x", width * dir, "time", time));
        }
    }
    public void MoveToPic(int i)
    {
        
        float offset = transform.position.x - image[i].transform.position.x;
        for (int j = 0; j < num; j++)
        {
            iTween.MoveAdd(image[j], iTween.Hash("x", offset, "time", time));
        }
    }

     
}

 二、间隔时间自动滑动，也可点击滑动

using UnityEngine;
using System.Collections.Generic;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using System;

public class ScrollPage : MonoBehaviour, IBeginDragHandler, IEndDragHandler
{
    ScrollRect rect;
    //页面：0，1，2，3  索引从0开始
    //每页占的比列：0/3=0  1/3=0.333  2/3=0.6666 3/3=1
    //float[] pages = { 0f, 0.333f, 0.6666f, 1f };
    List<float> pages = new List<float>();
    int currentPageIndex = -1;

    //滑动速度
    public float smooting = 4;

    //滑动的起始坐标
    float targethorizontal = 0;

    //是否拖拽结束 0 -结束 1-拖拽中 2-结束超过5s
    int isDrag = 2;
    int curindex = 0;
    int dir = 1;
    float timecount = 0;
    /// <summary>
    /// 用于返回一个页码，-1说明page的数据为0
    /// </summary>
    public System.Action<int,int> OnPageChanged;

    float startime = 0f;
    float delay = 0.1f;

    // Use this for initialization
    void Start()
    {
        rect = transform.GetComponent<ScrollRect>();
        //rect.horizontalNormalizedPosition = 0;
        //UpdatePages();      
        startime = Time.time;
    }
    
    void Update()
    {
        if (Time.time < startime + delay) return;
        UpdatePages();
        //如果不判断。当在拖拽的时候要也会执行插值，所以会出现闪烁的效果
        //这里只要在拖动结束的时候。在进行插值
        if (isDrag == 0 && pages.Count > 0)
        {
            rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, targethorizontal, Time.deltaTime * smooting);
            if (Mathf.Abs(rect.horizontalNormalizedPosition - targethorizontal) <= 0.001)
            { isDrag = 2; timecount = 0; }
        }
        if (isDrag == 2)
        {
            timecount += Time.deltaTime;
            if (timecount > 5)
            {
                AutoMove();
                rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, pages[curindex + dir * 1], Time.deltaTime * smooting);
                if (pages == null || OnPageChanged == null)
                    print("Error" + "," + (pages==null) + "," + (OnPageChanged == null));
                OnPageChanged(pages.Count, curindex + dir * 1);
                if (Mathf.Abs(rect.horizontalNormalizedPosition - pages[curindex + dir * 1]) < 0.001)
                {
                    timecount = 0;
                }
            }
        }
    }

    public void AutoMove()
    {
        for (int i = 0; i < pages.Count; i++)
        {
            if (Mathf.Abs(pages[i] - rect.horizontalNormalizedPosition) < 0.001)
            {
                curindex = i;
            }
        }
        if (curindex == pages.Count - 1) { dir = -1; }
        if (curindex == 0) { dir = 1; }
    }
    public void OnBeginDrag(PointerEventData eventData)
    {
        isDrag = 1;

    }
    public  void MoveToPage(int target)
    {
        isDrag = 0;
        targethorizontal = pages [target];
        if(target!=currentPageIndex)
        {
            currentPageIndex = target;
            OnPageChanged(pages.Count, currentPageIndex);
        }
    }
    public void OnEndDrag(PointerEventData eventData)
    {
        isDrag = 0;

        float posX = rect.horizontalNormalizedPosition;
        int index = 0;
        //假设离第一位最近
        float offset = Mathf.Abs(pages[index] - posX);
        for (int i = 1; i < pages.Count; i++)
        {
            float temp = Mathf.Abs(pages[i] - posX);
            if (temp < offset)
            {
                index = i;

                //保存当前的偏移量
                //如果到最后一页。反翻页。所以要保存该值， 
                offset = temp;
            }
        }

        if(index!=currentPageIndex)
        {
            currentPageIndex = index;
            OnPageChanged(pages.Count, currentPageIndex);
        }

        targethorizontal = pages[index];
    }

    void UpdatePages()
    {
        // 获取子对象的数量
        int count = this.rect.content.childCount;
        int temp = 0;
        for(int i=0; i<count; i++)
        {
            if(this.rect.content.GetChild(i).gameObject.activeSelf)
            {
                temp++;
            }
        }
        count = temp;
        
        if (pages.Count!=count)
        {
            if (count != 0)
            {
                pages.Clear();
                for (int i = 0; i < count; i++)
                {
                    float page = 0;
                    if(count!=1)
                        page = i / ((float)(count - 1));
                    pages.Add(page);
                }
            }
            OnEndDrag(null);
        }
    }
}