Unity 制作图片轮播功能

以你之姓@ 2022-05-08 05:52 1038阅读 0赞

功能：自动播放移动 首尾相接  鼠标移到图片上 时 移动停止并 该图片变大  鼠标离开图片恢复原形 轮播效果继续

效果如下

![70][]

界面布局 大体是这个样子

scrollView就是一个底板带Image组件

Viewport负责遮罩带Mask组件

然后content前期布局使用了Group组件 不过项目需求图片尺寸要变化 所以之后关闭

子类Image是一张张图片

![70 1][]

初版轮播 上代码

这一步是 两个底板 首尾相连 update里一起运动 检测到达目标点 更换到尾部位置 初步轮播效果实现

下一步 上代码（完整版）

using UnityEngine;
    using System.Collections;
    using UnityEngine.EventSystems;
    using UnityEngine.Events;
    using System.Collections.Generic;
    
    /**
     *两个背景图片平移 
     */
    public class BackgroundController : MonoBehaviour
    {
        public GameObject back1;
        public GameObject back2;
        public int speed = 1;                       //背景平移的速度
        public Transform endPosition;       //到达该位置,把背景移动到开始位置
        public Transform startPosition;      //背景从开始位置移动到结束位置
    
        private GameObject[] ContentChilders = new GameObject[14];
        void Start()
        {
            //进入检测添加
            UnityAction<BaseEventData> click = new UnityAction<BaseEventData>(OnPointerEnter);
            EventTrigger.Entry myclick = new EventTrigger.Entry();
            myclick.eventID = EventTriggerType.PointerEnter;
            myclick.callback.AddListener(click);
            //移出检测添加
            UnityAction<BaseEventData> click1 = new UnityAction<BaseEventData>(OnPointerExit);
            EventTrigger.Entry myclick1 = new EventTrigger.Entry();
            myclick1.eventID = EventTriggerType.PointerExit;
            myclick1.callback.AddListener(click1);
            int i = 0;
            foreach (Transform childer in back1.transform)
            {
                ContentChilders[i] = childer.gameObject;
                EventTrigger trigger = ContentChilders[i].AddComponent<EventTrigger>();
                trigger.triggers.Add(myclick);
                trigger.triggers.Add(myclick1);
                i++;
            }
            foreach (Transform childer in back2.transform)
            {
                ContentChilders[i] = childer.gameObject;
                EventTrigger trigger = ContentChilders[i].AddComponent<EventTrigger>();
                trigger.triggers.Add(myclick);
                trigger.triggers.Add(myclick1);
                i++;
            }
        }
        private RectTransform selObject;
        private void OnPointerEnter(BaseEventData arg0)
        {
            isMove = false;
            PointerEventData P_EveDat = arg0 as PointerEventData;
            selObject = P_EveDat.pointerCurrentRaycast.gameObject.transform as RectTransform;
            selObject.sizeDelta = new Vector2(200, 200);
        }
    
        private void OnPointerExit(BaseEventData arg0)
        {
            isMove = true;
            selObject.sizeDelta = new Vector2(160, 160);
        }
    
        //是否移动
        private bool isMove = true;
        void Update()
        {
            if (isMove == true)
            {
                //两个图片的平移
                back1.transform.position = new Vector3(back1.transform.position.x - speed * Time.deltaTime, back1.transform.position.y, back1.transform.position.z);
                back2.transform.position = new Vector3(back2.transform.position.x - speed * Time.deltaTime, back2.transform.position.y, back2.transform.position.z);
                //到达结束位置,回到开始位置,切换图片
                if (back1.transform.position.x <= endPosition.transform.position.x)
                {
                    back1.transform.position = startPosition.transform.position;
                }
                if (back2.transform.position.x <= endPosition.transform.position.x)
                {
                    back2.transform.position = startPosition.transform.position;
                }
            }
        }
    }

首先 foreach 获取两个组里的所有图片子类  然后给图片子类添加事件监听

EventTriggerType.PointerExit;鼠标移出的监听  对应 OnPointerEnter当鼠标进入图片的相应事件

EventTriggerType.PointerEnter 鼠标进入图片的监听

当鼠标进入图片进行 处理  停止轮播效果-->获取当前图片的尺寸-->进行尺寸放大

isMove = false;//停止轮播效果  
        PointerEventData P\_EveDat = arg0 as PointerEventData;  
        selObject = P\_EveDat.pointerCurrentRaycast.gameObject.transform as RectTransform;  
        selObject.sizeDelta = new Vector2(200, 200);

同理 鼠标移出图片进行 处理  开始轮播效果-->获取当前图片的尺寸-->进行尺寸还原

//demo地址

链接：https://pan.baidu.com/s/1hD\_FcARkoetWMFq-Cqrqsg 密码：9a2m

[70]: /images/20220508/22ef38b23cc74b63820b8b8f7b42fbd2.png
[70 1]: /images/20220508/3b9aa8ceacf549b285d37f5a7505ce74.png