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还要很多可以优化的点地方，有兴趣的可以做
比如对象的销毁和生成可以做成对象池，走到最左边后再移动到最右边循环利用

分析过程文件，采用Blender，资源已上传，可以播放动画看效果，下面截个图：

视频效果如下：

Untiy结构如下：

上面的ImageItem是我手动添加展示关系用的，默认就一个Target，PictureWall挂PictureWall脚本，ImageItem（预制体）挂ImageItemController 脚本即可

using UnityEngine;public class ImageItemController : MonoBehaviour
{public RectTransform target;public float speed = 10;[SerializeField]private float radiusScale = 1;public float horizontalOffset = 0;private RectTransform rect;private float radius = 0;private Vector2 originalPos = Vector2.zero;private bool isCheck = false;private bool isStartRotate = false;private Vector2 circleCenter;private float xDelta = 0;private float offset = 0;void Start(){rect = transform as RectTransform;rect.anchoredPosition = new Vector2(rect.anchoredPosition.x - horizontalOffset, rect.anchoredPosition.y);radius = target.rect.width * radiusScale;// * Random.Range(0.8f, 1); 半径可以在范围内随机}/* 1.现根据接触点计算出圆的路径：目标移动的位移，计算在圆的的位置，只需修改x即可，y保持不变* 2.计算出的位置x加上移动的距离，得出最总x的位置* 3.设置位置即可* 4.走远时的接触点：开始接触时的关于x对称位置  * 5.添加移动：平移原点和圆点即可*///移动void Update(){if (!isCheck){var dis = Vector2.Distance(target.anchoredPosition, rect.anchoredPosition);if (dis <= radius){isCheck = true;originalPos = rect.anchoredPosition;float y = Mathf.Abs(originalPos.y - target.anchoredPosition.y);float xToCircleCenter = Mathf.Sqrt(radius * radius - y * y);float x = originalPos.x - xToCircleCenter;circleCenter = new Vector2(x, target.anchoredPosition.y);isStartRotate = true;rect.SetSiblingIndex(transform.parent.childCount - 2);}}xDelta = Time.deltaTime * speed;rect.anchoredPosition = new Vector2(rect.anchoredPosition.x - xDelta, rect.anchoredPosition.y);if (isStartRotate){circleCenter.x -= xDelta;originalPos.x -= xDelta;float moveXDistance = target.anchoredPosition.x - circleCenter.x;float x = originalPos.x - circleCenter.x - moveXDistance;float y = Mathf.Sqrt(radius * radius - x * x);float maxY = radius;if (originalPos.y < circleCenter.y){y = -y;maxY = -radius;}Vector2 circlePoint = new Vector2(x, y);if (rect.anchoredPosition.x >= target.anchoredPosition.x){var v1 = circlePoint - (originalPos - circleCenter);var v2 = (originalPos - circleCenter) + new Vector2(0, maxY);v2.Normalize();offset = Vector2.Dot(v1, v2);}else{float tempX = originalPos.x - circleCenter.x;Vector2 originalPos2 = originalPos + 2 * new Vector2(-tempX, 0);var v1 = circlePoint - new Vector2(0, maxY);var v2 = originalPos2 - circleCenter + new Vector2(0, maxY);v2.Normalize();offset = -Vector2.Dot(v1, v2);}if (float.IsNaN(offset)){offset = 0;}x += moveXDistance + offset;Vector2 pos = circleCenter + new Vector2(x, y);rect.anchoredPosition = pos;if (target.anchoredPosition.x >= originalPos.x + originalPos.x - circleCenter.x){rect.anchoredPosition = originalPos;rect.SetAsFirstSibling();}else if (target.anchoredPosition.x <= circleCenter.x){rect.anchoredPosition = originalPos;rect.SetAsFirstSibling();}}if (rect.anchoredPosition.x < -rect.rect.width){Destroy(gameObject);}}
}

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;
using Utility;public class PictureWall : MonoBehaviour
{[SerializeField]private GameObject prefab;private const float WIDTH = 3072;private const float HEIGHT = 1664;private int row = 6;private int column;private float intervalDistance = 20;[SerializeField]private float offset = 200;private float itemWidth;private float itemHeight;public float speed = 10;private float time = 0;[SerializeField]private RectTransform target;private string path = "/PictureWall/";private List<string> texturePaths;private int currentIndex = 0;private List<Texture2D> textureList;void Start(){textureList = new List<Texture2D>();path = Application.streamingAssetsPath + path;ReadImage();CalculateRowColumn();enabled = false;}private void ReadImage(){if (!Directory.Exists(path)){Directory.CreateDirectory(path);return;}texturePaths = new List<string>();var jpgs = Directory.GetFiles(path, "*.jpg");texturePaths.AddRange(jpgs);texturePaths.Reverse();if (texturePaths.Count > 100){for (int i = texturePaths.Count - 1; i == 100; i--){File.Delete(texturePaths[i]);texturePaths.RemoveAt(i);}}foreach (var filePath in texturePaths){UtilityLoadImage.I.LoadImage(filePath, tex =>{textureList.Add(tex);addNum++;if (addNum == texturePaths.Count){Spawn();}});}}float addNum = 0;private void Spawn(){float x = 0;float y = 0;for (int i = 0; i < row; i++){y = i * (itemHeight + intervalDistance);for (int j = 0; j < column; j++){x = j * (itemWidth + intervalDistance);if (i % 2 != 0){//x -= offset;}RectTransform rect = Instantiate(prefab, transform).transform as RectTransform;rect.pivot = new Vector2(0.5f, 0.5f);rect.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, itemWidth);rect.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, itemHeight);rect.anchoredPosition = new Vector2(x, -y) + new Vector2(rect.rect.width / 2, -rect.rect.height / 2);var controller = rect.GetComponent<ImageItemController>();controller.speed = speed;controller.target = target;if (i % 2 != 0){controller.horizontalOffset = offset;}SetTexture(rect);}}target.SetAsLastSibling();  enabled = true;}private void CalculateRowColumn(){itemHeight = (HEIGHT - (row - 1) * intervalDistance) / row;itemWidth = itemHeight * 16 / 9;//offset = itemWidth / 2;column = (int)(WIDTH / (itemWidth + intervalDistance)) + 3;time = itemWidth / speed;}bool isSpawned = false;private void Update(){if (!isSpawned && transform.childCount <= (column - 1) * row + 1){isSpawned = true;SpawnColumn();}}private void SpawnColumn(){float x = 0;float y = 0;for (int i = 0; i < row; i++){y = i * (itemHeight + intervalDistance);for (int j = 0; j < 1; j++){x = (column - 1) * (itemWidth + intervalDistance);RectTransform rect = Instantiate(prefab, transform).transform as RectTransform;rect.pivot = new Vector2(0.5f, 0.5f);rect.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, itemWidth);rect.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, itemHeight);rect.anchoredPosition = new Vector2(x, -y) + new Vector2(intervalDistance - Time.deltaTime * speed, -rect.rect.height / 2);var controller = rect.GetComponent<ImageItemController>();controller.speed = speed;controller.target = target;if (i % 2 != 0){controller.horizontalOffset = offset;}SetTexture(rect);}}target.SetAsLastSibling();StartCoroutine(Delay());}private void SetTexture(RectTransform rect){        rect.GetComponent<RawImage>().texture = textureList[currentIndex];currentIndex = (currentIndex + 1) % texturePaths.Count;}private IEnumerator Delay(){//yield return new WaitForSeconds(0.1f);yield return null;isSpawned = false;}
}

工具类
using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;namespace Utility
{public class UtilityLoadImage{public class MonoHelper : MonoBehaviour { }public static UtilityLoadImage I;private static MonoHelper helper;static UtilityLoadImage(){var go = new GameObject("UtilityLoadImage");helper = go.AddComponent<MonoHelper>();UnityEngine.Object.DontDestroyOnLoad(go);I = new UtilityLoadImage();}private UtilityLoadImage() { }#region  inner methodprivate IEnumerator LoadTexture2D(string path, Action<Texture2D> callback){           //Debug.Log("path:" + path);           UnityWebRequest uwr = UnityWebRequestTexture.GetTexture(path);yield return uwr.SendWebRequest();if (uwr.downloadHandler.isDone){var tex = DownloadHandlerTexture.GetContent(uwr);callback?.Invoke(tex);}}private void LoadTexture2DByFile(string path, Action<Texture2D> callback){if (path.StartsWith("file://")){var bytes = File.ReadAllBytes(path);Texture2D tex = new Texture2D(1, 1);if (tex.LoadImage(bytes))callback?.Invoke(tex);}}private IEnumerator LoadByte(string path, Action<byte[]> callback){UnityWebRequest uwr = UnityWebRequest.Get(path);yield return uwr.SendWebRequest();if (uwr.downloadHandler.isDone){var data = uwr.downloadHandler.data;callback?.Invoke(data);}}private void DeleteFolder(string savedFolder, bool clearSavedPath, bool isRecursive = false){if (!Directory.Exists(savedFolder)){Debug.LogError("要删除的文件夹不存在！");return;}if (clearSavedPath){Directory.Delete(savedFolder, isRecursive);Directory.CreateDirectory(savedFolder);}}private byte[] Texture2DToByte(string path, Texture2D tex){byte[] data = null;int index = path.LastIndexOf('.');if (index != -1){string expandedName = path.Substring(index + 1);switch (expandedName){case "jpeg":case "jpg":data = tex.EncodeToJPG();break;case "png":data = tex.EncodeToPNG();break;default:Debug.Log("");break;}}else{Debug.Log("path is not correct!!!");}return data;}private IEnumerator LoadAudio(string path, string savedFolder, string fileName, Action<AudioClip> callback){UnityWebRequest request = UnityWebRequestMultimedia.GetAudioClip(path, AudioType.MPEG);yield return request.SendWebRequest();if (request.downloadHandler.isDone){File.WriteAllBytes(savedFolder + "/" + fileName, request.downloadHandler.data);AudioClip clip = DownloadHandlerAudioClip.GetContent(request);callback?.Invoke(clip);}}private IEnumerator LoadAudio(string path, string savePath, Action<AudioClip> callback){UnityWebRequest request = UnityWebRequestMultimedia.GetAudioClip(path, AudioType.MPEG);yield return request.SendWebRequest();if (request.downloadHandler.isDone){File.WriteAllBytes(savePath, request.downloadHandler.data);AudioClip clip = DownloadHandlerAudioClip.GetContent(request);callback?.Invoke(clip);}}private IEnumerator LoadAudio(string path, Action<AudioClip> callback){UnityWebRequest request = UnityWebRequestMultimedia.GetAudioClip(path, AudioType.MPEG);yield return request.SendWebRequest();if (request.downloadHandler.isDone){AudioClip clip = DownloadHandlerAudioClip.GetContent(request);if (callback != null)callback(clip);elseDebug.Log("加载音频回调为null");}}#endregion#region load and download imagepublic void LoadImage(string path, Action<Texture2D> callback){helper.StartCoroutine(LoadTexture2D(path, callback));}public void LoadImageByFile(string path, Action<Texture2D> callback){LoadTexture2DByFile(path, callback);}public void LoadImages(string[] paths, Action<List<Texture2D>> callback){Debug.Log("start!!!!!");List<Texture2D> list = new List<Texture2D>();for (int i = 0; i < paths.Length; i++){LoadImage(paths[i], tex => list.Add(tex));}callback?.Invoke(list);Debug.Log("end!!!!!" + list.Count);}public void LoadImagesByFile(string[] paths, Action<List<Texture2D>> callback){List<Texture2D> list = new List<Texture2D>();for (int i = 0; i < paths.Length; i++){var data = File.ReadAllBytes(paths[i]);Texture2D tex = new Texture2D(1, 1);if (tex.LoadImage(data))list.Add(tex);}callback?.Invoke(list);}public void DownloadImageAndSave(string url, string savedFolder, string fileName, Action callback = null){helper.StartCoroutine(LoadTexture2D(url, tex =>{File.WriteAllBytes(savedFolder + "/" + fileName, Texture2DToByte(url, tex));callback?.Invoke();}));}public void DownloadImageAndSave(string url, string savePath, Action callback = null){helper.StartCoroutine(LoadTexture2D(url, tex =>{File.WriteAllBytes(savePath, Texture2DToByte(url, tex));callback?.Invoke();}));}public void DownloadImageAndSave_Texture2D(string url, string savedFolder, string fileName, Action<Texture2D> callback = null){helper.StartCoroutine(LoadTexture2D(url, tex =>{File.WriteAllBytes(savedFolder + "/" + fileName, Texture2DToByte(url, tex));callback?.Invoke(tex);}));}public void DownloadImageAndSave_Texture2D(string url, string savePath, Action<Texture2D> callback = null){helper.StartCoroutine(LoadTexture2D(url, tex =>{File.WriteAllBytes(savePath, Texture2DToByte(url, tex));callback?.Invoke(tex);}));}public void DownloadImageAndSave_FilePath(string url, string savedFolder, string fileName, Action<string> callback = null){helper.StartCoroutine(LoadTexture2D(url, tex =>{string path = savedFolder + "/" + fileName;File.WriteAllBytes(path, Texture2DToByte(url, tex));callback?.Invoke(path);}));}public void DownloadImageAndSave_FilePath(string url, string savePath, Action<string> callback = null){helper.StartCoroutine(LoadTexture2D(url, tex =>{File.WriteAllBytes(savePath, Texture2DToByte(url, tex));callback?.Invoke(savePath);}));}public void DownloadImagesAndSave(string[] urls, string savedFolder, string[] fileNames, Action completedCallback = null, bool deleteFolder = false, bool recursive = false){if (urls.Length != fileNames.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}DeleteFolder(savedFolder, deleteFolder, recursive);int completedNum = 0;for (int i = 0; i < urls.Length; i++){DownloadImageAndSave(urls[i], savedFolder, fileNames[i], () =>{++completedNum;if (completedNum == urls.Length){completedCallback?.Invoke();Debug.Log("所以文件下载完成！");}});}}public void DownloadImagesAndSave_Texture2DPaths(string[] urls, string savedFolder, string[] fileNames, Action<string[]> callback = null, bool deleteFolder = false, bool recursive = false){if (urls.Length != fileNames.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}DeleteFolder(savedFolder, deleteFolder, recursive);int completedNum = 0;string[] filePaths = new string[fileNames.Length];for (int i = 0; i < urls.Length; i++){DownloadImageAndSave_FilePath(urls[i], savedFolder, fileNames[i], path =>{filePaths[completedNum] = path;++completedNum;if (completedNum == urls.Length){callback?.Invoke(filePaths);Debug.Log("所以图片下载完成！");}});}}public void DownloadImagesAndSave_Texture2DPaths(string[] urls, string[] savePaths, Action<string[]> callback = null){if (urls.Length != savePaths.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}int completedNum = 0;string[] filePaths = new string[savePaths.Length];for (int i = 0; i < urls.Length; i++){DownloadImageAndSave_FilePath(urls[i], savePaths[i], path =>{filePaths[completedNum] = path;++completedNum;if (completedNum == urls.Length){callback?.Invoke(filePaths);Debug.Log("所以图片下载完成！");}});}}public void DownloadImagesAndSave_Texture2Ds(string[] urls, string savedFolder, string[] fileNames, Action<Texture2D[]> callback = null, bool deleteFolder = false, bool recursive = false){if (urls.Length != fileNames.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}DeleteFolder(savedFolder, deleteFolder, recursive);int completedNum = 0;Texture2D[] textures = new Texture2D[fileNames.Length];for (int i = 0; i < urls.Length; i++){DownloadImageAndSave_Texture2D(urls[i], savedFolder, fileNames[i], tex =>{textures[completedNum] = tex;++completedNum;if (completedNum == urls.Length){callback?.Invoke(textures);Debug.Log("所以图片下载完成！");}});}}public void DownloadImagesAndSave_Texture2Ds(string[] urls, string[] savePaths, Action<Texture2D[]> callback = null){if (urls.Length != savePaths.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}int completedNum = 0;Texture2D[] textures = new Texture2D[savePaths.Length];for (int i = 0; i < urls.Length; i++){DownloadImageAndSave_Texture2D(urls[i], savePaths[i], tex =>{textures[completedNum] = tex;++completedNum;if (completedNum == urls.Length){callback?.Invoke(textures);Debug.Log("所以图片下载完成！");}});}}#endregion#region download filepublic void DownloadFileAndSave(string url, string savedFolder, string fileName, Action callback = null){helper.StartCoroutine(LoadByte(url, data =>{File.WriteAllBytes(savedFolder + "/" + fileName, data);callback?.Invoke();}));}public void DownloadFileAndSave(string url, string savePath, Action callback = null){helper.StartCoroutine(LoadByte(url, data =>{File.WriteAllBytes(savePath, data);callback?.Invoke();}));}public void DownloadFileAndSave_FilePath(string url, string savedFolder, string fileName, Action<string> callback = null){helper.StartCoroutine(LoadByte(url, data =>{string path = savedFolder + "/" + fileName;File.WriteAllBytes(path, data);callback?.Invoke(path);}));}public void DownloadFileAndSave_FilePath(string url, string savePath, Action<string> callback = null){helper.StartCoroutine(LoadByte(url, data =>{File.WriteAllBytes(savePath, data);callback?.Invoke(savePath);}));}public void DownloadFileAndSave_FileData(string url, string savedFolder, string fileName, Action<byte[]> callback = null){helper.StartCoroutine(LoadByte(url, data =>{string path = savedFolder + "/" + fileName;File.WriteAllBytes(path, data);callback?.Invoke(data);}));}public void DownloadFileAndSave_FileData(string url, string savePath, Action<byte[]> callback = null){helper.StartCoroutine(LoadByte(url, data =>{File.WriteAllBytes(savePath, data);callback?.Invoke(data);}));}public void DownloadFilesAndSave(string[] urls, string savedFolder, string[] fileNames, Action completedCallback = null, bool deleteFolder = false, bool recursive = false){if (urls.Length != fileNames.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}DeleteFolder(savedFolder, deleteFolder, recursive);int completedNum = 0;for (int i = 0; i < urls.Length; i++){DownloadFileAndSave(urls[i], savedFolder, fileNames[i], () =>{++completedNum;if (completedNum == fileNames.Length){completedCallback?.Invoke();}});}}public void DownloadFilesAndSave(string[] urls, string[] savePath, Action callback = null){if (urls.Length != savePath.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}int completedNum = 0;for (int i = 0; i < urls.Length; i++){DownloadFileAndSave(urls[i], savePath[i], () =>{++completedNum;if (completedNum == savePath.Length){callback?.Invoke();}});}}public void DownloadFilesAndSave_FilePaths(string[] urls, string savedFolder, string[] fileNames, Action<string[]> completedCallback = null, bool deleteFolder = false, bool recursive = false){if (urls.Length != fileNames.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}DeleteFolder(savedFolder, deleteFolder, recursive);int completedNum = 0;string[] filePaths = new string[fileNames.Length];for (int i = 0; i < urls.Length; i++){DownloadFileAndSave_FilePath(urls[i], savedFolder, fileNames[i], path =>{filePaths[completedNum] = path;++completedNum;if (completedNum == fileNames.Length){completedCallback?.Invoke(filePaths);}});}}public void DownloadFilesAndSave_FilePaths(string[] urls, string[] savePath, Action<string[]> completedCallback = null){if (urls.Length != savePath.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}int completedNum = 0;string[] filePaths = new string[savePath.Length];for (int i = 0; i < urls.Length; i++){DownloadFileAndSave_FilePath(urls[i], savePath[i], path =>{filePaths[completedNum] = path;++completedNum;if (completedNum == savePath.Length){completedCallback?.Invoke(filePaths);}});}}public void DownloadFilesAndSave_FileDatas(string[] urls, string savedFolder, string[] fileNames, Action<List<byte[]>> completedCallback = null, bool deleteFolder = false, bool recursive = false){if (urls.Length != fileNames.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}DeleteFolder(savedFolder, deleteFolder, recursive);int completedNum = 0;List<byte[]> allDatas = new List<byte[]>(fileNames.Length);for (int i = 0; i < urls.Length; i++){DownloadFileAndSave_FileData(urls[i], savedFolder, fileNames[i], data =>{allDatas.Add(data);++completedNum;if (completedNum == fileNames.Length){completedCallback?.Invoke(allDatas);}});}}public void DownloadFilesAndSave_FileDatas(string[] urls, string[] savePath, Action<List<byte[]>> completedCallback = null){if (urls.Length != savePath.Length){Debug.Log("下载数量和保存的文件数量不一致！");return;}int completedNum = 0;List<byte[]> allDatas = new List<byte[]>(savePath.Length);for (int i = 0; i < urls.Length; i++){DownloadFileAndSave_FileData(urls[i], savePath[i], data =>{allDatas.Add(data);++completedNum;if (completedNum == savePath.Length){completedCallback?.Invoke(allDatas);}});}}#endregion#region download audiopublic void DownloadAudioAndSave_FileData(string url, string savedFolder, string fileName, Action<AudioClip> callback = null){helper.StartCoroutine(LoadAudio(url, savedFolder, fileName, callback));}public void DownloadAudioAndSave_FileData(string url, string savePath, Action<AudioClip> callback = null){helper.StartCoroutine(LoadAudio(url, savePath, callback));}public void LoadAudioClip(string url, Action<AudioClip> callback = null){helper.StartCoroutine(LoadAudio(url, callback));}#endregion}
}