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Assets/Scripts/ImageAspectFill.cs

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+using UnityEngine;
+using UnityEngine.UI;
+using System.Collections;
+
+/// <summary>
+/// 终极等比例版：Image严格按原始比例填满父容器，尺寸正常、无留白、不变形、无报错
+/// </summary>
+[RequireComponent(typeof(Image))]
+[ExecuteInEditMode]
+public class ImageAspectFill : MonoBehaviour
+{
+    [Header("基础配置")]
+    [Tooltip("Canvas的参考分辨率（必须和CanvasScaler一致，如1920x1080）")]
+    public Vector2 canvasReferenceSize = new Vector2(1920, 1080);
+    [Tooltip("最大缩放倍数（防止过度放大模糊）")]
+    public float maxScale = 10f;
+
+    [Header("调试开关")]
+    public bool showLog = false;
+
+    private Image targetImage;
+    private RectTransform imageRect;
+    private RectTransform parentRect;
+    private CanvasScaler canvasScaler;
+
+    private float originalAspectRatio; // Sprite原始宽高比（全程锁定）
+    private float canvasScaleFactor;    // 统一的Canvas缩放因子（宽高共用）
+    private float baseUIWidth;          // 基准UI宽度（按比例推导高度）
+    private float lastScreenSizeW = 0;
+    private float lastScreenSizeH = 0;
+    void Start()
+    {
+        lastScreenSizeW = Screen.width;
+        lastScreenSizeH = Screen.height;
+
+        StartCoroutine(DelayedInit());
+    }
+
+    void OnEnable()
+    {
+        if (targetImage != null)
+        {
+            FitToParentProportionally();
+        }
+        else
+        {
+            StartCoroutine(DelayedInit());
+        }
+    }
+
+    void OnRectTransformDimensionsChange()
+    {
+        if (targetImage != null)
+        {
+            FitToParentProportionally();
+        }
+    }
+
+    private void Update()
+    {
+        // 检测Game视图窗口尺寸变化（编辑器下）
+        if (lastScreenSizeW != Screen.width || lastScreenSizeH != Screen.height)
+        {
+            lastScreenSizeW = Screen.width;
+            lastScreenSizeH = Screen.height;
+            if (showLog)
+            {
+                Debug.Log($"[编辑器窗口变化] 尺寸变为 {lastScreenSizeW}x{lastScreenSizeH}，重新适配Image", this);
+            }
+            FitToParentProportionally();
+        }
+    }
+
+    /// <summary>
+    /// 延迟初始化：锁定原始比例+统一缩放因子
+    /// </summary>
+    private IEnumerator DelayedInit()
+    {
+        yield return null; // 等待Canvas布局完成
+
+        // 初始化组件
+        targetImage = GetComponent<Image>();
+        imageRect = GetComponent<RectTransform>();
+        parentRect = transform.parent.GetComponent<RectTransform>();
+        canvasScaler = GetComponentInParent<CanvasScaler>();
+
+        // 强制锚点居中（等比例缩放的前提）
+        imageRect.anchorMin = imageRect.anchorMax = imageRect.pivot = new Vector2(0.5f, 0.5f);
+        //imageRect.anchoredPosition = Vector2.zero;
+
+        // 1. 锁定Sprite原始宽高比（核心：全程不变）
+        if (targetImage.sprite != null && targetImage.sprite.texture != null)
+        {
+            float spriteW = targetImage.sprite.texture.width;
+            float spriteH = targetImage.sprite.texture.height;
+            originalAspectRatio = spriteW / spriteH;
+            // 基准UI宽度：取Sprite像素转换为UI单位的宽度（统一缩放因子）
+            baseUIWidth = spriteW / GetUnifiedCanvasScaleFactor();
+        }
+        else
+        {
+            // 无Sprite时用16:9默认比例，基准宽度设为参考分辨率的1/2
+            originalAspectRatio = 16f / 9f;
+            baseUIWidth = canvasReferenceSize.x / 2f;
+        }
+
+        // 兜底：防止比例异常（避免变成正方形）
+        originalAspectRatio = Mathf.Clamp(originalAspectRatio, 0.1f, 10f); // 限制比例在0.1~10之间
+        baseUIWidth = Mathf.Max(baseUIWidth, 50f); // 基准宽度最小50UI单位
+
+        // 2. 初始化Image尺寸（严格按比例）
+        float initHeight = baseUIWidth / originalAspectRatio;
+        imageRect.sizeDelta = new Vector2(baseUIWidth, initHeight);
+
+        if (showLog)
+        {
+            Debug.Log($"[初始化] 原始比例：{originalAspectRatio:0.00} | 初始UI尺寸：{baseUIWidth}x{initHeight}", this);
+        }
+
+        // 执行适配
+        FitToParentProportionally();
+    }
+
+    /// <summary>
+    /// 核心逻辑：严格按原始比例缩放，填满父容器
+    /// </summary>
+    private void FitToParentProportionally()
+    {
+        if (parentRect == null || targetImage == null) return;
+
+        // 1. 获取父容器的UI尺寸（纯UI单位，无缩放）
+        Vector2 parentUISize = parentRect.rect.size;
+        float parentW = Mathf.Max(parentUISize.x, 50f);
+        float parentH = Mathf.Max(parentUISize.y, 50f);
+
+        // 2. 计算两个方向的缩放系数（严格按原始比例）
+        // 按宽度填满需要的缩放：父宽 / 基准UI宽
+        float scaleForWidth = parentW / baseUIWidth;
+        // 按高度填满需要的缩放：父高 / (基准UI宽 / 原始比例) → 等价于 父高×原始比例 / 基准UI宽
+        float scaleForHeight = (parentH * originalAspectRatio) / baseUIWidth;
+
+        // 3. 取最大值（填满父容器）+ 限制最大缩放
+        float finalScale = Mathf.Min(Mathf.Max(scaleForWidth, scaleForHeight), maxScale);
+
+        // 安全校验
+        if (float.IsInfinity(finalScale) || float.IsNaN(finalScale))
+        {
+            finalScale = 1f;
+            Debug.LogWarning($"缩放系数异常，兜底为1倍", this);
+        }
+
+        // 4. 应用缩放（仅改缩放，尺寸不变，比例绝对锁定）
+        imageRect.localScale = new Vector3(finalScale, finalScale, 1f);
+
+        // 调试：验证最终比例
+        float finalW = baseUIWidth * finalScale;
+        float finalH = finalW / originalAspectRatio;
+        if (showLog)
+        {
+            Debug.Log($"[适配] 缩放系数：{finalScale:0.00} | 最终尺寸：{finalW:0.00}x{finalH:0.00} | 最终比例：{finalW / finalH:0.00}（原始：{originalAspectRatio:0.00}）", this);
+        }
+    }
+
+    /// <summary>
+    /// 获取统一的Canvas缩放因子（宽高共用，不破坏比例）
+    /// </summary>
+    private float GetUnifiedCanvasScaleFactor()
+    {
+        if (canvasScaler == null) return 1f;
+
+        // 适配CanvasScaler的三种模式，全程返回单一缩放因子
+        switch (canvasScaler.uiScaleMode)
+        {
+            case CanvasScaler.ScaleMode.ConstantPixelSize:
+                return canvasScaler.scaleFactor;
+            case CanvasScaler.ScaleMode.ScaleWithScreenSize:
+                // 统一缩放因子：按最短边匹配参考分辨率
+                float scaleX = (float)Screen.width / canvasReferenceSize.x;
+                float scaleY = (float)Screen.height / canvasReferenceSize.y;
+                return canvasScaler.screenMatchMode == CanvasScaler.ScreenMatchMode.MatchWidthOrHeight
+                    ? Mathf.Lerp(scaleX, scaleY, canvasScaler.matchWidthOrHeight)
+                    : Mathf.Min(scaleX, scaleY); // 按最短边缩放，统一因子
+            case CanvasScaler.ScaleMode.ConstantPhysicalSize:
+                return canvasScaler.scaleFactor;
+            default:
+                return 1f;
+        }
+    }
+
+    /// <summary>
+    /// 手动刷新（更换Sprite后调用）
+    /// </summary>
+    public void RefreshFit()
+    {
+        StartCoroutine(DelayedInit());
+    }
+
+    /// <summary>
+    /// 编辑器预览：在Scene视图中也能看到效果
+    /// </summary>
+    private void OnDrawGizmos()
+    {
+        if (imageRect != null && showLog)
+        {
+            Gizmos.color = Color.green;
+            Gizmos.DrawWireCube(imageRect.position, imageRect.sizeDelta * imageRect.localScale);
+        }
+    }
+}

Assets/Scripts/ImageAspectFill.cs.meta

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Assets/Scripts/ScrollingBackground.cs

@@ -0,0 +1,134 @@
+using UnityEngine;
+using UnityEngine.UI;
+
+/// <summary>
+/// 挂载在Canvas上，控制两个背景Image从上往下无限滚动（适配实际屏幕高度间隔）
+/// </summary>
+[RequireComponent(typeof(Canvas))]
+//[ExecuteInEditMode]
+public class BackgroundScroll : MonoBehaviour
+{
+    [Header("滚动速度（像素/秒）")]
+    public float scrollSpeed = 50f;
+
+    [Header("是否自动获取子物体的两个Image（取消则手动指定）")]
+    public bool autoGetImages = true;
+
+    [Header("手动指定的两个背景Image（autoGetImages为false时生效）")]
+    public Image bgImage1;
+    public Image bgImage2;
+
+    // Image的RectTransform组件
+    private RectTransform rt1;
+    private RectTransform rt2;
+    // Image在屏幕上的实际显示高度（关键：适配Aspect缩放）
+    private float actualImageHeight;
+    private float rt1ScaleY = 1;
+    void Start()
+    {
+    }
+
+    private void OnEnable()
+    {
+        // 初始化Image和RectTransform
+        InitImages();
+
+        // 计算Image的实际屏幕高度（适配Aspect模式）
+        if (rt1 != null)
+        {
+            actualImageHeight = GetImageActualHeight(rt1);
+            rt1ScaleY = rt1.localScale.y;
+            // 初始化第二个Image的位置：在第一个Image顶部上方，间隔实际屏幕高度
+            rt2.anchoredPosition = new Vector2(0, rt1.anchoredPosition.y + actualImageHeight);
+            //Debug.Log($"图片实际屏幕高度：{actualImageHeight}，已初始化第二张图位置");
+        }
+        else
+        {
+            Debug.LogError("未找到有效的背景Image，请检查Canvas下的子物体或手动指定Image！");
+        }
+    }
+
+    void Update()
+    {
+        if (rt1 == null || rt2 == null) return;
+
+
+        if (rt1ScaleY != rt1.localScale.y)
+        {
+            actualImageHeight = GetImageActualHeight(rt1);
+            rt2.anchoredPosition = new Vector2(0, rt1.anchoredPosition.y + actualImageHeight);
+            rt1ScaleY = rt1.localScale.y;
+        }
+
+        // 让两个Image向下滚动（anchoredPosition的y轴减小）
+        rt1.anchoredPosition -= new Vector2(0, scrollSpeed * Time.deltaTime);
+        rt2.anchoredPosition -= new Vector2(0, scrollSpeed * Time.deltaTime);
+
+        // 检测第一个Image是否完全滚出屏幕下方，重置位置（用实际高度判断）
+        if (rt1.anchoredPosition.y <= -actualImageHeight)
+        {
+            rt1.anchoredPosition = new Vector2(0, rt2.anchoredPosition.y + actualImageHeight);
+        }
+
+        // 检测第二个Image是否完全滚出屏幕下方，重置位置（用实际高度判断）
+        if (rt2.anchoredPosition.y <= -actualImageHeight)
+        {
+            rt2.anchoredPosition = new Vector2(0, rt1.anchoredPosition.y + actualImageHeight);
+        }
+    }
+
+    /// <summary>
+    /// 初始化Image组件和RectTransform
+    /// </summary>
+    private void InitImages()
+    {
+        if (autoGetImages)
+        {
+            Image[] images = GetComponentsInChildren<Image>();
+            if (images.Length >= 2)
+            {
+                bgImage1 = images[0];
+                bgImage2 = images[1];
+            }
+            else
+            {
+                Debug.LogError("Canvas下的Image数量不足2个，请检查！");
+                return;
+            }
+        }
+
+        if (bgImage1 != null) rt1 = bgImage1.GetComponent<RectTransform>();
+        if (bgImage2 != null) rt2 = bgImage2.GetComponent<RectTransform>();
+    }
+
+    /// <summary>
+    /// 计算RectTransform在屏幕上的实际显示高度（适配Aspect缩放）
+    /// </summary>
+    /// <param name="rt">目标RectTransform</param>
+    /// <returns>实际屏幕高度（像素）</returns>
+    private float GetImageActualHeight(RectTransform rt)
+    {
+        // 获取RectTransform的世界空间包围盒
+        //Bounds bounds = RectTransformUtility.CalculateRelativeRectTransformBounds(transform, rt);
+        // 转换为屏幕空间的高度（考虑Canvas的缩放）
+        //float canvasScale = GetComponent<Canvas>().scaleFactor;
+        return rt.sizeDelta.y * rt.localScale.y;
+    }
+
+    /// <summary>
+    /// 编辑器下实时预览（可选）
+    /// </summary>
+    private void OnDrawGizmos()
+    {
+        if (Application.isPlaying) return;
+        InitImages();
+        if (rt1 != null)
+        {
+            actualImageHeight = GetImageActualHeight(rt1);
+            if (rt2 != null)
+            {
+                rt2.anchoredPosition = new Vector2(0, actualImageHeight);
+            }
+        }
+    }
+}

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