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Src/Unity/Scripts/UX/UGUI/UGUIBackgroundImageScaler.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace BITKit.UX
+{
+
+	/// <summary>
+	/// Created by Vitens on 2020/12/11 20:48:35
+	/// 
+	/// Description : 
+	///      全屏背景图片等比例拉伸自适应
+	/// </summary>
+	[ExecuteInEditMode]
+	public class UGUIBackgroundImageScaler : MonoBehaviour
+	{
+		//图片原大小(压缩前的)
+		[SerializeField] private Vector2 textureOriginSize = new Vector2(2048, 1024);
+
+		// Start is called before the first frame update
+		private void Start()
+		{
+			Scaler();
+		}
+
+		//适配
+		private void Scaler()
+		{
+			//当前画布尺寸
+			Vector2 canvasSize = gameObject.GetComponentInParent<Canvas>().GetComponent<RectTransform>().sizeDelta;
+			//当前画布尺寸长宽比
+			float screenxyRate = canvasSize.x / canvasSize.y;
+
+			//图片尺寸 这个得到的结果是 (0,0) ?
+			//Vector2 bgSize = bg.mainTexture.texelSize;
+			Vector2 bgSize = textureOriginSize;
+			//视频尺寸长宽比
+			float texturexyRate = bgSize.x / bgSize.y;
+
+			RectTransform rt = (RectTransform)transform;
+			//视频x偏长,需要适配y（下面的判断 '>' 改为 '<' 就是视频播放器的视频方式）
+			if (texturexyRate > screenxyRate)
+			{
+				int newSizeY = Mathf.CeilToInt(canvasSize.y);
+				int newSizeX = Mathf.CeilToInt((float)newSizeY / bgSize.y * bgSize.x);
+				rt.sizeDelta = new Vector2(newSizeX, newSizeY);
+			}
+			else
+			{
+				int newVideoSizeX = Mathf.CeilToInt(canvasSize.x);
+				int newVideoSizeY = Mathf.CeilToInt((float)newVideoSizeX / bgSize.x * bgSize.y);
+				rt.sizeDelta = new Vector2(newVideoSizeX, newVideoSizeY);
+			}
+		}
+
+		private void Update()
+		{
+#if UNITY_EDITOR
+			//editor模式下测试用
+			Scaler();
+#endif
+		}
+
+	}
+}

Src/Unity/Scripts/UX/UGUI/UGUIBackgroundImageScaler.cs.meta

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