上代码：

using UnityEngine;[RequireComponent(typeof(Camera))]
public class SpriteAdapter : MonoBehaviour {[System.Serializable]public class SpriteInfo{public SpriteRenderer Value = null;public EFillModel Model = EFillModel.ShowAll;}public enum EFillModel{/// <summary>/// 显示图片的所有内容/// </summary>ShowAll,/// <summary>/// 使图片内容填满屏幕/// </summary>Full,/// <summary>/// 根据图片高度填充屏幕/// </summary>WithHeight,/// <summary>/// 根据图片宽度填充屏幕/// </summary>WithWidth}public enum EUpdateType{/// <summary>/// 只在唤醒时更新一次/// </summary>UpdateOnAwake,/// <summary>/// 再每次视口发生变化的时候更新一次/// </summary>UpdateOnViewportChanged}public EUpdateType TickType = EUpdateType.UpdateOnAwake;public SpriteInfo[] Members;Camera Viewport;float ScreenRatio;void Awake () {Viewport = GetComponent<Camera>();UpdateAll();}private void LateUpdate(){if (TickType != EUpdateType.UpdateOnViewportChanged) return;if (ScreenRatio != Viewport.aspect){UpdateAll();}} /// <summary>/// 更新所有应用屏幕适配的图片/// </summary>void UpdateAll(){for (int i = 0; i < Members.Length; i++){AdaptSpriteRender(Members[i]);}ScreenRatio = Viewport.aspect;}/// <summary>/// 使sprite铺满整个屏幕/// </summary>private void AdaptSpriteRender(SpriteInfo _spriteInfo){SpriteRenderer spriteRenderer = _spriteInfo.Value;Vector3 scale = spriteRenderer.transform.localScale;float cameraheight = Viewport.orthographicSize * 2;float camerawidth = cameraheight * Viewport.aspect;float texr = (float)spriteRenderer.sprite.texture.width / spriteRenderer.sprite.texture.height;float viewr = camerawidth / cameraheight;switch (_spriteInfo.Model){case EFillModel.WithHeight://> 根据图片高度进行填充scale *= cameraheight / spriteRenderer.bounds.size.y;break;case EFillModel.WithWidth://> 根据图片宽度进行填充scale *= camerawidth / spriteRenderer.bounds.size.x;break;case EFillModel.Full: //> 填满整个屏幕if (viewr >= texr){if(viewr >= 1 && texr >= 1 || texr < 1)scale *= camerawidth / spriteRenderer.bounds.size.x;elsescale *= cameraheight / spriteRenderer.bounds.size.y;}else{if (viewr <= 1 || texr > 1)scale *= cameraheight / spriteRenderer.bounds.size.y; elsescale *= camerawidth / spriteRenderer.bounds.size.x;}break;default://> 在屏幕上显示图片的全部内容if (viewr >= texr){scale *= cameraheight / spriteRenderer.bounds.size.y;}else{scale *= camerawidth / spriteRenderer.bounds.size.x;}break;}spriteRenderer.transform.localScale = scale; } 
}

如何使用：

1.把脚本挂在Camera上

2.把需要进行屏幕适配的SpriteRender对象放在Member队列中

3.选择更新类型EUpdateType、选择适配类型EFillModel即可