视频效果

代码

using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;
using DG.Tweening.Core;
using DG.Tweening.Plugins.Options;

public class JuanZhou : MonoBehaviour
{
    [SerializeField]
    private RawImage rawImage;
    [SerializeField]
    /// <summary>
    /// Padding to be applied to the masking
    /// X = Left
    /// Y = Bottom
    /// Z = Right
    /// W = Top
    /// </summary>
    private RectMask2D rectMask2D;
    [SerializeField]
    private RectTransform Left;
    [SerializeField]
    private RectTransform Right;
    [SerializeField]
    private Vector4 rectMaskTarget;
    [SerializeField]
    private float LeftX;
    [SerializeField]
    private float RightX;
    [SerializeField]
    private float duration = 2;
    [SerializeField]
    private float LeftOriX;
    [SerializeField]
    private float RightOriX;

    private void Update()
    {
        if (Input.GetKeyUp(KeyCode.P))
        {
            Play();
        }
        else if (Input.GetKeyUp(KeyCode.O))
        {
            Close(true);
        }
    }
    /// <summary>
    /// 设置图片
    /// </summary>
    public void SetRawImage(Texture texture)
    {
        rawImage.texture = texture;
    }
    [ContextMenu("开启")]
    public void Play()
    {
        Play(true);
    }
    public void Play(bool Invoke = true)
    {
        float tmp = Invoke ? duration : 0;
        Left.DOAnchorPosX(LeftX, tmp).SetEase(Ease.Linear);
        Right.DOAnchorPosX(RightX, tmp).SetEase(Ease.Linear);
        rectMask2D.DoPadding(Vector4.zero, tmp).SetEase(Ease.Linear);
    }
    [ContextMenu("关闭")]
    public void Close()
    {
        Close(false);
    }
    public void Close(bool Invoke = true)
    {
        float tmp = Invoke ? duration : 0;
        Left.DOAnchorPosX(LeftOriX, tmp).SetEase(Ease.Linear);
        Right.DOAnchorPosX(RightOriX, tmp).SetEase(Ease.Linear);
        rectMask2D.DoPadding(rectMaskTarget, tmp).SetEase(Ease.Linear);
    }

    [ContextMenu("暂停")]
    public void Pause()
    {
        Left.DOPause();
        Right.DOPause();
        rectMask2D.DOPause();
    }


}

public static class RectMask2DExtensions
{
    public static TweenerCore<Vector4, Vector4, VectorOptions> DoPadding(this RectMask2D target, Vector4 endValue, float duration, bool snapping = false)
    {
        TweenerCore<Vector4, Vector4, VectorOptions> t = DOTween.To(() => target.padding, x => target.padding = x, endValue, duration);
        t.SetOptions(snapping).SetTarget(target);
        return t;
    }
}

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卷轴预制体结构