[Unity] Easy image cinematic

ImageCinematic.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ImageCinematic : MonoBehaviour
{
	[System.Serializable]
	private struct CinematicStep
	{
		public float seconds;
		public Sprite sprite;
	}

	#region inspector properties
	[SerializeField]
	private bool autoDestroy = true;
	[SerializeField]
	private Image imageA;
	[SerializeField]
	private Image imageB;
	[SerializeField]
	private CinematicStep[] cinematicSteps;
	[SerializeField]
	private float fadeOutSeconds = 0.7f;
	#endregion

	private bool finished = false;
	private int nextCinematicStep = 0;
	private float secondsForNextStep = -1;


	public bool Finished { get { return finished; } }


	public void Next()
	{
		var numSteps = cinematicSteps.Length;

		if (nextCinematicStep < numSteps)
		{
			var step = cinematicSteps[nextCinematicStep];
			nextCinematicStep += 1;

			imageB.sprite = imageA.sprite;
			imageB.color = imageA.color;
			imageA.sprite = step.sprite;
			imageA.color = new Color(1f, 1f, 1f, 0f);
			secondsForNextStep = step.seconds;
		}
		else
		{
			finished = true;
			if (autoDestroy)
				StartCoroutine(AnimateDestroy());
		}
	}
	
	public void ForceFinish()
	{
		finished = true;
		StartCoroutine(AnimateDestroy());
	}


	void Start()
	{
		Next();
	}
	
	void Update()
	{
		if (secondsForNextStep >= 0)
		{
			secondsForNextStep -= Time.deltaTime;
			if (secondsForNextStep < 0)
				Next();
		}

		var maxDelta = (1f / fadeOutSeconds) * Time.deltaTime;
		ImageMoveAlphaTowards(imageA, 1f, maxDelta);
		ImageMoveAlphaTowards(imageB, 0f, maxDelta);
		imageB.enabled = !Mathf.Approximately(imageB.color.a, 0f);
	}

	IEnumerator AnimateDestroy()
	{
		secondsForNextStep = -1;
		enabled = false;

		var t = 0f;
		var secondsElapsed = 0f;

		var transparent = new Color(1f, 1f, 1f, 0f);
		while (t < 1)
		{
			t = secondsElapsed / fadeOutSeconds;
			secondsElapsed += Time.deltaTime;
			var colorA = Color.Lerp(imageA.color, transparent, t);
			var colorB = Color.Lerp(imageB.color, transparent, t);
			imageA.color = colorA;
			imageB.color = colorB;
			yield return null;
		}

		Destroy(gameObject);
	}


	private void ImageMoveAlphaTowards(Image image, float target, float maxDelta)
	{
		var imageAlpha = Mathf.MoveTowards(image.color.a, target, maxDelta);
		var imageColor = image.color;
		imageColor.a = imageAlpha;
		image.color = imageColor;
	}
}