Unity 角色移动2D动画模块

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(SpriteRenderer))]
public class SpriteAnimator : MonoBehaviour
{
    private SpriteRenderer spriteRenderer;

    [SerializeField]
    private Sprite idleSprite;
    [SerializeField]
    private Sprite[] moveUpSprites;
    [SerializeField]
    private Sprite[] moveDownSprites;
    [SerializeField]
    private Sprite[] moveLeftSprites;
    [SerializeField]
    private Sprite[] moveRightSprites;


    private Vector2 lastDirection;
    [HideInInspector]
    public Vector2 direction;

    private int currentSpriteIndex = 0;
    private float timePlayedForCurrentSpriteFrame;
    [SerializeField]
    private float timeFor1Frame = 0.5f;

    private void Awake()
    {
        spriteRenderer = GetComponent<SpriteRenderer>();
    }


    void Start()
    {
        TypeSingleton.Get<PlayerController>().OnDirectionChanged += SetDirection;
        spriteRenderer.sprite = idleSprite;
    }

    // Update is called once per frame
    void Update()
    {

        if (direction.Equals(Vector2.zero)) PlayIdle();
        else if(direction.Equals(Vector2.up)) PlayMove(moveUpSprites);
        else if(direction.Equals(Vector2.down)) PlayMove(moveDownSprites);
        else if(direction.Equals(Vector2.left)) PlayMove(moveLeftSprites);
        else if (direction.Equals(Vector2.right)) PlayMove(moveRightSprites);

        lastDirection = direction;
    }

    private void PlayMove(Sprite[] spritesList)
    {

        if (timePlayedForCurrentSpriteFrame >= timeFor1Frame)
        {
            timePlayedForCurrentSpriteFrame = 0;

            currentSpriteIndex++;
            if(currentSpriteIndex == spritesList.Length) 
                currentSpriteIndex = 0;
        }

        spriteRenderer.sprite = spritesList[currentSpriteIndex];
        timePlayedForCurrentSpriteFrame += Time.deltaTime;
    }


    private void PlayIdle()
    {
        if (lastDirection.Equals(Vector2.up)) spriteRenderer.sprite = moveUpSprites[0];
        else if (lastDirection.Equals(Vector2.down)) spriteRenderer.sprite = moveDownSprites[0];
        else if (lastDirection.Equals(Vector2.left)) spriteRenderer.sprite = moveLeftSprites[0];
        else if (lastDirection.Equals(Vector2.right)) spriteRenderer.sprite = moveRightSprites[0];

    }


    public void SetDirection(Vector2 direction)
    {
        this.direction = direction;

        if(lastDirection != direction)  
            currentSpriteIndex = 0;
    }


}