Unity 中的 Sprite 运动故障排除帮助？

Question

我试图让一个对象在 Unity 中每秒移动一次，但它似乎不起作用。我正在尝试制作游戏蛇，我首先将头部的 Sprite 居中，然后每秒将其向右移动，然后添加玩家控件。 有什么帮助让它工作吗？

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

public class Snake_Move : MonoBehaviour
{
    private Vector2 pos;
    private Vector2 moveDirection;
    private float moveTimer;
    private float timerSeconds;

    private void Startup()
    {
        pos = new Vector2(5, 5);
        timerSeconds = 1f;
        moveTimer = timerSeconds;
        moveDirection = new Vector2(1, 0);
    }

    private void Update()
    {
        moveTimer += Time.deltaTime;

        if (moveTimer > timerSeconds)
        {
            pos += moveDirection;
            moveTimer -= timerSeconds;
        }

        transform.position = new Vector2(pos.x, pos.y);
    }
}

Answer 1

Startup 永远不会被调用，因此您的所有值都将保持其默认值 - 特别是 pos = Vector2.zero 和 moveDirection = Vector2.zero，因此您的对象将永远不会移动。

---

您可能更愿意将其称为 Start 以实现自动调用的 Unity 消息 MonoBehaviour.Start

在第一次调用任何 Update 方法之前启用脚本时的帧上。

public class Snake_Move : MonoBehaviour
{
    // These you adjust in the Inspector in Unity
    // Later changes to the values here will have no effect!
    [Tooltip("Time interval between steps in seconds")]
    [SerializeField] private float stepInterval = 1f;

    [Tooltip("Initial position")]
    private Vector2 startPos = new Vector2(5, 5);

    private Vector2 moveDirection;
    private float moveTimer;

    // What you wanted is probably the Unity message method Start
    // which is called when you app starts
    private void Start()
    {
        moveTimer = stepInterval;
        moveDirection = Vector2.right;

        transform.position = startPos;
    }

    private void Update()
    {
        moveTimer += Time.deltaTime;

        if (moveTimer > stepInterval)
        {
            moveTimer -= stepInterval;

            // No need to store the pos, simply only assign a new value
            // to the position when needed
            transform.position += moveDirection;
        }
    }
}