c# - 2d 平台游戏敌人运动

Question

我已经研究了至少两个小时，关于如何制作一个在平台上左右移动而不会掉落的敌人角色。我已经尝试了 4 个不同的脚本并浏览了 2 个 youtube 教程，但我似乎在所有方面都遇到了错误。这是我的第一篇文章，所以如果我做错了什么请通知我，谢谢 :)。

我的代码如下:

using UnityEngine;
using System.Collections;

public class EnemyPatrol : MonoBehaviour {

    public float MoveSpeed;
    public bool MoveRight;
    public var velocity: Vector2;

    void Update () 
    {
        if (MoveRight) {
            public bool GetComponent<rigidbody2D>().velocity = 
              new Vector2(MoveSpeed, rigidbody2D.velocity.y);
        } else {
            public bool GetComponent<rigidbody2D>().velocity = 
              new Vector2(-MoveSpeed, rigidbody2D.velocity.y);
        }
    }
}

我的错误:

Assets/Scripts/EnemyPatrol.cs(8,28): error CS1519: Unexpected symbol \`:' in class, struct, or interface member declaration  
Assets/Scripts/EnemyPatrol.cs(8,37): error CS1519: Unexpected symbol \`;' in class, struct, or interface member declaration  
Assets/Scripts/EnemyPatrol.cs(13,30): error CS1525: Unexpected symbol \`public'  
Assets/Scripts/EnemyPatrol.cs(15,30): error CS1525: Unexpected symbol \`public'

Answer 1

这是一个非常简单的解决方案，可以帮助您入门。

using UnityEngine;
using System.Collections;

public class EnemyPatrol : MonoBehaviour
{
    Rigidbody2D enemyRigidBody2D;
    public int UnitsToMove = 5;
    public float EnemySpeed = 500;
    public bool _isFacingRight;
    private float _startPos;
    private float _endPos;

    public bool _moveRight = true;


    // Use this for initialization
    public void Awake()
    {
         enemyRigidBody2D = GetComponent<Rigidbody2D>();
        _startPos = transform.position.x;
        _endPos = _startPos + UnitsToMove;
        _isFacingRight = transform.localScale.x > 0;
    }


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

    if (_moveRight)
    {
        enemyRigidBody2D.AddForce(Vector2.right * EnemySpeed * Time.deltaTime);
        if (!_isFacingRight)
            Flip();
    }

    if (enemyRigidBody2D.position.x >= _endPos)
        _moveRight = false;

    if (!_moveRight)
    {
        enemyRigidBody2D.AddForce(-Vector2.right * EnemySpeed * Time.deltaTime);
        if (_isFacingRight)
            Flip();
    }
    if (enemyRigidBody2D.position.x <= _startPos)
        _moveRight = true;


}

    public void Flip()
    {
        transform.localScale = new Vector3(-transform.localScale.x, transform.localScale.y, transform.localScale.z);
        _isFacingRight = transform.localScale.x > 0;
    }

}