Question

我遇到以下代码时出现问题：

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

public class FollowPath : MonoBehaviour
{
    public enum FollowType
    {
        MoveTowards,
        Lerp
    }

    public FollowType Type = FollowType.MoveTowards;
    public PathDefinition Path;
    public float Speed = 1;
    public float MaxDistanceToGoal = .1f;

    private IEnumerator<Transform> _currentPoint;

    public void Start()
    {
        if (Path == null)
        {
            Debug.LogError("Path cannot be null", gameObject);
            return;
        }

        _currentPoint = Path.GetPathEnumerator();
        _currentPoint.MoveNext();

        if (_currentPoint.Current == null)
            return;

        transform.position = _currentPoint.Current.position;
    }

    public void Update()
    {
        if (_currentPoint == null || _currentPoint.Current == null)
            return;

        if (Type == FollowType.MoveTowards)
            transform.position = Vector3.MoveTowards (transform.position,
                    _currentPoint.Current.position, Time.deltaTime * Speed);
        else if (Type == FollowType.Lerp)
            transform.position = Vector3.Lerp(transform.position,
                    _currentPoint.Current.position, Time.deltaTime * Speed);

        var distanceSquared = (transform.position -
                _currentPoint.Current.position).sqrMagnitude;
        if (distanceSquared < MaxDistanceToGoal * MaxDistanceToGoal)
            _currentPoint.MoveNext();
    }
}

以下是我遇到的错误：

Assets / Code / FollowPath.cs（28,36）：错误CS1061：输入PathDefinition' does not contain a definition for GetPathEnumerator＆＃39;并且没有扩展方法GetPathEnumerator' of type PathDefinition＆＃39;可以找到（你错过了使用指令或程序集引用吗？）

Answer 1

此缺失的代码似乎来自3DBuzz YouTube视频Creating 2D Games in Unity 4.5 #4 - Moving Platforms。用户26dollar转录了代码，我在这里自动格式化并重现：

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

public class PathDefinition : MonoBehaviour
{
    public Transform[] Points;

    public IEnumerator<Transform> GetPathEnumerator()
    {
        if (Points == null || Points.Length < 1)
            yield break;

        var direction = 1;
        var index = 0;
        while (true) {
            yield return Points[index];

            if (Points.Length == 1)
                continue;

            if (index <= 0)
                direction = 1;
            else if (index >= Points.Length - 1)
                direction = -1;

            index = index + direction;
        }
    }

    public void OnDrawGizmos()
    {
        if (Points == null || Points.Length < 2)
            return;

        for (var i = 1; i < Points.Length; i++) {
            Gizmos.DrawLine(Points[i - 1].position, Points[i].position);
        }
    }
}

Unity 2D错误1061

1 个答案: