Question

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

    public class Keyboard_Input : MonoBehaviour {
        public float speed = 5f;

        void Start () {

            Dictionary<KeyCode, Vector3> directions = new Dictionary<KeyCode, Vector3>();
        {
            directions.Add(KeyCode.W, Vector3.forward );
            directions.Add(KeyCode.S, Vector3.back );
            directions.Add(KeyCode.A, Vector3.left );
            directions.Add(KeyCode.D, Vector3.right );
        };
        }


         void Update () {

            foreach(KeyValuePair<KeyCode, Vector3> direction in directions)
             {
                if (Input.GetKey(directions))
                {

                    this.transform.Translate(directions[direction] * speed * Time.deltaTime, Space.Self);
                }
            }
        }
    }

1.我每次写指示时都会收到错误 - 当前上下文中不存在“方向”这个名称这发生在第25,27,30行

Answer 1

您在directions方法中声明Start，因此它是一个本地变量。您应该将其声明为字段 - 并且我将其设置为静态字段，因为您不需要为每个实例使用不同的字典。您可以使用集合初始值设定项在一个表达式中初始化它：

private static readonly Dictionary<KeyCode, Vector3> directions =
    new Dictionary<KeyCode, Vector3>
    {
        { KeyCode.W, Vector3.forward },
        { KeyCode.S, Vector3.back },
        { KeyCode.A, Vector3.left },
        { KeyCode.D, Vector3.right }
    };

Answer 2

你使用{};在字典初始化中你不应该这样做。

 void Start () 
 {
        Dictionary<KeyCode, Vector3> directions = new Dictionary<KeyCode, Vector3>();
        directions.Add(KeyCode.W, Vector3.forward );
        directions.Add(KeyCode.S, Vector3.back );
        directions.Add(KeyCode.A, Vector3.left );
        directions.Add(KeyCode.D, Vector3.right );
 }

或者您可以使用集合初始化程序初始化它：

 void Start () 
 {
        var directions = new Dictionary<KeyCode, Vector3>
        {
            { KeyCode.W, Vector3.forward },
            { KeyCode.S, Vector3.back },
            { KeyCode.A, Vector3.left },
            { KeyCode.D, Vector3.right}
        };
 }

字符控制器的字典功能

2 个答案: