按下 UI 按钮时连续运行代码

Question

我正在 Unity 中制作一个平台游戏，其中球通过三个按钮移动：

• 向右移动
• 向左移动
• 跳跃

我已经拥有了现在可以使用的所有功能，但是要移动角色我需要继续发送一个按钮，而不是像我想要的那样按住它。我尝试了一些在教程中找到的方法，但由于我还是个初学者，我没能成功。

这是我的 Move2D 脚本附加到角色的代码：

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

public class Move2D : MonoBehaviour
{
    public float moveSpeed = 5f;
    public bool isGrounded = false;

    [SerializeField] private Rigidbody2D rigidbody;

    private void Awake()
    {
        if (!rigidbody) rigidbody = GetComponent<Rigidbody2D>();
    }

    public void Jump()
    {
        if (isGrounded)
        {
            rigidbody.AddForce(new Vector3(0f, 5f), ForceMode2D.Impulse);
        }
    }

    public void Move(float value)
    {
        Vector3 movement = new Vector3(value, 0f, 0f);
        transform.position += movement * Time.deltaTime * moveSpeed;
    }
}

而这是第二个脚本，主要控制所有的运动：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class ContinuesButton : MonoBehaviour, IPointerExitHandler, IPointerDownHandler, IPointerUpHandler
{
    [SerializeField] private Button button;

    [SerializeField] private UnityEvent whilePressed;

    private readonly bool isHover;

    private void Awake()
    {
        if (!button) button = GetComponent<Button>();
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        StartCoroutine(WhilePressed());
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        StopAllCoroutines();
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        StopAllCoroutines();
    }

    private IEnumerator WhilePressed()
    {
        while (true)
        {
            whilePressed?.Invoke();
            yield return null;
        }
    }
}

非常感谢任何信息或解释，因为这部分对我的游戏非常重要！ :)

Answer 1

由于您的玩家有一个刚体，您可以通过刚体的速度而不是通过它的变换来移动玩家。
（这也使它更加一致，因为您的跳转实现使用刚体）

速度由Direction 和Speed 组成；由于速度是恒定的，您可以让按钮设置移动的方向。
并且由于您希望玩家按住按钮才能移动，您可以设置移动的方向OnPointerDown，并且当OnPointerUp 发生时重置它，如下所示：

Move2D.cs

public class Move2D : MonoBehaviour {
    // ...

    [SerializeField]
    private float speed;

    private Rigidbody2D rigidBody;

    private Vector2 currentMoveDirection;

    private void Awake() {
        rigidBody = GetComponent<Rigidbody2D>();
        currentMoveDirection = Vector2.zero;
    }

    // ...

    private void FixedUpdate() {
        rigidBody.velocity = (currentMoveDirection + new Vector2(0f, rigidBody.velocity.y)).normalized * speed;
    }

    public void TriggerMoveLeft() {
        currentMoveDirection += Vector2.left;
    }

    public void StopMoveLeft() {
        currentMoveDirection -= Vector2.left;
    }

    public void TriggerMoveRight() {
        currentMoveDirection += Vector2.right;
    }

    public void StopMoveRight() {
        currentMoveDirection -= Vector2.right;
    }
}

PlayerMoveButton.cs

（或你的ContinuesButton.cs）

public class PlayerMoveButton : MonoBehaviour, IPointerDownHandler, IPointerUpHandler {
    [SerializeField]
    private Button targetButton;

    [SerializeField, Tooltip("The targeted player's movement component")]
    private Move2D playerMovement;

    [SerializeField, Tooltip("True if this button moves the player to the left")]
    private bool movesLeft;

    // ...

    public void OnPointerDown(PointerEventData eventData) {
        if (movesLeft) {
            playerMovement.TriggerMoveLeft();
        } else {
            playerMovement.TriggerMoveRight();
        }
    }

    public void OnPointerUp(PointerEventData eventData) {
        if (movesLeft) {
            playerMovement.StopMoveLeft();
        } else {
            playerMovement.StopMoveRight();
        }
    }
}

示例：

现在点击LeftButton (OnPointerDown)，currentMoveDirection 设置为Left (-1, 0)。
松开按钮的那一刻(OnPointerUp)，currentMoveDirection 重置为正常@ 987654334@

玩家通过currentMoveDirection * speed设置速度来不断移动

编辑

为了保留jump 运动，而不是简单地执行currentMoveDirection * speed，您需要将当前向上的方向添加到它，如下所示：

private void FixedUpdate() {
    rigidBody.velocity = (currentMoveDirection + new Vector2(0f, rigidBody.velocity.y)).normalized * speed;
}