Unity Input 触发两次答案

【问题标题】：Unity Input triggered twiceUnity Input 触发两次
【发布时间】：2018-02-14 17:45:10
【问题描述】：

我创建了一个小的 2D 横向卷轴运动。

private Rigidbody2D rigid;
private BoxCollider2D playerCollider;
private bool isMovingRight = false;
private Vector2 movement;
private bool jumpPressed;

private const int MOVEMENT_SPEED = 5;
private const int JUMP_POWER = 5;
private const float GROUNDCHECK_TOLERANCE_SIDE = 0.05f;
private const float GROUNDCHECK_TOLERANCE_BOTTOM = 0.05f;

private void Start()
{
    rigid = GetComponent<Rigidbody2D>();
    playerCollider = GetComponent<BoxCollider2D>();
}

private void Update()
{
    SetMovement();
}

private void FixedUpdate()
{
    Move();
}

private void SetMovement()
{
    float horizontalMovement = Input.GetAxis("horizontal") * MOVEMENT_SPEED;

    if (Input.GetButtonDown("Jump"))
    {
        jumpPressed = true;
    }

    movement = new Vector2(horizontalMovement, rigid.velocity.y);
}

private void Move()
{
    if (GroundCheck(true) || GroundCheck(false))
    {
        if (jumpPressed)
        {
            movement.y = JUMP_POWER;
            jumpPressed = false;
        }
    }

    rigid.velocity = movement;
}

private bool GroundCheck(bool checkLeftSide)
{
    Bounds colliderBounds = playerCollider.bounds;
    Vector2 rayPosition = colliderBounds.center;

    float horizontalRayPosition = colliderBounds.extents.x + GROUNDCHECK_TOLERANCE_SIDE;

    if (checkLeftSide)
    {
        rayPosition.x -= horizontalRayPosition;
    }
    else
    {
        rayPosition.x += horizontalRayPosition;
    }

    return Physics2D.Raycast(rayPosition, Vector2.down, (playerCollider.size.y / 2) + GROUNDCHECK_TOLERANCE_BOTTOM);
}

我在 Update 中注册 Inputs 并在 FixedUpdate 中处理 Physics。当按下跳跃按钮时，玩家可以正常跳跃。

但是当多次按下跳跃时，玩家会在空中跳起来，下来再跳一次。

因此，如果按下按钮超过 1 次，玩家将在完成第一次跳跃后进行第二次跳跃。

如何避免这种行为？

【问题讨论】：

这行代码movement.y = JUMP_POWER;应该是movement.y += JUMP_POWER;
不清楚你的目的是什么：你想在角色已经跳跃时完全禁用跳跃吗？或者在着陆前在第一个跳跃的基础上添加第二个跳跃，Metroid 风格？
如果你的groundcheck失败，设置jumpPressed = false。
您的逻辑是“按下 Jump？好的……我在地上吗？是的，将 Jump 设置为 false。不，我不在地上？什么都不做。”你应该只有在接地的情况下才能跳跃，所以如果你的接地检查都失败了，请使用 else 将 jumpPressed 设置为 false。

标签： c# unity3d

【解决方案1】：

使用您的代码，我添加了 2 个 cmets 和一个 else 语句来阐明我在 cmets 中的意思。这应该可以解决您的问题。

private void SetMovement()
{
    float horizontalMovement = Input.GetAxis("horizontal") * MOVEMENT_SPEED;

    if (Input.GetButtonDown("Jump"))
    {
        // Only ever gets set to false if you are grounded and it makes you jump.  
        // Should only be set to true if you can jump.  So you could add your groundChecks here... 
        // or use the method I am showing
        jumpPressed = true;   
    }

    movement = new Vector2(horizontalMovement, rigid.velocity.y);
}

private void Move()
{
    if (GroundCheck(true) || GroundCheck(false))
    {
        if (jumpPressed)
        {
            movement.y = JUMP_POWER; 
            // This was the only place this every was set to false, and 
            // specific conditions were required to make this happen.
            jumpPressed = false; 
        }
    }
    // fastest way to test
    else 
    {
         // yes they pressed jump but they can't jump so reset it, now 
         // they wont jump as soon as they land. just because they got 
         // trigger happy.
         jumpPressed = false; 
    }

    rigid.velocity = movement;
}

【讨论】：