Question

我使用以下代码行来准确检测四个方向的滑动，但我不明白为什么它不起作用请帮助

void Update ()
{
    if (Input.GetKey(KeyCode.Joystick1Button9))
        Application.Quit();
    Dictionary<int, Touch> touch = new Dictionary<int, Touch>();
    foreach (Touch t in Input.touches)
    {
        Vector2 Direction = new Vector2(0,0);
        switch (t.phase)
        {
            case TouchPhase.Began:
                touch[t.fingerId] = t;
                Swiped = false;
                break;
            case TouchPhase.Ended:
                if (touch.ContainsKey(t.fingerId))
                {
                    Direction = t.position - touch[t.fingerId].position;
                    Direction = Direction.normalized;
                    Swiped = true;
                }
                else
                    Swiped = false;
                break;
            default :
                Swiped = false;
                break;
        }
        if (Swiped)
        {
            if (Vector2.Dot(Direction,Vector2.up) > Mathf.Sqrt(1/2f))
            {
                GameObject.FindObjectOfType<Light>().color = Color.red ;
                RandomObjects();
            }
            else if (Vector2.Dot(Direction, -1*Vector2.up) > Mathf.Sqrt(1/2f))
            {
                GameObject.FindObjectOfType<Light>().color = Color.green;
                RandomObjects();
            }
            else if (Vector2.Dot(Direction, Vector2.right) > Mathf.Sqrt(1/2f))
            {
                GameObject.FindObjectOfType<Light>().color = Color.blue;
                RandomObjects();
            }
            else if (Vector2.Dot(Direction,-1 * Vector2.right) > Mathf.Sqrt(1/2f))
            {
                GameObject.FindObjectOfType<Light>().color = Color.yellow;
                RandomObjects();
            }
        }
    }    
}

正如所建议我停止使用Coroutine并在Update（）方法中编写代码。

Answer 1

您的代码中存在许多问题：

代码无效，因为您在Input.GetTouch()之后不能再次致电WaitForSeconds。
不是准确的滑动检测。严格来说，它根本不是滑动检测。如果您在第二次点击时双击并按住手指，则代码会将其检测为滑动。虽然不是。此外，将不会检测到持续时间少于0.5秒的手势。要进行准确的手势检测，您需要不断分析用户的输入。

所以，它应该是这样的：

const float swipeThreshold = 100.0f;

IEnumerator SwipeInput(Action<Vector2> onSwipe)
{
    Dictionary<int, Touch> activeTouches = new Dictionary<int, Touch>();
    Dictionary<int, Vector3> activeButtons = new Dictionary<int, Vector3>();
    while (true)
    {
        if (Input.touches.Length > 0)
            foreach (Touch touch in Input.touches)
                switch (touch.phase)
                {
                    case TouchPhase.Began:
                        activeTouches[touch.fingerId] = touch;
                        break;
                    case TouchPhase.Ended:
                        if (activeTouches.ContainsKey(touch.fingerId))
                        {
                            Vector2 delta = touch.position - activeTouches[touch.fingerId].position;
                            if (delta.magnitude > swipeThreshold)
                                onSwipe(delta);
                        }
                        break;
                }
        else
            for (int i = 0; i <= 2; ++i)
            {
                if (Input.GetMouseButtonDown(i))
                    activeButtons[i] = Input.mousePosition;
                else if (Input.GetMouseButtonUp(i) && activeButtons.ContainsKey(i))
                {
                    Vector2 delta = Input.mousePosition - activeButtons[i];
                    if (delta.magnitude > swipeThreshold)
                        onSwipe(delta);
                }
            }
        yield return new WaitForFixedUpdate();
    }
}

P.S。协同程序看起来很酷。但是不要将它用于你能想到的一切。或者你最终会争取同步它们。只有在你真正需要它们时才使用它们。即使用它们时会产生更清晰，紧凑或优雅的代码。例如，手势检测并非如此。

Unity使用协同程序滑动输入

1 个答案: