2d unity，如何仅在 x 轴上使用 touch/finger 拖动对象

Question

这里有人可以帮助我。我是团结的新手。我正在努力使对象仅在 x 轴/y 轴上移动，当对象触摸并向左拖动时，对象向左移动并在触摸或删除对象时停止。

using UnityEngine;
using System.Collections;

public class MoveScriptVertical : MonoBehaviour 
{
    //touch offset allows ball not to shake when it start moving

    float deltax,deltay;
    Rigidbody2D rb;

    bool moveAllowed = false;

    void Start ()
    {
        rb = GetComponent<Rigidbody2D> ();
    }

    void Update ()
    {
        //touch event
        if (Input.touchCount > 0)
        {
            Touch touch = Input.GetTouch (0);

            //knowing the touch position
            Vector2 touchPos = Camera.main.ScreenToWorldPoint(touch.position);

            //touch phase

            switch (touch.phase)
            {
            case TouchPhase.Began:
                //if you touch the car
                if (GetComponent<Collider2D> () == Physics2D.OverlapPoint (touchPos)) 
                {
                    //get the offset between position you touch
                    deltax = touchPos.x - transform.position.x;
                    deltay = touchPos.y - transform.position.y;

                    //if touch began within  the car collider
                    //then it is allowed to move

                    moveAllowed = true;

                    //restriction some rigidbody properties
                    rb.freezeRotation = true;
                    rb.velocity = new Vector2 (0, 0);
                    GetComponent<BoxCollider2D> ().sharedMaterial = null;
                }
                break;

            //you move your finger
            case TouchPhase.Moved:                   
                //if you touches the car and move is allowed
                if (GetComponent<Collider2D> () == Physics2D.OverlapPoint (touchPos) && moveAllowed)
                    rb.MovePosition (new Vector2 (0, touchPos.y - deltay));

                break;

            //you released your finger
            case TouchPhase.Ended:
                //restore intial parameters
                //when touch is ended
                moveAllowed = false;
                rb.freezeRotation = true;
                rb.gravityScale = 0;
                PhysicsMaterial2D mat = new PhysicsMaterial2D ();
                GetComponent<BoxCollider2D> ().sharedMaterial = mat;
                break;
            }
        }
    }
}

Answer 1

有一些库允许您拥有复杂的手指事件，例如 Touchscript。如果您选择此解决方案，您将在线找到教程。

最基本的方法是使用 unity 的输入 class 和一个不错的文档：https://docs.unity3d.com/ScriptReference/Input.html

这样您就可以知道手指何时触摸了屏幕或在屏幕上移动了。它会给你 x 和 y 坐标，所以如果你只想沿着 x 移动，你将只使用 x 值，例如使用

翻译你的对象

transform.Translate(new Vector3(x, 0f, 0f));

编辑

由于您使用的是 touchscript，请查看 TransformGesture，它应该允许您处理许多转换事件。如果你想有更多的控制，你可以改用 PressGesture、PanGesture 和 ReleaseGesture

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