Untiy中对于移动端的一些手势操作

一：滑动屏幕在固定轴上移动物体

using UnityEngine;

public class Test : MonoBehaviour
{
    public float speed; //速度
    
    //判断手势
    private void JudgeGesture()
    {
        if (Input.touchCount == 1)
        {
            Touch touch = Input.GetTouch(0);
            if (touch.phase == TouchPhase.Moved)
            {
                Vector2 touchDeltaPosition = touch.deltaPosition;
                transform.Translate(touchDeltaPosition.x * speed, 0, 0);
            }
        }
    }
}

---

二：点击屏幕

using UnityEngine;

public class Test : MonoBehaviour
{
    //判断手势
    private void JudgeGesture()
    {
        //单击
        if (Input.touchCount == 1)
        {
            Touch touch = Input.GetTouch(0);
            if (touch.phase == TouchPhase.Began)
            {
                //TODO
            }
        }

        //双击
        if (Input.touchCount == 1)
        {
            Touch touch = Input.GetTouch(0);
            if (touch.phase == TouchPhase.Began && touch.tapCount == 2)
            {
                //TODO
            }
        }
    }
}

---

三：长按屏幕

using UnityEngine;

public class Test : MonoBehaviour
{
    private bool newTouch; //是否为新的触摸
    private float touchTime; //触摸的时间

    public float timeval;//时间间隔
    
    //判断手势
    private void JudgeGesture()
    {
        //长按
        if (Input.touchCount == 1)
        {
            Touch touch = Input.GetTouch(0);
            if (touch.phase == TouchPhase.Began)
            {
                newTouch = true;
                touchTime = Time.time;
            }
            else if (touch.phase == TouchPhase.Stationary)
            {
                if (newTouch && Time.time - touchTime > timeval)
                {
                    //TODO
                    newTouch = false;
                }
            }
            else
            {
                newTouch = false;
            }
        }
    }
}

---

四：旋转物体

using UnityEngine;

public class Test : MonoBehaviour
{
    public float speed; //速度

    private void Update()
    {
        JudgeGesture();
    }

    //判断手势
    private void JudgeGesture()
    {
        //旋转
        if (Input.touchCount == 1)
        {
            Touch touch = Input.GetTouch(0);
            if (touch.phase == TouchPhase.Moved)
            {
                transform.Rotate(Vector3.up * Time.deltaTime * speed * -Input.GetAxis("Mouse X"));
            }
        }
    }
}

---

五：缩放物体

using UnityEngine;

public class Test : MonoBehaviour
{
    private Vector3 oldPos1; //手指1的旧位置
    private Vector3 oldPos2; //手指2的旧位置

    public float deltaValue; //缩放的增量值
    public float maxScale; //最大的缩放值
    public float minScale; //最小的缩放值

    //判断手势
    private void JudgeGesture()
    {
        //缩放
        if (Input.touchCount == 2)
        {
            Touch touch0 = Input.GetTouch(0);
            Touch touch1 = Input.GetTouch(1);
            if (touch0.phase == TouchPhase.Moved || touch1.phase == TouchPhase.Moved)
            {
                Vector2 newPos1 = touch0.position;
                Vector2 newPos2 = touch1.position;
                if (Mathf.Abs(Vector3.Distance(newPos1, newPos2)) > Mathf.Abs(Vector3.Distance(oldPos1, oldPos2)))
                {
                    if (transform.localScale.x > maxScale)
                    {
                        return;
                    }

                    float oldScale = transform.localScale.x;
                    float newScale = oldScale * deltaValue;
                    transform.localScale = new Vector3(newScale, newScale, newScale);
                }
                else if (Mathf.Abs(Vector3.Distance(newPos1, newPos2)) <
                         Mathf.Abs(Vector3.Distance(oldPos1, oldPos2)))
                {
                    if (transform.localScale.x < minScale)
                    {
                        return;
                    }

                    float oldScale = transform.localScale.x;
                    float newScale = oldScale / deltaValue;
                    transform.localScale = new Vector3(newScale, newScale, newScale);
                }

                oldPos1 = newPos1;
                oldPos2 = newPos2;
            }
        }
    }
}