unity 手指控制UI移动和放大缩小

直接将下面的update方法放在mono类下即可。

指定一下所要控制的物体。

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void Update()
    {
        Ray ray = new Ray();
        ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);

        if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(0).phase == TouchPhase.Stationary)
        {
            Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
            transform.Translate(touchDeltaPosition.x * Time.deltaTime *0.03f, touchDeltaPosition.y * Time.deltaTime * 0.03f, 0);
        }
        if (Input.touchCount > 1)
        {
            //当第二根手指按下的时候
            if (Input.GetTouch(1).phase == TouchPhase.Began)
            {
                isTwoTouch = true;
                //获取第一根手指的位置
                firstTouch = Input.touches[0].position;
                //获取第二根手指的位置
                secondTouch = Input.touches[1].position;

                lastDistance = Vector2.Distance(firstTouch, secondTouch);
            }

            //如果有两根手指按下
            if (isTwoTouch)
            {
                //每一帧都得到两个手指的坐标以及距离
                firstTouch = Input.touches[0].position;
                secondTouch = Input.touches[1].position;
                twoTouchDistance = Vector2.Distance(firstTouch, secondTouch);

                //当前图片的缩放
                Vector3 curImageScale = new Vector3(image.localScale.x, image.localScale.y, 1);
                //两根手指上一帧和这帧之间的距离差
                //因为100个像素代表单位1，把距离差除以100看缩放几倍
                float changeScaleDistance = (twoTouchDistance - lastDistance) / 100;
                //因为缩放 Scale 是一个Vector3，所以这个代表缩放的Vector3的值就是缩放的倍数
                Vector3 changeScale = new Vector3(changeScaleDistance, changeScaleDistance, 0);
                //图片的缩放等于当前的缩放加上 修改的缩放
                image.localScale = curImageScale + changeScale;
                //控制缩放级别
                image.localScale = new Vector3(Mathf.Clamp(image.localScale.x, 0.5f, 10f), Mathf.Clamp(image.localScale.y, 0.5f, 10f), 1);
                //这一帧结束后，当前的距离就会变成上一帧的距离了
                lastDistance = twoTouchDistance;
            }

            //当第二根手指结束时（抬起）
            if (Input.GetTouch(1).phase == TouchPhase.Ended)
            {
                isTwoTouch = false;
                firstTouch = Vector3.zero;
                secondTouch = Vector3.zero;
            }
        }