unity 两指缩放图片，两指旋转图片，单击恢复图片原始大小和旋转，按住拖动图片位置

您可以使用 Unity 中的 Touch 类来实现这些功能。以下是一个示例代码，可以实现您所需的功能：

using UnityEngine;

public class TouchControl : MonoBehaviour
{
    private float initialFingersDistance;
    private float currentFingersDistance;

    private Vector3 initialScale;
    private Quaternion initialRotation;
    private Vector3 initialPosition;

    private bool isDragging = false;
    private Vector3 dragStartPosition;

    private void Update()
    {
        if (Input.touchCount == 1)
        {
            Touch touch = Input.GetTouch(0);

            if (touch.phase == TouchPhase.Began)
            {
                // Single tap to reset position and rotation
                initialPosition = transform.position;
                initialRotation = transform.rotation;
                initialScale = transform.localScale;
            }
            else if (touch.phase == TouchPhase.Moved)
            {
                // Dragging to move the object
                if (!isDragging)
                {
                    isDragging = true;
                    dragStartPosition = touch.position;
                }
                else
                {
                    Vector3 dragDelta = Camera.main.ScreenToWorldPoint(touch.position) - Camera.main.ScreenToWorldPoint(dragStartPosition);
                    transform.position = initialPosition + dragDelta;
                }
            }
            else if (touch.phase == TouchPhase.Ended)
            {
                isDragging = false;
            }
        }
        else if (Input.touchCount == 2)
        {
            Touch touch1 = Input.GetTouch(0);
            Touch touch2 = Input.GetTouch(1);

            if (touch1.phase == TouchPhase.Began || touch2.phase == TouchPhase.Began)
            {
                // Starting to pinch or rotate
                initialFingersDistance = Vector2.Distance(touch1.position, touch2.position);
                initialRotation = transform.rotation;
                initialScale = transform.localScale;
            }
            else if (touch1.phase == TouchPhase.Moved || touch2.phase == TouchPhase.Moved)
            {
                // Pinching to scale the object
                currentFingersDistance = Vector2.Distance(touch1.position, touch2.position);
                float scaleFactor = currentFingersDistance / initialFingersDistance;
                transform.localScale = initialScale * scaleFactor;

                // Rotating around the object's center
                Vector3 center = (touch1.position + touch2.position) / 2f;
                Vector3 direction = (touch2.position - touch1.position).normalized;
                Quaternion rotation = Quaternion.LookRotation(direction, Vector3.up);
                transform.rotation = rotation * initialRotation;

                // Moving the object while scaling and rotating
                if (isDragging)
                {
                    Vector3 dragDelta = Camera.main.ScreenToWorldPoint(center) - Camera.main.ScreenToWorldPoint(dragStartPosition);
                    transform.position = initialPosition + dragDelta;
                }
            }
            else if (touch1.phase == TouchPhase.Ended || touch2.phase == TouchPhase.Ended)
            {
                isDragging = false;
            }
        }
    }
}

这段代码会检测触摸屏幕的手指数量和手指的移动，以实现拖动、缩放和旋转图片的功能。您可以将这段代码加入到一个空物体上，并将图片作为其子对象，以便对图片进行控制。