unityUI像地图一样单指移动缩放的实现过程和代码

实现unityUI像地图一样单指移动缩放，可以参考以下步骤和代码：

1. 在Canvas下创建一个Image作为地图背景

2. 编写脚本控制地图的移动和缩放

using UnityEngine;
using UnityEngine.EventSystems;

public class MapController : MonoBehaviour, IDragHandler, IScrollHandler
{
    [SerializeField] private float zoomSpeed = 0.1f;
    [SerializeField] private float moveSpeed = 1f;
    [SerializeField] private float minZoom = 0.5f;
    [SerializeField] private float maxZoom = 2f;

    private RectTransform rectTransform;
    private Vector2 pointerStart;
    private Vector2 pointerOld;
    private float zoom = 1f;

    private void Awake()
    {
        rectTransform = GetComponent<RectTransform>();
    }

    public void OnDrag(PointerEventData eventData)
    {
        Vector2 pointerDelta = eventData.position - pointerOld;
        pointerOld = eventData.position;

        rectTransform.anchoredPosition += pointerDelta * moveSpeed / zoom;
    }

    public void OnScroll(PointerEventData eventData)
    {
        zoom -= eventData.scrollDelta.y * zoomSpeed;
        zoom = Mathf.Clamp(zoom, minZoom, maxZoom);

        rectTransform.localScale = Vector3.one * zoom;
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        pointerOld = pointerStart = eventData.position;
    }
}

3. 在场景中将这个脚本挂载在地图Image上

4. 在场景中添加EventSystem组件

5. 在场景中添加TouchInputModule组件

6. 运行程序，用单指拖动地图，用双指缩放地图

注意：要使单指拖动地图，需要将EventSystem的Input Module设置为Touch Input Module，并将其Drag Threshold设置为0。同时，要在代码中实现IDragHandler接口。