Input.mouseScrollDelta

描述

当前的鼠标滚动增量。（只读）

Input.mouseScrollDelta 存储在 Vector2.y 属性中。（Vector2.x 值将被忽略。）Input.mouseScrollDelta 可以是正数（向上）或负数（向下）。未旋转鼠标滚轮时，该值为零。注意，PC 上一般采用带有中心滚轮的鼠标。新版 macOS 在触控板上通过双指上下移动来模拟中心滚动。需要根据滚动速率，调整 mouseScrollDelta 返回的值。下面的示例中，使用了 0.1f 的 scale。

注意，mouseScrollDelta 为只读。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Input.mouseScrollDelta example
//
// Create a sphere moved by a mouse scrollwheel or two-finger
// slide on a Mac trackpad.

public class ExampleClass : MonoBehaviour
{
    private Transform sphere;
    private float scale;

    void Awake()
    {
        GameObject go = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        sphere = go.transform;

        // create a yellow quad
        go = GameObject.CreatePrimitive(PrimitiveType.Quad);
        go.transform.Rotate(new Vector3(90.0f, 0.0f, 0.0f));
        go.transform.localScale = new Vector3(4.0f, 4.0f, 4.0f);
        go.GetComponent<Renderer>().material.color = new Color(0.75f, 0.75f, 0.0f, 0.5f);

        // change the camera color and position
        Camera.main.clearFlags = CameraClearFlags.SolidColor;
        Camera.main.transform.position = new Vector3(2, 1, 5);
        Camera.main.transform.Rotate(0, -160, 0);

        scale = 0.1f;
    }

    void OnGUI()
    {
        Vector3 pos = sphere.position;
        pos.y += Input.mouseScrollDelta.y * scale;
        sphere.position = pos;
    }
}