要限制Angular ，您可以在Mathf.MoveTowardsAngle的帮助下更改Angular 值，然后Clamp它。

[SerializeField] private float rotationSpeed = 6;
private float newZ;
void Update()
{
    ...
    if (input != 0)
    {
       newZ = Mathf.MoveTowardsAngle(newZ, newZ + input, Time.deltaTime * Mathf.PI * rotationSpeed);
       newZ = Mathf.Clamp(newZ, minAngle, maxAngle);
       transform.localEulerAngles = new Vector3 (0, 0, newZ);
    }
    ...
}

问题是Unity的EulerAngular 范围从0到360，但您使用的系统范围从-180到180。当您使用transform.localEulerAngles.Set（）设置Angular 时，您无法阻止Unity将值转换为自己的系统。因此，您需要将从transform.localEulerAngles.z获得的Angular 转换回您的系统：

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

public class NewBehaviourScript : MonoBehaviour
{

    public float rotationSpeed = 5f;
    public float minAngle = -45f;
    public float maxAngle = 45f;

    public float newRotation;

    private void Update()
    {
        // Get input from up and down arrow keys
        float input = 0;

        if (Keyboard.current.upArrowKey.isPressed) // I'm using Input system package
        {
            input = 1;
        }
        else if (Keyboard.current.downArrowKey.isPressed)
        {
            input = -1;
        }

        // Calculate new rotation based on input and speed
        newRotation = ShiftAngle(transform.localEulerAngles.z) + (-input * rotationSpeed);

        // Clamp the new rotation to be within the minimum and maximum angles
        newRotation = Mathf.Clamp(newRotation, minAngle, maxAngle);

        // Set the new rotation of the gun
        transform.localEulerAngles = new Vector3(0, 0, newRotation);
    }

    float ShiftAngle(float a)
    {
        if (a > 180) a -= 360;
        return a;
    }
}

过去我在尝试修改现有Angular 时遇到过很多问题，因为你是以欧拉角的形式阅读和写入Angular ，但Unity的内部旋转表示是四元数。这意味着你读取的Angular 将取决于Unity从四元数到欧拉角的转换，这可能与你写的值不一致。你可以写一个360度的值，当你读它时，你可能得到零。当你写270度时，你读它时得到270，还是-90等等
对我个人来说，过去最好的解决方案是跟踪我自己的Angular 。如果你所做的只是阅读旋转，修改它，然后编写旋转，那么就自己跟踪这些Angular ，并使用它，而不是轮询对象的旋转：

using UnityEngine;
using UnityEngine.InputSystem;

public class GunController : MonoBehaviour
{
    public float rotationSpeed = 5f;
    public float minAngle = -45f;
    public float maxAngle = 45f;
    public float currentAngle = 0f;

    private void Update ()
    {
        // Get input from up and down arrow keys
        float input = 0;

        if (Keyboard.current.upArrowKey.isPressed) // I'm using Input system package
        {
            input = 1;
        }
        else if (Keyboard.current.downArrowKey.isPressed)
        {
            input = -1;
        }

        // Calculate new rotation based on input and speed
        currentAngle += -input * rotationSpeed;

        // Clamp the new rotation to be within the minimum and maximum angles
        currentAngle = Mathf.Clamp (currentAngle, minAngle, maxAngle);

        // Set the new rotation of the gun
        transform.localEulerAngles = new Vector3 (0, 0, currentAngle);
    }
}