Unity中公共变量设为静态后无法在Inspector编辑的问题

Hey there! Let's work through this common Unity beginner issue—you're closer than you think, and the fix is simpler than making days static. The core problem here is a misunderstanding of variable scoping: you don't need days to be static for your private hours variable to access it, even within the same script.

Here are three solid solutions depending on your needs:

1. One-Time Initialization (For Fixed Values) #

If you only need to calculate hours once when the game starts (and days won't change during runtime), just use Awake() or Start() to compute it:

public class TimeCalculator : MonoBehaviour
{
    // Visible and editable in the Inspector
    public int days = 3;
    // Internal value for code use
    private int hours;

    void Awake()
    {
        hours = days * 24;
    }

    // Example usage in your code
    void LogTotalHours()
    {
        Debug.Log($"Total hours: {hours}");
    }
}

This keeps days as a regular public instance variable (so Inspector-friendly) and lets hours access it directly without static.

2. Real-Time Sync with Properties (For Dynamic Values) #

If days might change during runtime (via code or Inspector tweaks), use a C# property to auto-update hours whenever days is modified. To keep the Inspector visibility, we'll use [SerializeField] on a private backing field:

public class TimeCalculator : MonoBehaviour
{
    // Hidden from other scripts, but visible in Inspector
    [SerializeField] private int _days = 3;
    // Internal computed value
    private int hours;

    // Public property to control access to _days
    public int Days
    {
        get => _days;
        set
        {
            _days = value;
            // Auto-update hours every time Days is set
            hours = _days * 24;
            // Optional: Add validation (e.g., prevent negative days)
            _days = Mathf.Max(_days, 0);
        }
    }
}

Now, whether you adjust _days in the Inspector or set Days via code, hours will always stay in sync.

3. Edit-Mode Real-Time Updates (For Editor Workflow) #

If you want hours to update while you're working in the Unity Editor (without entering Play Mode), use the OnValidate() method—it triggers automatically whenever you modify a variable in the Inspector:

public class TimeCalculator : MonoBehaviour
{
    public int days = 3;
    private int hours;

    void OnValidate()
    {
        // Update hours immediately when days is changed in the Inspector
        hours = days * 24;
        // Add validation to avoid invalid values
        days = Mathf.Clamp(days, 0, int.MaxValue);
    }

    void Start()
    {
        // Double-check the value when entering Play Mode
        hours = days * 24;
    }
}

Key Takeaways #

• Never use static here—static variables are for shared values across all instances of a script, which isn't what you need. Regular instance variables work perfectly for accessing days from hours in the same script.
• Use [SerializeField] private int days if you want to hide days from other scripts but still let the Inspector edit it (this is a best practice to enforce encapsulation).
• Pick the solution that matches your workflow: one-time setup, dynamic runtime changes, or editor-side real-time updates.

内容的提问来源于stack exchange，提问作者Aaa