Application.LoadLevel在if语句内无法正常工作问题求助

Hey there! Let's dig into why your Application.LoadLevel call isn't working and why that debug log isn't showing up—this is a super common Unity gotcha, so we'll break it down step by step.

First, let's address the core issue: your if statement isn't running at all #

If adding a Debug.Log() inside the if block gives no output, that means the condition in your if statement is never evaluating to true. Here's how to troubleshoot that:

• Check your condition variables: Print the values of the variables in your condition outside the if block. For example, if your code is if (playerScore >= 100), add Debug.Log("Current player score: " + playerScore); right before the if statement. This will tell you if the variable is actually reaching the value you expect.
• Double-check logic operators: Did you mix up == and =? Or use && when you meant ||? Small typos here can completely break your condition.

Next, even if the condition works, Application.LoadLevel might fail for these reasons #

Once you confirm the if statement is triggering, here are the most common fixes for the level loading issue:

• Verify your level is in Build Settings: Go to File > Build Settings and make sure the level you're trying to load is listed in the Scenes In Build section. If it's not, drag it from the Project window into this list.
• Watch for case sensitivity: Unity treats level names as case-sensitive. If your level is named FinalLevel but you write Application.LoadLevel("finallevel"), it won't work—match the exact spelling and capitalization.
• Use the modern SceneManager API (for Unity 5.3+): Application.LoadLevel is deprecated in newer Unity versions. Replace it with SceneManager.LoadScene() instead, and don't forget to add the namespace at the top of your script:

  using UnityEngine.SceneManagement; // Required for SceneManager
  

  Then call it like this:

  SceneManager.LoadScene("YourLevelName");
  

• Check if your script's GameObject is active: If the GameObject holding your script is disabled (greyed out in the Hierarchy), or the script component itself is unchecked in the Inspector, your code won't run at all.

Example of a fixed script #

Here's how your code might look after applying these fixes:

using UnityEngine;
using UnityEngine.SceneManagement;

public class LevelTrigger : MonoBehaviour
{
    public int requiredScore = 100;
    private int playerScore;

    void Update()
    {
        // Print score to confirm condition is met
        Debug.Log("Current Score: " + playerScore);

        if (playerScore >= requiredScore)
        {
            Debug.Log("Loading target level!");
            // Use modern SceneManager API
            SceneManager.LoadScene("WinLevel");
        }
    }

    // Example method to update score
    public void AddScore(int points)
    {
        playerScore += points;
        Debug.Log("Score updated: " + playerScore);
    }
}

Quick test to isolate the problem #

If you're still stuck, create a minimal test scene:

1. Make a new script with just a button click that triggers if (true) { SceneManager.LoadScene("TestLevel"); }
2. Add the test level to Build Settings
3. Click the button—if this works, the issue is in your original condition or script setup, not the level loading itself.

内容的提问来源于stack exchange，提问作者Tom Jones