How Can I Ensure My Unity Game Manager Script Executes Only Once and Persists Across Scenes?

Ensuring Single Execution and Persistence of Unity Game Manager Scripts Across Scenes

The Challenge:

Many Unity developers encounter a common problem: their game manager script, designed to persist across scenes, only executes once despite being included in every scene.

The Solution: The Preload Scene

The key to solving this is a preload scene, a crucial but often overlooked element in Unity project setup.

Creating the Preload Scene:

1. Create a new scene: Name it "preload" and ensure it's set as scene index 0 in the Build Settings.
2. Add an empty GameObject: In the "preload" scene, create an empty GameObject named "__app".
3. Attach DontDestroyOnLoad: Attach the DontDestroyOnLoad script to the "__app" GameObject.

Organizing Game Behaviors:

All global game behaviors—database connections, sound managers, scorekeeping, etc.—should reside exclusively on the "__app" GameObject within the preload scene. This ensures their availability across all scenes.

Streamlined Scene Loading:

To simplify the process, consider adding a script that automatically loads the preload scene if it's not already active.

Alternative: Global Variables (Simpler Cases)

For less complex projects, using global variables can offer a simpler solution. Access these variables with a single line of code:

public static Sound sound = Object.FindObjectOfType<Sound>();

In Summary:

By implementing a preload scene and adhering to these best practices, your game manager script will execute only once, persist across all scenes, and provide consistent access to essential game functionalities.

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