What is MonoBehaviour?

Learn the MonoBehaviour base class and its role.

What is MonoBehaviour?

MonoBehaviour is the base class inside UnityEngine. To add a C# script to a GameObject as a component, your class must derive from it. This way Unity binds your script to an object in the scene.

using UnityEngine;

public class Oyuncu : MonoBehaviour
{
    void Start()
    {
        Debug.Log("Merhaba");
    }
}

The class above can now be added to a GameObject as a component.

Base class and lifecycle

MonoBehaviour is a base class; with : MonoBehaviour you derive from it. Unity itself calls certain methods of this class without you calling them, and this is called the lifecycle. You only write the methods; Unity manages the call order.

public class Dusman : MonoBehaviour
{
    void Start()
    {
        Debug.Log("Hazir");
    }

    void Update()
    {
        // runs every frame
    }
}

It is enough to spell the method names correctly.

Exercise Write your first MonoBehaviour

Derive a class named Oyuncu from MonoBehaviour. In a Start method, print the text "Merhaba Unity" with Debug.Log.

Show example solution

using UnityEngine;

public class Oyuncu : MonoBehaviour
{
    void Start()
    {
        Debug.Log("Merhaba Unity");
    }
}

Test yourself

How must a class be defined so that a script can be added to a GameObject as a component?
- As class Oyuncu : MonoBehaviour
- As class Oyuncu : GameObject
- As static class Oyuncu
- As class Oyuncu with no base class
Show answer

As class Oyuncu : MonoBehaviour — Classes that derive from MonoBehaviour gain Unity's lifecycle methods and can be added as components.

Derive the class from MonoBehaviour

using UnityEngine;

public class Oyuncu : ____
{
    void Start()
    {
        Debug.Log("Hazir");
    }
}

Show answer

using UnityEngine;

public class Oyuncu : MonoBehaviour
{
    void Start()
    {
        Debug.Log("Hazir");
    }
}

Parts of MonoBehaviour

MonoBehaviour

The base class scripts derive from
: MonoBehaviour

The inheritance declaration
void Start()

A method Unity calls
Debug.Log

Writes text to the console

Next lesson: The Start method

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