What is MonoBehaviour?
- Game Development course
- Beginner
- Lesson 31/83
- 4 min
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.
Practice Write your first MonoBehaviour
Derive a class named Oyuncu from MonoBehaviour. In a Start method, print the text "Merhaba Unity" with Debug.Log.
Starter code
using UnityEngine;
public class Oyuncu : MonoBehaviour
{
// Start metodunu ve yazdirma kodunu buraya ekle
}Sample solution
using UnityEngine;
public class Oyuncu : MonoBehaviour
{
void Start()
{
Debug.Log("Merhaba Unity");
}
}Expected output
Merhaba Unity
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 How must a class be defined so that a script can be added to a GameObject as a component?
- As class Oyuncu : MonoBehaviour Correct answer
- As class Oyuncu : GameObject
- As static class Oyuncu
- As class Oyuncu with no base class
Explanation: Classes that derive from MonoBehaviour gain Unity's lifecycle methods and can be added as components.
2 Derive the class from MonoBehaviour
using UnityEngine;
public class Oyuncu : ____
{
void Start()
{
Debug.Log("Hazir");
}
}using UnityEngine;
public class Oyuncu : MonoBehaviour
{
void Start()
{
Debug.Log("Hazir");
}
}Explanation: Script classes derive from the MonoBehaviour base class; otherwise Unity does not accept them as components.
3 Parts of MonoBehaviour
| Term | Meaning |
|---|---|
MonoBehaviour |
The base class scripts derive from |
: MonoBehaviour |
The inheritance declaration |
void Start() |
A method Unity calls |
Debug.Log |
Writes text to the console |