unity C# run method from another class

Question

I want to run metod in the class from another class and both of them atached to different obj

Two classes. the first is:

public class NewScore: MonoBehaviour {
public void updateScoreBy( int intr) {
    Debug.Log("intr+4"+intr+4);
}
}

and the second is:

public class NewPlus: MonoBehaviour {
    public NewScore newscore;
public void OnTriggerEnter2D(Collider2D obj) {
    newscore.updateScoreBy(+1);
}
}

When I run my code I recive an arror "NullReferenceException: Object reference not set to an instance of an object" and it points on newscore.updateScoreBy(+1); How can I fix it?

Fabricio · Accepted Answer · 2014-04-21 14:58:06Z

1

You need to initialize public NewScore newscore;: drag drop the object that contains that script on that variable in the Inspector panel

answered Apr 21, 2014 at 14:58

Fabricio

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2 Comments

user2698308 Over a year ago

It doesn't drop on the place in inspector.

Fabricio Over a year ago

if you have one gameobject with NewScore and another with NewPlus you should be able to drag one object to another, on Inspector.

Tom · Accepted Answer · 2014-04-21 14:38:45Z

0

depending on what you want to do you could make the function static like:

public static void updateScoreBy(int intr)
{
    Debug.Log("intr+4"+intr+4);
}

and call it with:

NewScore.updateScoreBy(1);

answered Apr 21, 2014 at 14:38

Tom

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Comments

dogiordano · Accepted Answer · 2014-04-21 17:28:27Z

0

You didn't initialize newscore.

Change your NewPlus class like this so it will initialize newscore on construction.

public class NewPlus: MonoBehaviour {
  public NewScore newscore;
  public NewPlus(){
    newscore=NewScore();
  }
  public void OnTriggerEnter2D(Collider2D obj) {
    newscore.updateScoreBy(+1);
  }
}

answered Apr 21, 2014 at 17:28

dogiordano

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2 Comments

user2698308 Over a year ago

have you tried to do the same? doest'n work- shows an error on your fix

dogiordano Over a year ago

I don't know all the classes you are using. Does NewScore have a constructor with no arguments? If not, you are the one to know how to initialize it. I'm just telling you that you should initialize it in your constructor.

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