[Solved]Calling function from all objects in level with same tag

Hi,

is there a way how to call function from script that is located in many on the level?
Let's say I wanna call public void Spawn() that is located in Spawner script inside SpawnPoint game object.

Thanks for any help.

 

Use a manager and delegates.


In C#, you can use a script as a variable, which this script can then access.


Example...

Code (csharp):

1.  
2. public spawnerScript[] spawners;
3.  
4.  
5. void mngInstructAllSpawners(){
6. for (int i = 0; i < spawners.Length; i++){
7. spanwers[i].spawn();
8. }
9.  

 

Just use FindGameObjectsWithTag to get an array of all objects with the tag, then iterate through the array and do GetComponent<Spawner>().Spawn() on each item.

--Eric

 

@Eric5h5 granted your method is more flexible, if the spawner count varies, but isn't getting the component of each object something to avoid? Just curious your thoughts in hit to the CPU.

 

Not really, but if you were going to do this frequently and the GameObjects don't change, you could store the components in an Spawner array and call the Spawn function directly.

--Eric

 

Hm.
I should look into cost of GetComponent on mobile. It could save me some serious micro management.

 

I don't understand how do I get them into that array? o.o

 

///manager script
contains public variable delegateScript[], delagateScripts.

Now, any objec with the component, delegateScript, can be added to the array, on the managers script. Simply drag and drop.

 

Hmmm I see, but is there a way how to add them by scripting? Since I want this to be bit more flexible. I was thinking about this code

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class StartingChoice : MonoBehaviour {
5.     SpeedField difficulty;
6.     Spawner spawner;
7.     GameObject[] spawnPoints;
8.     // Use this for initialization
9.     void Start () {
10.         difficulty = GameObject.Find ("SpeedField").GetComponent<SpeedField> ();
11.  
12.  
13.     }
14.     void OnGUI()
15.     {
16.         GUI.Label (new Rect (20, 100, 200, 50), "Choose difficulty");
17.                 if (GUI.Button (new Rect (40, 150, 100, 50), "Easy")) {
18.                         difficulty.easy = true;
19.             spawnPoints= GameObject.FindGameObjectsWithTag ("Spawn Detector");
20.             for(int i=0; i < spawnPoints.Length; i++)
21.             {
22.                 spawner = spawnPoints[i].GetComponent<Spawner>();
23.                 spawner.ReRoll();
24.                 spawner.CreateBlock();
25.  
26.  
27.             }
28.             Debug.Log (spawnPoints.Length);
29.             Destroy (gameObject);
30.  
31.         }
32.     }
33.     // Update is called once per frame
34.     void Update () {
35.  
36.     }
37. }
38.  

but it doesn't work for some reason.

Also this is error I am getting
NullReferenceException: Object reference not set to an instance of an object
StartingChoice.OnGUI () (at Assets/Scripts/StartingChoice.cs:23)

 

Nevermind I had bad tag used, thanks for your help anyway ^_^;