How get a Component By Reference

Question

I have several instances of one prefab which have this PropertiesPrefab script attached:

 public class PropertiesPrefab : MonoBehaviour {
     
     public float health;
     
 }

In other script, i want to access to the health of the PropertiesPrefab script of the prefab:

 public class AnotherClass : MonoBehaviour 
 {
     PropertiesPrefab propsPrefab;
     
     void OnTriggerEnter(Collider other) 
     {
         propsPrefab = other.GetComponent<PropertiesPrefab>();
     }
     
     
     void OnTriggerStay (Collider other)
     {
         // Wrong value because is not referenced to the component
         Debug.Log(propsPrefab.health);
         
         // Right value
         Debug.Log(other.GetComponent<PropertiesPrefab>(). health);
     }
 }

The problem is that the debug.log sentences shows different values if the health has been changed. So the question is:

¿How can I get a component by reference, so when the health is changed, it also changes in the propsPrefab variable?

Answer 1

Answer by Bunny83 · Jan 16, 2018 at 06:01 PM

Your question is confusing. You do store a reference to the "PropertiesPrefabClass" script that has last entered the trigger. Are you sure there is only one object that is inside the trigger? You may want to use a proper Debug.Log statement like this:

 Debug.Log("Health(propsPrefab): " + propsPrefab.health + " Obj: " + propsPrefab.gameObject.name, propsPrefab.gameObject);

and

 Debug.Log("Health(other): " + other.GetComponent<PropertiesPrefabClass>(). health+ " Obj: " + other.gameObject.name, other.gameObject);

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Bunny83 · Jan 16, 2018 at 06:06 PM 0

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The second argument of Debug.Log allows you to specify a "context" object. When you click once on the log entry in the console Unity will highlight the context object in the project / hierarchy panel.

Roixo · Jan 16, 2018 at 06:11 PM 0

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Imagine I have 2 spheres colliding all the time. And another external script can modify the health of the Sphere 2 any time. I want to check inside the OnTriggerStay of the Sphere 1 if the health of the Sphere 2 has been changed, without doing other.GetComponent<PropertiesPrefab>().health; all the time, and just checking propsPrefab.health

myzzie Roixo · Jan 16, 2018 at 06:30 PM 0

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I just set it up, and everything is working fine. Script on plane deal damage to sphere 2. Sphere 1 holds the trigger stuff. and sphere 2 holds the health script.

 public TestHealth testHealth;

 void OnTriggerEnter(Collider col)
 {
     testHealth = col.GetComponent<TestHealth> ();
 }

 void OnTriggerStay(Collider col)
 {
     
     Debug.Log (testHealth.health);
 }

Roixo myzzie · Jan 16, 2018 at 06:37 PM 0

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For example, If the health is changed 3 seconds after the 2 spheres start colliding, in your log statement, after 3 seconds, you get the old healthvalue ins$$anonymous$$d of the new one .

Answer 2

Answer by smflt_nhn · Feb 08, 2021 at 03:10 AM

Assets that can be used to find references have been released.

You can find and fix missing components or references.

Image:

Visual display of asset relationships. alt text

Image:

Find detailed references to assets. It's a texture, but it's also script. alt text It's FREE! Please manage your assets conveniently and solve the problem of your project.

Detailed explanation is in the link below.

https://forum.unity.com/threads/free-released-assetmanagement-integrated-asset-management-system.1051568/

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How get a Component By Reference

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