Unity：数组中的几个gameObjects（？）

Question

i'm making this beat 'em up game on unity that has the following mechanism: when the player's collider hits an enemy's:

public GameObject obj;
...

void OnTriggerEnter(Collider collider){
obj=collider.gameObject;
}

Then, when the player attacks, if its distance to the obj is small enough, the enemy receives damage:

void hit(){
    if(kicked&&close){  //if he is kicking and is close enough
        obj.GetComponent<health>().DealDamage(damage); //this is inside a try/catch, just in case obj=null
(...)
}

The problem is, if 2 enemies touch the player, only the last one will be assigned to the variable obj, so he will take the hit alone, which i don't want to happen.

Any suggestions? Should i replace

GameObject obj;

with an array? How is that?

and then, on the OnTriggerEnter method, add objects to the array? (how to do that?)

Answer 1

One simple way is to have your player holding a trigger box. When the enemies enter the trigger box, they get added to a collection and removed when exiting:

public class PlayerAttack:MonoBehaviour
{
    private HashSet<Enemy> list = null;
    private void Awake(){ this.list = new HashSet<Enemy>(); }
    private void OnTriggerEnter(Collider col)
    {
         Enemy enemy = col.transform.GetComponent<Enemy>();
         if(enemy != null)
         {
             this.list.Add(enemy);  
         } 
    }
    private void OnTriggerExit(Collider col)
    {
         Enemy enemy = col.transform.GetComponent<Enemy>();
         if(enemy != null && this.list.Contains(enemy) == true)
         { 
             this.list.Remove(enemy);  
         } 
    }
    public void OnAttack()
    {
         foreach(Enemy enemy in this.list)
         { 
            enemy.GetComponent<Health>.DealDamage(damage); 
         }
    }
}

OnAttack is your attack method that will iterate through all close enemies. HashSet is a good candidate here as it won't add twice the same item so no risk of seeing an enemy getting multiple hits.

Answer 2

I didn't manage to solve the problem. The damage never gets to be assigned.

private HashSet<Enemy> list = null;

private void Awake(){this.list = new HashSet<Enemy>();}

void OnTriggerEnter(Collider col){

     Enemy enemy = col.transform.GetComponent<Enemy>();
     print(enemy); // this occurs
     if(enemy != null && this.list.Contains(enemy) == true)
     { 
        print(enemy); // this never occurs
         this.list.Remove(enemy);  
     } 
    }
    }


void hit(){      
    print("hit"); // this occurs

    foreach(Enemy enemy in this.list)
     {   // this never occurs
        enemy.GetComponent<health>().DealDamage(damage); 
     }

@Everts

Answer 3

You have the lists of all objects on screen as enemies, trees, boxes etc.
And in endless cycle you do some actions with all objects:

while(true)
{
    // Here non combat characters do something.
    foreach(NonCombatCharacter character in NonCombatCharacters)
    {
        switch(character.Type)
        {
            case tinyBird: character.DoAction(Actions.Fly); break;
            case ...
            default:break;
        }
    }
    // Here your combat character aka enemies
    foreach(CombatCharacter character in CombatCharacters)
    {
        // Here you do your combat logic, cheks and etc.
    }
    // And then you player character change the world model, here you
    // process all player action such as changing position, losing hp.
    // And then world keep lifecycle again
}

EDIT: So there is global arrays foreach object. In unity you got them too, even if you dont create the array.
Here you go:
https://docs.unity3d.com/ScriptReference/Object.FindObjectsOfType.html
Use documentation, most of common answers are all there.