OnTriggerEnter2D isn't working

I am making a game on Android where you can draw straight lines, that acts as platforms, here's the code for this :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class LineSpawn : MonoBehaviour
6. {
7.     Vector2 firstPosition;
8.     Vector2 movePosition;
9.     LineRenderer lr;
10.     GameObject line;
11.     public float lineWidth = 5f;
12.     public int lineRoundCorners = 2;
13.     private BoxCollider2D lineCollider;
14.     private Touch touch;
15.  
16.     void Start()
17.     {
18.        
19.     }
20.  
21.     void Update()
22.     {
23.         if (Input.touchCount > 0)
24.         {
25.             touch = Input.GetTouch(0);
26.  
27.             if (touch.phase == TouchPhase.Began)
28.             {
29.                 Destroy(line);
30.                 lr = null;
31.  
32.                 firstPosition = Camera.main.ScreenToWorldPoint(touch.position);
33.                 movePosition = firstPosition;
34.  
35.                 line = new GameObject("Platform");
36.  
37.  
38.                 lr = line.AddComponent<LineRenderer>();
39.                 lr.enabled = true;
40.                 lr.positionCount = 2;
41.                 lr.SetPosition(0, firstPosition);
42.                 lr.SetPosition(1, firstPosition);
43.                 lr.useWorldSpace = true;
44.                 lr.numCapVertices = lineRoundCorners;
45.                 lr.widthMultiplier = lineWidth;
46.                 lr.startColor = Color.green;
47.                 lr.endColor = Color.green;
48.                 lr.sortingOrder = 1;
49.                 lr.material = new Material(Shader.Find("Sprites/Default"));
50.                
51.             }
52.  
53.             else if (touch.phase == TouchPhase.Moved)
54.             {
55.                 movePosition = Camera.main.ScreenToWorldPoint(touch.position);
56.  
57.                 lr.SetPosition(1, movePosition);
58.  
59.  
60.  
61.             }
62.  
63.             else if (touch.phase == TouchPhase.Ended)
64.             {
65.  
66.                 AddColliderToLine(lr, firstPosition, movePosition);
67.  
68.             }
69.         }
70.        
71.     }
72.  
73.     private void AddColliderToLine(LineRenderer line, Vector2 startPoint, Vector2 endPoint)
74.     {
75.         lineCollider = new GameObject("LineCollider").AddComponent<BoxCollider2D>();
76.         lineCollider.transform.parent = line.transform;
77.         float lineWidth = line.endWidth;
78.         float lineLength = Vector2.Distance(startPoint, endPoint);
79.         lineCollider.size = new Vector2(lineLength, lineWidth);
80.         Vector2 midPoint = (startPoint + endPoint) / 2;
81.         lineCollider.transform.position = midPoint;
82.  
83.        
84.         float angle = Mathf.Atan2((endPoint.y - startPoint.y), (endPoint.x - startPoint.x));
85.        
86.         angle *= Mathf.Rad2Deg;
87.  
88.         lineCollider.transform.Rotate(0, 0, angle);
89.     }
90.    
91. }
92.  

Now, I wanna add an enemy that you can kill by drawing a line on it, here the code :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class EnnemyScript : MonoBehaviour
6. {
7.     void Start()
8.     {
9.  
10.     }
11.  
12.     void Update()
13.     {
14.        
15.     }
16.  
17.     private void OnTriggerEnter2D(Collider2D other)
18.     {
19.             Debug.Log("TOUCHING");
20.     }
21. }
22.  
23.  

The OnTriggerEnter2D works fine with any other Colliders in my game, but it doesn't detect the BoxCollider2D LineCollider, even when I can see in Unity that the Collider2D of the ennemy and the line are touching each other. Does anyone have an idea of why this happens ?
Thank you for your help !

 

Do you have a ridigbody attached to the trigger? You can set it to the kinematic if you don't need physics interactions.

Also, check your https://docs.unity3d.com/Manual/class-PhysicsManager.html -> Contact Pair Mode.