Question by MyNameisNonono · Apr 01, 2020 at 05:54 AM · tower-defense

Tower Defense- cannot clone the tower

Hi, I played around with Unity a month ago and now I am following the tower-defense tutorial. Those tutorials is a bit advanced to me but I feel more excited to make a real game than work with some basic course. But I stuck at the "placing tower" step.

The github link: The source

The ideal is: When I click the button, I can clone the corresponding tower and place them anywhere on the map. alt text

I have two scripts:

List item

TowerBtn:

 using UnityEngine;
 
 public class TowerBtn : MonoBehaviour
 {
     
     [SerializeField]
     private GameObject towerObject;
 
     public GameObject TowerObject
     {
         get
         {
             return towerObject;
         }
     }
 
 }

It attaches to the button and I use the gameObject prefab (ex : the tower) alt text

List item

And Tower Manager:

 using UnityEngine;
 using UnityEngine.EventSystems;
 
 public class TowerManager : Singletons<TowerManager>
 { 
      private TowerBtn TowerBtnPressed= null;
 
     // Start is called before the first frame update
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetMouseButtonDown(0))
         {
             Vector2 worldpoint = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             RaycastHit2D hit = Physics2D.Raycast(worldpoint, Vector2.zero);
             placeTower(hit);
         }
     }
 
     public void placeTower(RaycastHit2D hit)
     {
         Debug.Log(TowerBtnPressed);
         if (!GetCurrent().IsPointerOverGameObject() && TowerBtnPressed != null)
         {
             GameObject newTower = Instantiate(TowerBtnPressed.TowerObject) as GameObject;
             newTower.transform.position = hit.transform.position;
         }
     }
 
     private static EventSystem GetCurrent()
     {
         return EventSystem.current;
     }
 
     public void SelectedTower(TowerBtn towerSelected)
     {
         TowerBtnPressed = towerSelected;
         Debug.Log(TowerBtnPressed);
         Debug.Log("Press!" + TowerBtnPressed.TowerObject);
     }
 }

Every time I press Button, The SelecTower function is called.

The problem: When I click to the map to clone the tower, nothing appears also, no errors. I did some research and found out:

When I click the button, the Debug.Log("Press!" +TowerBtnPressed) show that TowerBtnPressed = towerSelected. But the function placeTower() is useless since the TowerBtnPressed is always null.

alt text

When I change [private TowerBtn TowerBtnPressed= null;] to [ public TowerBtn TowerBtnPressed= null;], there are only 1 type of tower is clone( For example I have 3 type of tower-Tower1,tower2,tower3, but only tower1 eventhough I click 3 buttons)

@Cunningham620 : Hi, I found out you are the instructor, could you please help me.

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