InvokeRepeating problem - apple spawn in snake 2D game

Hello!
I want to make food spawner but have problem with this script because it spawn food all time every 4 seconds.
I want to have only one prefab in scene and when I destroy it then want to have another one.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class AppleSpawner : MonoBehaviour {
5.  
6.     // Food Prefab
7.     public GameObject foodPrefab;
8.    
9.     // Borders
10.     public Transform borderTop;
11.     public Transform borderBottom;
12.     public Transform borderLeft;
13.     public Transform borderRight;
14.    
15.     // Use this for initialization
16.     void Start () {
17.         // Spawn food every 4 seconds, starting in 3
18.        
19.             InvokeRepeating ("Spawn", 4, 3);
20.        
21.  
22.     }
23.  
24.     void Update()
25.     {
26.  
27.     }
28.    
29.     // Spawn one piece of food
30.     void Spawn() {
31.         // x position between left & right border
32.         int x = (int)Random.Range(borderLeft.position.x+1f,
33.                                   borderRight.position.x-1f);
34.        
35.         // y position between top & bottom border
36.         int y = (int)Random.Range(borderBottom.position.y+0.5f,
37.                                   borderTop.position.y-0.5f);
38.        
39.         // Instantiate the food at (x, y)
40.         Instantiate(foodPrefab,
41.                     new Vector2(x, y),
42.                     Quaternion.identity); // default rotation
43.     }

I tried already with this:

Code (CSharp):

1. if (GameObject.Find ("apple(Clone)") == null) {
2.             InvokeRepeating ("Spawn", 1, 1);
3.   }

but not working ;/
Thanks for help!

 

You would have to add the null checker part of the scrip[t to your Invoke Method. Something like this:

Code (CSharp):

1.   void Spawn() {
2.         // x position between left & right border
3.         int x = (int)Random.Range(borderLeft.position.x+1f,
4.                                   borderRight.position.x-1f);
5.  
6.         // y position between top & bottom border
7.         int y = (int)Random.Range(borderBottom.position.y+0.5f,
8.                                   borderTop.position.y-0.5f);
9.  
10.         // Instantiate the food at (x, y)
11. if (GameObject.Find ("apple(Clone)") == null) {
12.         Instantiate(foodPrefab,
13.                     new Vector2(x, y),
14.                     Quaternion.identity); // default rotation
15.          }
16.     }

This new code should work!

 

Thank you so much!

 

You should avoid using destroy and practice with recycling objects. Just turn the object off when it is picked up and check every x seconds if it is activated or not. If not, you simply turn it on again.

 

Yeah I was going to mention this to but I figured I might as well solve your original problem first. This is a good idea though, and it also saves on a lot of game memory because it doesn't have to run as many commands.