How to Wait Number of Seconds?

Scripting
1

I have a piece of code here. I have a game object that contains a particle and I would Instantiate it and I want to pause or wait for number of seconds then Instantiate the other prefab I have. I have an idea of coroutine but I don’t know how to use it in the context I have. Help.

public class SpawnScript : MonoBehaviour
    {
        DectectableScript DS;
        ZoneManagerScript Zms;
        public GameObject MonsterPrefab;
        GameObject MonsterReference;
        public GameObject ParticleS;
        GameObject ParticlePrefab;
        SpawnScript SS;
        Vector3 Zone1 = new Vector3 (13f, 0f, -6.5f);
        Vector3 Zone2 = new Vector3 (6.44f, 0f, -6.5f);
        Vector3 Zone3 = new Vector3 (.05f, .0f, -6.5f);
        Vector3 Zone4 = new Vector3 (-6.53f, 0f, -6.5f); 
        Vector3 Zone5 = new Vector3 (-13.39f, 0f, -6.5f);
        public int SpawnLimit = 0;

        public bool IsInZone1;
        public bool IsInZone2;
        public bool IsInZone3;
        public bool IsInZone4;
        public bool IsInZone5;

        void Start()
        {
            IsInZone1 = false;
            IsInZone2 = false;
            IsInZone3 = false;
            IsInZone4 = false;
            IsInZone5 = false;
        }

        public void SpawnInZone1()
        {   

            GameObject ZMSObject = GameObject.FindGameObjectWithTag ("Zone Manager");
            Zms = ZMSObject.GetComponent<ZoneManagerScript>();

            DS = GetComponent<DectectableScript>();
            MonsterReference = GetComponent<DectectableScript>().Monster;

            if (Zms.Zone1Empty)
            {

                ParticlePrefab = Instantiate(ParticleS,Zone1,Quaternion.identity) as GameObject;

                MonsterPrefab = Instantiate(MonsterReference,Zone1,Quaternion.identity) as GameObject;

                Debug.Log("Monster Spawned In Zone 1");
                Zms.Zone1Empty = false;
                SpawnLimit ++;
                IsInZone1 = true;
            }

It’s in the if(Zms.Zone1Empty) statement.

2

use a coroutine

you’ll be yielding a WaitForSeconds object:

3

I Still don’t Understand. I Put it in the code, it doesn’t wait to spawn MonsterPrefab.

IEnumerator Example()
        {

            yield return new WaitForSeconds(3.2f);

        }



        public void SpawnInZone1()
        {  

            GameObject ZMSObject = GameObject.FindGameObjectWithTag ("Zone Manager");
            Zms = ZMSObject.GetComponent<ZoneManagerScript>();

            DS = GetComponent<DectectableScript>();
            MonsterReference = GetComponent<DectectableScript>().Monster;

            if (Zms.Zone1Empty)
            {

                ParticlePrefab = Instantiate(ParticleS,Zone1,Quaternion.identity) as GameObject;
                StartCoroutine(Example());
                MonsterPrefab = Instantiate(MonsterReference,Zone1,Quaternion.identity) as GameObject;

                Debug.Log("Monster Spawned In Zone 1");
                Zms.Zone1Empty = false;
                SpawnLimit ++;
                IsInZone1 = true;
            }
4

By creating an Coroutine, you can use a method called WaitForSeconds as a yield return statement, and specify for how many seconds you want to wait until the method continues to execute.

EDIT: Do you get an error?
EDIT 2: I would probably make it so that the entire Spawn monster code is in the Coroutine.

Something like:

    IEnumerator Example()
    {
        ParticlePrefab = Instantiate(ParticleS, Zone1, Quaternion.identity) as GameObject;
        yield return new WaitForSeconds(3.2f);
        MonsterPrefab = Instantiate(MonsterReference, Zone1, Quaternion.identity) as GameObject;
    }

Then you could start that coroutine when you needed to spawn the two objects, using StartCoroutine(Example());

EDIT 3: Here is a video tutorial about Coroutines:
https://unity3d.com/learn/tutorials/modules/intermediate/scripting/coroutines