Instantiate without inheriting from MonoBehaviour

Question

I'm using a state machine. There is a "ClassName : FSMSystem" that is attached to a GameObject. Then I have "StateName : FSMState", but I can't use anything from MonoBehaviour in this state, only in the main FSMSystem class.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerScript : FSMSystem {
 
     // STATES
     public PlayerIdle S_PlayerIdle;
 
     void Awake()
     {
         AddState(S_PlayerIdle);
         S_PlayerIdle.Parent = this;
 
         GoToState(S_PlayerIdle);
     }
 }

FSMSystem inherits from MonoBehaviour, so it has access to Instantiate. FSMState does not. Here is an example state script:

 using UnityEngine;
 using System.Collections;
 
 [System.Serializable]
 public class PlayerIdle : FSMState {
 
     [System.NonSerialized]
     public PlayerScript Parent;
 
     public override void OnEnter()
     {
         
     }
 
     public override void OnUpdate()
     {
         
     }
 
     public override void OnExit()
     {
         
     }
 
 }

I can't make FSMState inherit from MonoBehaviour, so how do I get access to Instantiate/etc?

Answer 1

Best Answer

Answer by Stardog · Dec 04, 2012 at 12:48 AM

The solution was to use GameObject.Instantiate instead.

 GameObject instancedObj = GameObject.Instantiate(..., ..., ...) as GameObject;

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Owen-Reynolds · Dec 04, 2012 at 02:12 PM 2

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Or just `Object.Instantiate`. GameObject works since it's a type of Object. Since your Q specifically mentioned Monobehavior, you could even use that.

The trick is that Instantiate is a static, so you don't have to be an instance to use it.

m0nkeybl1tz · Jun 17, 2017 at 10:30 PM 0

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I know I'm about 5 years late to this party, but thank you! I was able to inherit from MonoBehaviour, but I wasn't able to create an instance of my class using "new". This totally solved it for me.

Answer 2

Answer by nventimiglia · Dec 03, 2012 at 08:38 PM

You can create new instances of non monobehaviours by using new.

public class NonMonoClass{}

void Awake(){ var myObject = new NonMonoClass(); }

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Instantiate without inheriting from MonoBehaviour

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