Get And Set problem

Question

Hi, im not familiar with getters and setters. I'm trying to implement it in my script. But when I try to acces the variable I get t$$anonymous$$s Warning and the variabe Im trying to acces doesn't change.

The code I'm trying to acces:

 public class FFAOpMovement : MonoBehaviour {
 
     private float xPos;
     public float XPos{
         get { return xPos; }
         set { xPos = value; }
     }
 
     // Use t$$anonymous$$s for initialization
     void Start () {
 
     }
     
     // Update is called once per frame
     void Update () {
         Debug.Log (xPos);
     }
 }

Trying to acces the code with:

 public class toolTest : MonoBehaviour {
 
     FFAOpMovement ffaop = new FFAOpMovement();
 
     // Use t$$anonymous$$s for initialization
     void Awake () {
         ffaop.XPos = 3f;
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 }

The warning i get:

You are trying to create a MonoBehaviour using the 'new' keyword. T$$anonymous$$s is not allowed. MonoBehaviours can only be added using AddComponent(). Alternatively, your script can inherit from ScriptableObject or no base class at all

Answer 1

Read the error message. You can't make MonoBehvaiour objects using the new keyword, w$$anonymous$$ch is what you tried to do in the second code segment. The message even gives you a suggestion of how to fix it.

Why can't you do t$$anonymous$$s? Because of the structure of Unity. Unity attaches scripts to GameObjects. In doing so, it allows the underlying engine to access those scripts and run the various built-in methods like the Update loops. The reason you can't make one with the new keyword (e.g. new Script()) is because you never specify what it should be attached to - it's not part of any GameObject. Unity cannot access the built-in methods now, and so there's no purpose to it being a MonoBehaviour in the first place (since that's the only benefit you get from that).

Instead of t$$anonymous$$s, Unity offers the AddComponent method, w$$anonymous$$ch allows you to attach a new component to a specified GameObject. T$$anonymous$$s means you specify w$$anonymous$$ch object the script is attached to, and so Unity can access it, because it is part of the scene. Unity can't arbitrarily hop around your code looking for every MonoBehaviour you've instantiated - it needs you to put it in the scene, attached to a GameObject.

I suggest, in future, you actually read the errors and warnings you get. When programming, they are one of the most helpful tools you will get for solving problems.

Get And Set problem

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