I can store a GameObject within a variable with something like:
GameObject Target = SomeGameobject;
How do i do that for a script?
SomeVariableDefinition TargetStatus = Target.GetComponent<Status>();
What is the variable? Is there such a thing?
Thanks in advance, Sorry for the bad english.
Just like to store a game-object, you can also save any script.
GameObject Target = SomeGameobject; //Gameobject sotre
You need to remeber always that game-object is also a script.
Status TargetStatus = Target.GetComponent<Status>();//Status script ref store in TargetStatus Variable
Variable type should need to be compatible with assigned object type(in our case script name)
I assume you are asking how to get a reference of a script that is attached to another GameObject.
You are almost correct. The type on the left and the type in the GetComponent must match.
SomeVariableDefinition TargetStatus = Target.GetComponent<SomeVariableDefinition>();
OR
Status TargetStatus = Target.GetComponent<Status>();
Understand that if the Target GameObject does not have that script you want to access, it will return null.
Below is full Example of how to access Another script instance, variable or function from another script.
public class ScriptA : MonoBehaviour{
public int playerScore = 0;
void Start()
{
}
public void doSomething()
{
}
}
Now, you can access variable playerScore in ScriptA from ScriptB.
public class ScriptB : MonoBehaviour{
ScriptA scriptInstance = null;
void Start()
{
GameObject tempObj = GameObject.Find("NameOfGameObjectScriptAIsAttachedTo");
scriptInstance = tempObj.GetComponent<ScriptA>();
//Access playerScore variable from ScriptA
scriptInstance.playerScore = 5;
//Call doSomething() function from ScriptA
scriptInstance.doSomething();
}
}
Related
How do I assign a gameObject of one script through another script's gameObject? For example;
Script_1
public class Script_1 : MonoBehaviour
{
public OVRScript OVR;
}
Script_2
public class Script_2 : MonoBehaviour
{
private Script_1 src_1;
public GameObject Front;
void Start()
{
src_1 = (Script_1) GameObject.FindObjectOfType(typeof(Script_1));
src_1.GetComponent<OVRScript >().OVR = Front //I am facing problem here
}
}
Both GameObjects "OVR" and "Front" contain the OVRScript
src_1.GetComponent<OVRScript>().OVR = Front.GetComponent<OVRScript>().OVR;
I don't know or see the OVRScript class but isn't OVR rather a member of Script_1?
And then you would want to use GetComponent on the Front in order to get a component attached to it.
// If possible rather drag your Script_1 in here directly via the Inspector
[SeializeField] private Script_1 src_1;
void Start()
{
// Now I would use find only as fallback
if(!scr_1) src_1 = GameObject.FindObjectOfType<Script_1>();
// then you want to assign the OVR field of the 'src_1' of type 'Script_1'
// and not use 'src_1.GetComponent<OVRScript>()' which would return
// the reference of an 'OVRScript' component attached to the same GameObject as the Script_1
//
// And you want to fill it with the reference of an 'OVRScript' attached to 'Front'
src_1.OVR = Front.GetComponent<OVRScript>();
}
(see [SerializeField])
It would be even better if you directly define
public OVRScript Front;
now if you drag in a GameObject it a) is checked if this GameObject actually has a OVRScript attached, otherwise you can't drop it and b) instead of the GameObject reference already the OVRScript reference is serialized and stored so there is no need for GetComponent anymore:
[SeializeField] private Script_1 src_1;
public OVRScript Front;
void Start()
{
// Now I would use find only as fallback
if(!scr_1) src_1 = GameObject.FindObjectOfType<Script_1>();
src_1.OVR = Front;
}
This question already has answers here:
In Unity, how can I pass values from one script to another?
(4 answers)
Closed 1 year ago.
Can you tell me how to access a variable of a script from another script ? I have even read everything in unity website but I still can’t do it. I know how to access another object but not another variable.
This is the situation :
I’m in script B and I want to access the variable X from script A. The variable X is boolean.
Can you help me ?
Btw i need to update X’s value costantly in script B , how do I do that ? Access it in Update function
If you could give me and example with these letters would be great !
Thank you
You first need to get the script component of the variable, and if they're in different game objects, you'll need to pass the Game Object as a reference in the inspector.
For example, I have scriptA.cs in GameObject A and scriptB.cs in GameObject B:
scriptA.cs
// make sure its type is public so you can access it later on
public bool X = false;
scriptB.cs
public GameObject a; // you will need this if scriptB is in another GameObject
// if not, you can omit this
// you'll realize in the inspector a field GameObject will appear
// assign it just by dragging the game object there
public scriptA script; // this will be the container of the script
void Start(){
// first you need to get the script component from game object A
// getComponent can get any components, rigidbody, collider, etc from a game object
// giving it <scriptA> meaning you want to get a component with type scriptA
// note that if your script is not from another game object, you don't need "a."
// script = a.gameObject.getComponent<scriptA>(); <-- this is a bit wrong, thanks to user2320445 for spotting that
// don't need .gameObject because a itself is already a gameObject
script = a.getComponent<scriptA>();
}
void Update(){
// and you can access the variable like this
// even modifying it works
script.X = true;
}
just for completing the first answer
there is no need for
a.gameObject.getComponent<scriptA>();
a is already a GameObject so this will do
a.getComponent<scriptA>();
and if the variable you are trying to access is in children of the GameObject you should use
a.GetComponentInChildren<scriptA>();
and if you need a variable of it or method you can access it like this
a.GetComponentInChildren<scriptA>().nameofyourvar;
a.GetComponentInChildren<scriptA>().nameofyourmethod(Methodparams);
You can use static here.
here is the example:
ScriptA.cs
Class ScriptA : MonoBehaviour{
public static bool X = false;
}
ScriptB.cs
Class ScriptB : MonoBehaviour{
void Update() {
bool AccesingX = ScriptA.X;
// or you can do this also
ScriptA.X = true;
}
}
OR
ScriptA.cs
Class ScriptA : MonoBehaviour{
//you are actually creating instance of this class to access variable.
public static ScriptA instance;
void Awake(){
// give reference to created object.
instance = this;
}
// by this way you can access non-static members also.
public bool X = false;
}
ScriptB.cs
Class ScriptB : MonoBehaviour{
void Update() {
bool AccesingX = ScriptA.instance.X;
// or you can do this also
ScriptA.instance.X = true;
}
}
for more detail, you can refer singleton class.
So im trying to change a variable in another script by touching a cube.
Current setup
1x Player
1x Enemy
Each with their own script Enemy_Stats & Character_Stats
As you can see in this little snippet it's quite a workaround to access the variable from another script.
void OnCollisionEnter(Collision collision)
{
if (collision.gameObject.tag == "Enemy")
{
collision.gameObject.GetComponent<Enemy_Stats>().Health =
collision.gameObject.GetComponent<Enemy_Stats>().Health
- gameObject.GetComponent<Character_Stats>().AttackDamage;
if (collision.gameObject.GetComponent<Enemy_Stats>().Health <= 0)
{
Destroy(collision.gameObject);
}
}
}
Iam new to Unity, but isn't there a way to just refer it with something like:
collision.Health?
How to access variables/functions from another Class. The variable or function you want to access or called must be public not private.
public class ScriptA : MonoBehaviour{
public int playerScore = 0;
void Start()
{
}
public void doSomething()
{
}
}
Access variable playerScore in ScriptA from ScriptB. First, find the GameObject that the script or component is attached to with the GameObject.Find function then use the GetComponent function to retrieve that script or component that is attached to it.
public class ScriptB : MonoBehaviour{
ScriptA scriptInstance = null;
void Start()
{
GameObject tempObj = GameObject.Find("NameOfGameObjectScriptAIsAttachedTo");
scriptInstance = tempObj.GetComponent<ScriptA>();
//Access playerScore variable from ScriptA
scriptInstance.playerScore = 5;
//Call doSomething() function from ScriptA
scriptInstance.doSomething();
}
}
No since Health is not part of the collision object, but Enemy_Stats. You can cache a Component (that's what Enemy_Stats is) if you use it multiple times to save you some typing (and some performance, but that is rather marginal for this example). Also you can cache "known" components like in this case Player_Stats. You can do this e.g. in Start or with a public variable and the inspector.
What you should probably do though is to make the enemy be responsible for his life and not the player, so move the Destroy-part to Enemy_Stats (into the Health property to be exact).
The first thing to make this shorter (and eventually faster) would be to store this: gameObject.GetComponent<Character_Stats>() on Start() in a private variable (you should avoid calling GetComponent on a frequent basis if you can avoid it).
For the Health variable, a way of avoiding GetComponent calls could be caching: you create a Dictionary<GameObject, Enemy_Stats> and read from that as soon as this gameobject collided once
At the very beginning i mean in Awake() method you can find a game-object with tag
and get it's Heath after that in Collision() method you should just decrease the health but, here the condition is there is only one enemy and only one player.
I want something like this.
ComponentTest.cs - This script is attached to a empty game object in the scene.
public class ComponentTest : MonoBehaviour {
public GameObject boxPrefab;
void Start () {
GameObject temp = Instantiate(boxPrefab, new Vector3(0,0,0), Quaternion.identity) as GameObject;
temp.GetComponent<PrefabBox> ().go = gameObject.GetComponent<ComponentTest>().Yes();
}
public void Yes(){
print("yes");
}
}
and PrefabBox.cs - This script is attached to the prefab.
public class PrefabBox : MonoBehaviour {
public GameObject go;
void Start () {
go ();
}
}
I get this as error:
The member `PrefabBox.go' cannot be used as method or delegate
First of all, the go object is declared as a GameObject but then you assign a function to it and then call it like a function.
It looks like you want Closures in which you can store functions to variables and call them in the way you do.
This post covers it: http://answers.unity3d.com/questions/494640/capturing-a-variable-in-a-closure-behaves-differen.html
Seems the data type needs to be Action but best to read up on it to grasp it properly.
Good luck.
For example I have a variable (public static float currentLife) in script "HealthBarGUI1" and I want to use this variable in another script.
How do I pass variable from one script to another C# Unity 2D?
You could do something like this, because currentLife is more related to the player than to the gui:
class Player {
private int currentLife = 100;
public int CurrentLife {
get { return currentLife; }
set { currentLife = value; }
}
}
And your HealthBar could access the currentLife in two ways.
1) Use a public variable from type GameObject where you just drag'n'drop your Player from the Hierarchy into the new field on your script component in the inspector.
class HealthBarGUI1 {
public GameObject player;
private Player playerScript;
void Start() {
playerScript = (Player)player.GetComponent(typeof(Player));
Debug.Log(playerscript.CurrentLife);
}
}
2) The automatic way is achieved through the use of find. It's a little slower but if not used too often, it's okay.
class HealthBarGUI1 {
private Player player;
void Start() {
player = (Player)GameObject.Find("NameOfYourPlayerObject").GetComponent(typeof(Player));
Debug.Log(player.CurrentLife);
}
}
I wouldn't make the currentLife variable of your player or any other creature static. That would mean, that all instances of such an object share the same currentLife. But I guess they all have their own life value, right?
In object orientation most variables should be private, for security and simplicity reasons. They can then be made accessible trough the use of getter and setter methods.
What I meant by the top sentence, is that you also would like to group things in oop in a very natural way. The player has a life value? Write into the player class! Afterwards you can make the value accessible for other objects.
Sources:
https://www.youtube.com/watch?v=46ZjAwBF2T8
http://docs.unity3d.com/Documentation/ScriptReference/GameObject.Find.html
http://docs.unity3d.com/Documentation/ScriptReference/GameObject.GetComponent.html
You can just access it with:
HealthBarGUI1.currentLife
I'm assuming that HealthBarGUI1 is the name of your MonoBehaviour script.
If your variable is not static and the 2 scripts are located on the same GameObject you can do something like this:
gameObject.GetComponent<HealthBarGUI1>().varname;
//Drag your object that includes the HealthBarGUI1 script to yourSceondObject place in the inspector.
public GameObject yourSecondObject;
class yourScript{
//Declare your var and set it to your var from the second script.
float Name = yourSecondObject.GetComponent<HealthBarGUI1>().currentLife;
}
TRY THIS!
//Drag your object that includes the HealthBarGUI1 script to yourSceondObject place in the inspector.
public GameObject yourSecondObject;
class yourScript{
//Declare your var and set it to your var from the second script.
float Name = yourSecondObject.GetComponent<HealthBarGUI1>().currentLife;