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How to change a sprite with a script Unity

I'm new to Unity and C#. I'm trying to make the sprite of "bird" change when he dies in unity. I tried following some tutorials but it doesn't work, so now I'm just trying to make the sprite change when "A" is pressed, but it still doesn't work. Is it a problem of the script or of the sprite?
Here is the code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ChangeSprite : MonoBehaviour
{
public Sprite deadBird;
void Start()
{
}
void Update()
{
if (Input.GetKeyDown(KeyCode.A))
{
GetComponent<SpriteRenderer>().sprite = deadBird;
}
}
}
Here is a screenshot: https://i.stack.imgur.com/PTd9W.png

I think #derHugo is correct, if you have an Animator then that will most likely overwrite any change you try and do. To fix this, you can use that animator and create an animation that is the deadBird. once you have that, connect it to the animator controller from the normal state. in that connection you can create and set a new animator boolean like "isDead" and set it to switch to the dead animation is the bool is true. then change your code from
GetComponent<SpriteRenderer>().sprite = deadBird;
To
anim = gameObject.GetComponent<Animator>() //place this instead of the bird sprite
anim.SetBool("isDead", true); //place this in the if statement
Hope that helps! it's much cleaner to go through the animator as it allows for easier changes as you build your game.

My characters in my 2D game do not collide even when i create 2D collider box

i want to make the characters in my game collide with objects around them and stop moving. the thing is the characters just spawn and keep walking down the map until they're out of the Canvas view.
my characters have Constantmove script that i assigned to them which is this one:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CharacterConstantMove : MonoBehaviour
{
GameManager Game_Manager;
void Start()
{
GameObject gameController = GameObject.FindGameObjectWithTag("GameController");
Game_Manager = gameController.GetComponent<GameManager>();
}
void Update()
{
transform.Translate(Game_Manager.moveVector * Game_Manager.moveSpeed * Time.deltaTime);
}
}
What do i do to make them stop around the desk and just stay idle when they collide there?

You are moving them with transform.Translate() function, which does not include physics. If you want them to collide, you would have to add Rigidbody2D component and move them using velocity property: https://docs.unity3d.com/ScriptReference/Rigidbody2D.html

Unity Transform not updating position realtime

I am trying to create a simple scriptable object for my shoot ability. I have that aspect working, but as I try to set my Transform to my player, it does not update the shoot position. I am very new to C#, and this script isnt complete. I still need to add the functionality to destroy the created objects. Any help would be greatly appreciated. I suspect I need to add an update function but im am not certain how to do this.
using UnityEngine.InputSystem;
using UnityEngine.AI;
using UnityEngine;
namespace EO.ARPGInput
{
[CreateAssetMenu]
public class Shoot : Ability
{
public Transform projectileSpawnPoint;
public GameObject projectilePrefab;
public float bulletSpeed = 10;
public float bulletLife = 3;
public override void Activate(GameObject parent)
{
var projectile = Instantiate(projectilePrefab, projectileSpawnPoint.position, projectileSpawnPoint.rotation);
projectile.GetComponent<Rigidbody>().velocity = projectileSpawnPoint.forward * bulletSpeed;
Destroy(projectile, bulletLife);
void OnCollisionEnter(Collision collision)
{
Destroy(projectile);
}
}
}
}

I'm still new to Unity and coding also, so take my advice with a load of salt :P.
It may be best to have a transform on your character (say just past the barrel of the player's gun) that you can put as the projectileSpawnPoint. In your code the projectileSpawnPoint is never set. Your first line of code in the "Activate" method should be something like:
public override void Activate(GameObject parent)
{
projectileSpawnPoint = playerGunBarrelTransform.transform.position;
var projectile = Instantiate(projectilePrefab, projectileSpawnPoint.position, projectileSpawnPoint.rotation);
projectile.GetComponent<Rigidbody>().velocity = projectileSpawnPoint.forward * bulletSpeed;
Destroy(projectile, bulletLife);
For destroying the projectile afterward you can keep it as you have it in OnCollision. howeer, with bullets in particular, since they tend to be instantiated A LOT and then destroyed afterward it would be best to use an object pooler for them to instantiate several of them on start and then disable and enable them as needed so you can resuse them instead of making new ones every time.

you have to create a new script that derives from Monobehaviour for your projectiles. attach that script to the projectile prefab and place the OnCollisionEnter method in that script. now your projectiles should get destroyed when touching another collider. make sure that there is a rigidbody component attached to the projectile.

Empty GameObject not deactivating

everyone.
Basically, I have a prefab with a canvas and an empty GameObject. This GameObject, PlayAd, contains its own canvas and a button to play ads and let the users skip a level. PlayAd's button is covering the other canvas's continue button, which is only supposed to be accessible if the user passes a level. All my script is supposed to do is deactivate PlayAd on trigger enter so the users can get to the continue button. However, it never goes away after I reach the trigger to cause this. Any help on this would be appreciated. Thank you.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class NewLevScript : MonoBehaviour
{
public GameObject PlayAd;
// Start is called before the first frame update
private void Start()
{
PlayAd = GameObject.Find("PlayAd");
}
private void OnTriggerEnter(Collider other)
{
if (other.tag == "Platyer")
{
PlayAd.SetActive(false);
}
}
}

Boy, do I feel dumb... I had to remove the "t". It works now.

How to fix "Can't Play a Disabled Audio Source"?

I am trying to add a sound into my game that whenever the player moves over a certain space it plays a crunch sound. I have created the AudioSource file and a .OGG file for the sound.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class SpaceBlue : MonoBehaviour
{
public Transform spaceNext;
public AudioSource stepOnObject;
public AudioClip stepOnSound;
private void Start()
{
stepOnObject.clip = stepOnSound;
stepOnObject.enabled = true;
}
private void OnTriggerEnter(Collider other)
{
if (other.tag == "Player")
{
stepOnObject.Play();
if (BoardScript.diceValue > 0)
{
BoardScript.diceValue -= 1;
Debug.Log("The dice are now " +BoardScript.diceValue);
other.transform.LookAt(spaceNext);
}
}
}
}
I have included the source and clip to my game object and i have tried it both with and without "Play on wake" selected.
Whenever the play walks over the player walks over the object i get a warning in the unity engine saying that the source is disabled.
Any help is appreciated :)

I had a similar problem and I fixed it by changing the location of the Play() call to after calling Destroy(GameObject). I would recommend trying moving the call to Play() to the end of the function, or trying Invoke("stepOnObject.Play", 0.5f); to ensure it gets called.
Otherwise, make sure its checkbox is ticked, and that the AudioSource actually has a AudioClip attached.

If you have any piece of code in some other script that Destroys this game object or makes SetActive false, then the best way to solve this problem will be to delay that piece of code by some time using a Coroutine.