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How to make a GameObject show after an animation in Unity

I'm creating a 2D in in Unity and I have a loading screen, that it's working (the loading animation). What I want to do next is to make the next screen appear (it's a gameobject), after a certain time.
Right now, my code is:
public RectTransform mainIcon;
public float timeStep;
public float oneStepAngle;
float startTime;
// Start is called before the first frame update
void Start()
{
startTime = Time.time;
}
// Update is called once per frame
void Update()
{
if (Time.time - startTime >= timeStep) {
Vector3 iconAngle = mainIcon.localEulerAngles;
iconAngle.z += oneStepAngle;
mainIcon.localEulerAngles = iconAngle;
startTime = Time.time;
}
}
what should I do now? Thank you

go to your game object that plays animation > create new script and ignore on start & update > Add this code
// object that would appear after animaton
public GameObject obj;
void showGameObject(){
objSetActive(true);
}
go back to your object that plays animation then add game object that will appear > go to animation controller on same object > select animation that our object will appear after > add animation event > in inspector you should have this > select function showGameObject

You could use a simple timer like e.g.
public RectTransform mainIcon;
public float anglePerSecond = 90f;
public float duration;
public string nextScene;
private float timer;
// Update is called once per frame
void Update()
{
mainIcon.Rotate(Vector3.forward * anglePerSecond * Time.deltaTime);
timer += Time.deltaTime;
if(timer >= duration)
{
SceneManager.LoadScene(nextScene);
}
}

Prevent a player from spamming a key in C# (Unity)

I am currently doing the tutorial learn with code from unity, in this section there are bonus challenges, that do not help you in resolving it. It says that i have to prevent the player from spamming the spacebar key to spawn dogs.
I am new to C#, i started to looking online but i see something about CoRoutines and i still dont know what that is, is there a simple way to do this, searching online i found something like this, but i cant make it work.
I also tried to make some conditional like canSpawn but i do not know how to implement it well, and Unity gives me an error that i cant use && between a bool and a keypress event
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerControllerX : MonoBehaviour
{
public GameObject dogPrefab;
public float time = 2.0f;
public float timer = Time.time;
// Update is called once per frame
void Update()
{
timer -= Time.deltaTime;
if (timer > time)
{
// On spacebar press, send dog
if (Input.GetKeyDown(KeyCode.Space))
{
spawnDog();
}
timer = time;
}
void spawnDog()
{
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
}
}

You were close. One thing that might make it easier to understand the logic, is to just count up instead of trying to count down. So, in your case, the code would look like this:
void Update ( )
{
timer += Time.deltaTime;
if ( timer >= time )
{
if ( Input.GetKeyDown ( KeyCode.Space ) )
{
spawnDog ( );
timer = 0;
}
}
}
void spawnDog ( )
{
Instantiate ( dogPrefab, transform.position, dogPrefab.transform.rotation );
}
The timer keeps being added to, and when it's greater than your time value (in this case 2.0f), it allows you to press a key. IF a key is then pressed, the timer is reset to 0, and the player needs to wait time time (2.0f) before being able to press the space key again.

I used Coroutines for this task, it has a little bit more code but it works nicely.
public class PlayerControllerX : MonoBehaviour
{
public GameObject dogPrefab;
private bool isCoolDown = false;
private float coolDown = 1f;
private void Update( )
{
if (Input.GetKeyDown(KeyCode.Space))
{
if (isCoolDown == false)
{
SpawnDog( );
StartCoroutine(CoolDown( ));
}
}
}
IEnumerator CoolDown( )
{
isCoolDown = true;
yield return new WaitForSeconds(coolDown);
isCoolDown = false;
}
private void SpawnDog( )
{
Instantiated(dogPrefab, transform.position, dogPrefab.transform.rotation);
}
}

I am using my phone. I am sorry if i made some syntax error.
bool isReadyForInstantiate;
void Start(){
isReadyForInstantiate = true;
}
void Update(){
if(isReadyForInstantiate && Input.GetKeyDown(KeyCode.Space)){
StartCoroutine(PreventSpam());
Instantiate(dogPrefab, transform.position, Quaternion.identity);
}
}
IEnumerator PreventSpam(){
isReadyForInstantiate = false;
yield return new WaitForSeconds(2);
isReadyForInstantiate = true;
}

here my solution based on a StopWatch:
using UnityEngine;
using System.Diagnostics; // hides UnityEngine.Debug. if needed use qualified call
public class PlayerControllerX : MonoBehaviour
{
public GameObject dogPrefab;
public double dogDelayMillis = 2000d;
private Stopwatch stopWatch;
private void Start()
{
stopWatch = new Stopwatch();
}
private void Update()
{
if (Input.GetKeyDown(KeyCode.Space))
{
if (stopWatch.IsRunning)
{
if (stopWatch.Elapsed.TotalMilliseconds > dogDelayMillis)
{
stopWatch.Reset();
SpawnDog();
}
}
else
{
SpawnDog();
}
}
}
private void SpawnDog()
{
stopWatch.Start();
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
}
}

Another example just for fun
public GameObject dogPrefab;
[Range(0f,2f)]
private float timer = 1.0f;
private float waitTime = 1.0f;
// Update is called once per frame
void Update()
{
// Delay Input Timer - only execute the spacebar command if timer has caught up with waitTime
if (timer < waitTime)
{}
// On spacebar press, send dog
else if (Input.GetKeyDown(KeyCode.Space))
{
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
// Resets Timer
timer = 0;
}
// Run Timer every frame
timer += Time.deltaTime;
Debug.Log(timer);
}
}

I was stuck on the same exact thing, thank you. The code below is what I went with because it's short and sweet.
public GameObject dogPrefab;
[Range(0f,2f)]
private float timer = 1.0f;
private float waitTime = 1.0f;
// Update is called once per frame
void Update()
{
// Delay Input Timer - only execute the spacebar command if timer has caught up with waitTime
if (timer < waitTime)
{}
// On spacebar press, send dog
else if (Input.GetKeyDown(KeyCode.Space))
{
Instantiate(dogPrefab, transform.position, dogPrefab.transform.rotation);
// Resets Timer
timer = 0;
}
// Run Timer every frame
timer += Time.deltaTime;
Debug.Log(timer);
}
}

Unity power-up is not working as intended

First off, I am quite new to scripting so there's probably going to be a few flaws in my script.
So basically, I've made a script for the power up, but once my shot or the player touches the power up coin the fire rate does increase however it won't go back to the normal fire rate after 5 seconds... I have no idea what might be the cause, any advice would be helpful!
using UnityEngine;
using System.Collections;
public class FireRatePowerUp : MonoBehaviour {
private bool isPowerUp = false;
private float powerUpTime = 5.0f;
private PlayerShoot playerShoot;
private void Start()
{
playerShoot = PlayerShoot.FindObjectOfType<PlayerShoot>();
}
private void OnTriggerEnter2D(Collider2D collision)
{
if (collision.gameObject.tag == "Player" || collision.gameObject.tag == "Projectile")
{
StartCoroutine(PowerUpTime());
isPowerUp = true;
Destroy(gameObject);
if (collision.gameObject.tag == "Projectile")
{
Destroy(collision.gameObject);
}
}
}
IEnumerator PowerUpTime()
{
playerShoot.fireRate -= 0.13f;
yield return new WaitForSeconds(powerUpTime);
playerShoot.fireRate += 0.13f;
}
}

I think the issue here is that you're destroying the gameobject this script is attached to (the coin) and by so doing, the script itself is destroyed, therefor its code, coroutine or otherwise won't execute.
StartCoroutine(PowerUpTime());
isPowerUp = true;
Destroy(gameObject); //oops, our script has been destroyed :(
You would have to do this very differently, basically moving the bulk of the code to the PlayerShoot class.
Something like this (this being in PlayerShoot.cs)
public void ActivatePowerupFireRate(float time, float amt) {
StartCoroutine(DoActivatePowerupFireRate(time, amt));
}
public IEnumerator ActivatePowerupFireRate(float time, float amt) {
fireRate -= amt;
yield return WaitForSeconds(time);
fireRate += amt;
}

IEumerator is definately one of the ways you can solve this issue.
However I'm not a fan of them here's my solution if you have a timer in game.
public int timePassed = 0;
public int gotPowerUp = 0;
void Start(){
InvokeRepeating("Timer", 0f, 1.0f);
//Starting at 0 seconds, every second call Timer function.
}
void Timer(){
timePassed++; // +1 second.
}
That way when you obtained the powerup you can set gotPowerUp = timePassed. So you have the exact time when powerup is activated.
then you do something like
if( (gotPowerUp + 5) == timePassed ){
//5 seconds have passed.
//deactivate powerup here
}

Unity How to limit Spawner?

I am working on a game like 2 cars. So there will be two lines and I have used two object spawner which is going to spawn two shapes, i,e Circle and Square. So when player collides with circle score should update. And when Square falls player is supposed to avoid it by going to another lane. But what is the problem is something both the spawner spawns square simultaneously or with small gap. So player is not able to escape. Any solution for this. Well I guess it does not help much but here is my script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Instantiter : MonoBehaviour {
public GameObject[] gameobject;
public float SpawnDelay= 3f;
private GameObject objectkeeper;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
float Spawntime = SpawnDelay * Time.deltaTime; // 1 *1/60
if (Random.value < Spawntime) {
Spawn ();
}
}
void Spawn(){
int number = Random.Range (0, 2);// creating random number between 0 and 1
objectkeeper = Instantiate (gameobject [number], this.transform.position, Quaternion.identity) as GameObject;
objectkeeper.transform.parent = this.transform;
}
void OnDrawGizmos(){
Gizmos.DrawWireSphere (this.transform.position, 0.5f);
}
}
Thank you for your time and consideration

Try this,
It will only spawn one object at a time between the min-max period
It does not cleanup old objects
It allows for more than 2 prefabs
I tried keeping to your code format as much as possible
Disclaimer : I do not currently have a visual studio/mono develop open (in a boring meeting) so i have not tested this :]
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Instantiter : MonoBehaviour {
public GameObject[] prefabs;
// Adding a min-max allows full control of spawning behaviour without editing code again.
// for a fixed time use the same value
public float MinimumSpawnDelay = 3f;
public float MaximumSpawnDelay = 6f;
private GameObject spawnedObject;
// Made this static so it retains it's value across all instances of this script.
// If you want each Instantiter object to function on it's own, remove the static keyword
private static float nextSpawnTime;
// Use this for initialization
void Start () {
// Artificial delay so we do not spawn an object directly at startup
SetNextSpawnTime();
}
// Update is called once per frame
void Update () {
if (Time.time >= nextSpawnTime) {
Spawn ();
}
}
void Spawn(){
// allows you to add more objects to the prefabs array without changing code.
var prefabToSpawn = prefabs[Ranom.Range(0, prefabs.Length)];
spawnedObject = Instantiate (prefabToSpawn, transform.position, Quaternion.identity);
spawnedObject.transform.parent = transform;
SetNextSpawnTime();
}
void OnDrawGizmos() {
Gizmos.DrawWireSphere (transform.position, 0.5f);
}
void SetNextSpawnTime(){
// a simple variable to hold when we should spawn another object, efficient.
nextSpawnTime = Time.time + Random.Range(MinimumSpawnDelay, MaximumSpawnDelay);
}
}

Try using a static variable -
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Instantiter : MonoBehaviour {
public GameObject[] gameobject;
public float SpawnDelay= 3f;
private GameObject objectkeeper;
// Static variable shared across all instances of this script
public static float nextSpawn = 0f;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
// check if SpawnDelay duration has passed
if (Time.time >= nextSpawn) {
// Now spawn after ramdom time
float Spawntime = SpawnDelay * Time.deltaTime; // 1 *1/60
if (Random.value < Spawntime) {
Spawn ();
}
}
}
void Spawn(){
int number = Random.Range (0, 2);// creating random number between 0 and 1
objectkeeper = Instantiate (gameobject [number], this.transform.position, Quaternion.identity) as GameObject;
objectkeeper.transform.parent = this.transform;
// Set the nextSpawn time to after SpawnDelay Duration
nextSpawn = Time.time + SpawnDelay;
}
void OnDrawGizmos(){
Gizmos.DrawWireSphere (this.transform.position, 0.5f);
}
}

Coroutine doesn't execute setActive(false)

I have an object in my game that is like a power object: when my player enters the power it should activate a panel that indicates that the power was grabbed, and past 3 seconds that panel should disappear. At the moment my panel appears when I hit the power, but it doesn't disappear. I am using a Coroutine like this:
using UnityEngine;
using System.Collections;
public class shrink : MonoBehaviour {
public float value = 0.1f; //1 by default in inspector
private bool colided = false;
private float speed;
Manager gameManager;
public GameObject panel;
// Update is called once per frame
void Start(){
speed = 3.4f;
gameManager = GameObject.Find ("GameController").GetComponent<Manager> ();
}
void OnTriggerEnter(Collider c)
{
if (c.gameObject.tag == "Player") {
colided = true;
gameManager.powerUp1 = true;
StartCoroutine(menuOp());
}
}
//This method is executed every frame
void Update(){
if (colided) {
Vector3 temp = transform.localScale;
//We change the values for this saved variable (not actual transform scale)
temp.x -= value * Time.time;
temp.y -= value * Time.time;
if (temp.x > 0) {
speed += 0.02f;
transform.Rotate (0f, 0f, Time.deltaTime * 90 * speed);
transform.localScale = temp;
} else {
Object.Destroy (this.gameObject);
}
}
}
IEnumerator menuOp(){
panel.SetActive (true);
yield return new WaitForSeconds (3f);
panel.SetActive (false);
}
}
Ps: what is inside the update is independent from what i need to do, so i think it doesn't interfer with my needs.

I think you might be destroying the GameObject before the WaitForSeconds(3f) has ended, which will prevent panel.SetActive(false) from executing.
In your Update-method's "else statement to if (temp.x > 0)" you're destroying the GameObject that tries to show/hide the panel.
If you absolutely need to Destroy this gameobject at that time you should break out your IEnumerator to another script and call it from this (shrink.cs) script.

Destroying the object before 3 seconds might be the issue. You can check by putting two logs:
1- After "Object.Destroy" line
2- After "WaitForSeconds"

maybe you should check if your gameobject(shrink's) is unactive or destroyed.
coroutine does not work with unactive gameobject.