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OnTriggerEnter2D doesn't work after switching scenes

I have a game that is similar to "Flappy Bird" and I have main menu where I can start game and change skin of a pigeon. My skin collection is implemented with scroll rect and in the center there is a trigger which starts an animation of scaling a pigeon, it works fine until I click "start" and the scene changes to game and when I return to my main menu and click "skins" this trigger doesn't work anymore.
Script what is attached to all scroll rect elements to detect collisions with trigger:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ResizeFieldScript : MonoBehaviour
{
private Animator _anim;
private void Start()
{
_anim = GetComponent<Animator>();
}
public void OnTriggerEnter2D(Collider2D collider)
{
Debug.Log("Trigger is working");
if(collider.tag == "ResizeField")
{
Debug.Log("Condition is working");
_anim.SetBool("isInTrigger", true);
}
}
public void OnTriggerExit2D(Collider2D collider)
{
_anim.SetBool("isInTrigger", false);
}
}
Script what is attached to an empty object to change scenes:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.SceneManagement;
public class UIController : MonoBehaviour
{
[SerializeField] private List<string> sceneNameList;
private string sceneToFind;
private int index = 0;
public void SceneChanger()
{
sceneToFind = EventSystem.current.currentSelectedGameObject.name;
foreach(string str in sceneNameList)
{
if(str == sceneToFind)
{
SceneManager.LoadScene(index);
index = 0;
break;
}
index++;
}
}
public void Exit()
{
Application.Quit();
}
public void BackMenu()
{
SceneManager.LoadScene(4);
}
}

OnTriggerEnter2D doesn't work after switching scenes. We could use OnTriggerEnter2D to jump scenes.
code show as below:
private void Update() {
// If E is pressed
if (Input. GetKeyDown(KeyCode. E)) {
// scene switching
SceneManager.LoadScene(4);
}
}
private void OnTriggerEnter2D(Collider collision) {
if (collision. tag == "ResizeField") {
// The UI prompts the user to press E to jump
EnterDialog.SetActive(true);
Debug.Log("Condition is working");
// _anim.SetBool("isInTrigger", true);
}
}
Hope it helps you.

Executing a Function Between Script Files

Tell me please. I have 2 scripts that hang on different Unity objects. The first script is for clicking a button. The second one is for executing the function.
How can I execute the AddItem function if the button is pressed?
Script 1 (button click):
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
public class UseButton : MonoBehaviour, IPointerUpHandler, IPointerDownHandler
{
public bool isClick = false;
public void OnPointerDown(PointerEventData ped)
{
isClick = true;
}
public void OnPointerUp(PointerEventData ped)
{
isClick = false;
}
}
Script 2 (Adding Items):
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
public class InventoryManager : MonoBehaviour
{
public void AddItem(ItemScriptableObject _item, int _amount)
{
foreach(InventorySlot slot in slots)
{
if (slot.item == _item)
{
slot.amount += _amount;
return;
}
}
foreach(InventorySlot slot in slots)
{
//print(_item+" "+_amount);
if (slot.isEmpty == true)
{
slot.item = _item;
slot.amount = _amount;
slot.isEmpty = false;
slot.SetIcon(_item.icon);
return;
}
}
}

If you dont have a variable on the second script, of the first script, you should do that by using:
GameObject go;
go.GetComponent<InventoryManager>();
try changing the first script to something like:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
public class UseButton : MonoBehaviour, IPointerUpHandler, IPointerDownHandler
{
public bool isClick = false;
void Update()
{
if (isClick)
{
Debug.Log("do something")
}
}
public void OnPointerDown(PointerEventData ped)
{
isClick = true;
}
public void OnPointerUp(PointerEventData ped)
{
isClick = false;
}
}
This way you can modify the variable: is Click easily.

How to select and deselect in a crossword game

So, im doing a crossword game in Unity Engine, and when i select (with my left click button) a word, the white tiles should turn green (which occurs), but when i stop holding my left mouse click button, it does not turns white again as you can see on the print
And the code is here:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using System;
public class Selecionar : MonoBehaviour, ISelectHandler, IPointerClickHandler, IDeselectHandler {
private int acertos;
public static HashSet<Selecionar> todosMeusSelecionaveis = new HashSet<Selecionar>();
public static HashSet<Selecionar> selecionado = new HashSet<Selecionar>();
Renderer myRenderer;
[SerializeField]
Material materialNaoSelecionado;
[SerializeField]
Material materialSelecionado;
void Awake()
{
todosMeusSelecionaveis.Add(this);
myRenderer = GetComponent<Renderer>();
}
public void OnDeselect(BaseEventData eventData)
{
myRenderer.material = materialNaoSelecionado;
}
public void OnPointerClick(PointerEventData eventData)
{
if(Input.GetKeyDown(KeyCode.Mouse0)){
DeselectAll(eventData);
}
OnSelect(eventData);
}
public void OnSelect(BaseEventData eventData)
{
selecionado.Add(this);
myRenderer.material = materialSelecionado;
}
public static void DeselectAll (BaseEventData eventData){
foreach (Selecionar selecionavel in selecionado)
{
selecionavel.OnDeselect(eventData);
}
selecionado.Clear();
}
}

I think you should return inside the if statement on OnPointerClick. When it enters, it executes DeselectAll followed by OnSelect.
Either do:
public void OnPointerClick(PointerEventData eventData)
{
if(Input.GetKeyDown(KeyCode.Mouse0)){
DeselectAll(eventData);
return; // <----
}
OnSelect(eventData);
}
or:
public void OnPointerClick(PointerEventData eventData)
{
if(Input.GetKeyDown(KeyCode.Mouse0)){
DeselectAll(eventData);
} else {
OnSelect(eventData);
}
}

I want to move 2d object only horizontally by touch in Unity

I implemented a touch drag.
But I can not move only horizontally.
I would expect to limit it to if, but I do not know what to do after that.
Here is my code.
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.EventSystems;
public class Draggable : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
public void OnBeginDrag (PointerEventData eventData)
{
Debug.Log ("OnBeginDrag");
}
public void OnDrag (PointerEventData eventData)
{
Debug.Log ("OnBeginDrag");
//this.transform.position = eventData.position;
GetComponent<Transform> ().position = eventData.position;
}
public void OnEndDrag (PointerEventData evnetData)
{
Debug.Log ("OnEndDrag");
}
}

You don't need to call GetComponent for transform.
If the code you were using works and you just want horizontal drag, something like this should work.
var currentPos = transform.position;
transform.position = new Vector3(eventData.position.x, currentPos.y, currentPos.z);

Buttons in Unity, without using UI?

Is there a way in Unity to create a simple 2D button without using the UI layer. I have a game with a lot of buttons and I don't want to make the whole app in the UI. Some more controls are welcome too: switches, sliders etc.
PS. I saw NGUI and I don't like it so far. Anything else?

Is there a way in Unity to create a simple 2D button without using the
UI layer
You can use Sprite/Sprite Render as a Button.First Create a GameObject and attach EventSystem and StandaloneInputModule to it. Attach Physics2DRaycaster to the Camera, implement IPointerClickHandler and override OnPointerClick function. Create a 2D Sprite by going to GameObject->2D Object->Sprite then attach your script to the Sprite. Here is a complete code to do that:
using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections;
public class SPRITEBUTTON: MonoBehaviour, IPointerClickHandler,
IPointerDownHandler, IPointerEnterHandler,
IPointerUpHandler, IPointerExitHandler
{
void Start()
{
//Attach Physics2DRaycaster to the Camera
Camera.main.gameObject.AddComponent<Physics2DRaycaster>();
addEventSystem();
}
public void OnPointerClick(PointerEventData eventData)
{
Debug.Log("Mouse Clicked!");
}
public void OnPointerDown(PointerEventData eventData)
{
Debug.Log("Mouse Down!");
}
public void OnPointerEnter(PointerEventData eventData)
{
Debug.Log("Mouse Enter!");
}
public void OnPointerUp(PointerEventData eventData)
{
Debug.Log("Mouse Up!");
}
public void OnPointerExit(PointerEventData eventData)
{
Debug.Log("Mouse Exit!");
}
//Add Event System to the Camera
void addEventSystem()
{
GameObject eventSystem = null;
GameObject tempObj = GameObject.Find("EventSystem");
if (tempObj == null)
{
eventSystem = new GameObject("EventSystem");
eventSystem.AddComponent<EventSystem>();
eventSystem.AddComponent<StandaloneInputModule>();
}
else
{
if ((tempObj.GetComponent<EventSystem>()) == null)
{
tempObj.AddComponent<EventSystem>();
}
if ((tempObj.GetComponent<StandaloneInputModule>()) == null)
{
tempObj.AddComponent<StandaloneInputModule>();
}
}
}
}
EDIT:
If this is a 3D GameObject/Mesh, then you need to add a simple collider to it. If it is just Sprite then you must add a 2D collider to the sprite.

Another approach that is even simpler, is to just add a BoxCollider2D component, then add the following methods to the a new componenent, say UIButton, where you will to perform the button actions :
void OnMouseOver()
void OnMouseDown()
void OnMouseUp()
This avoids the use of an EventSystem, StandaloneInputModule and Physics2DRaycaster.
Example :
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;
public class UIButton : MonoBehaviour {
public Sprite regular;
public Sprite mouseOver;
public Sprite mouseClicked;
public TextMeshPro buttonText;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
}
private void OnMouseDown()
{
}
private void OnMouseEnter()
{
}
private void OnMouseExit()
{
}
private void OnMouseUpAsButton()
{
}
}
Tested in unity 2018.1. One difference I initially noticed to this and the above approach is that the right mouse button click is not detected in this model, but is detected in the EventSystemModel.