Player is only detected in trigger when moving

Questions & Answers
1

In my game I have a switch. The switch has a trigger on it to detect when the player is touching is so that he/she can flick it my pressing ‘E’.

The weird part is I can only trigger the switch when the player is moving, I am using addforce for movement.

Below is the code for my player and my switch. I have also attached my project folder so that if someone is willing to take the time and try it they can. The reproduction rate is 100% of the time for me.

Obviously this is not the intended result, the player should be able to activate the switch even if they are standing still.

PLAYERMOVEMENT.CS:

using UnityEngine;
using System.Collections;

public class PlayerMovement : MonoBehaviour {

	private Rigidbody2D R2Dplayer;
	private bool grounded = true;
	[SerializeField] private Animator anim;

	// Use this for initialization
	void Start () {
		R2Dplayer = GetComponent<Rigidbody2D>();
	}

	// Update is called once per frame
	void Update () {
		anim.SetFloat("speed", Mathf.Abs(R2Dplayer.velocity.x));
		if(Input.GetKeyDown(KeyCode.W) || Input.GetKeyDown(KeyCode.UpArrow) || Input.GetKeyDown(KeyCode.Space)) {
			if(grounded == true) {
				R2Dplayer.AddForce (new Vector2(0,7.5f), ForceMode2D.Impulse);
			}
		}
		if(Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.LeftArrow)) {
			R2Dplayer.AddForce (new Vector2(-0.2f,0), ForceMode2D.Impulse);
			if (R2Dplayer.transform.rotation == new Quaternion (0.0f, 0.0f, 0.0f, 1.0f)) {
				R2Dplayer.transform.Rotate (0, 180, 0);
			}
		}
		if(Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.DownArrow)) {

		}
		if(Input.GetKey(KeyCode.D) || Input.GetKey(KeyCode.RightArrow)) {
			R2Dplayer.AddForce (new Vector2(0.2f,0), ForceMode2D.Impulse);
			if (R2Dplayer.transform.rotation == new Quaternion (0.0f, -1.0f, 0.0f, 0.0f)) {
				R2Dplayer.transform.Rotate (0, 180, 0);
			}
		}
	}

	void OnTriggerEnter2D(Collider2D c) {
		if(c.tag == "JumpTrigger") {
			grounded = true;
		}
	}

	void OnTriggerExit2D(Collider2D c) {
		if(c.tag == "JumpTrigger") {
			grounded = false;
		}
	}
}

SWITCH.CS:

using UnityEngine;
using System.Collections;

public class Switch : MonoBehaviour {

	[SerializeField] public bool switchPressed = false;
	private SpriteRenderer sr;
	[SerializeField] private Sprite on, off;

	// Use this for initialization
	void Start () {
		sr = GetComponent<SpriteRenderer> ();
	}

	// Update is called once per frame
	void Update () {
	
	}

	void OnTriggerStay2D(Collider2D c) {
		if(c.tag == "Player") {
			if(Input.GetKeyDown(KeyCode.E)) {
				if(switchPressed == false) {
					sr.sprite = on;
					switchPressed = true;
				}
				else if(switchPressed == true) {
					sr.sprite = off;
					switchPressed = false;
				}

			}
		}
	}
}

ZIP of my project that can be downloaded from dropbox: Dropbox - Error - Simplify your life

2

Set the sleeping mode of your switch from “start awake” to “never sleep”

BUT! you should not do it like this.

you should consider a cleaner solution where you’ve one place where your input is handled.

e.g. sending a raycast when E is pressed.

3

i have downloaded your project & corrected somethings :

void Update () {
	if (Input.GetKeyDown (KeyCode.E) && switchPressed) {
		if (sr.sprite == off) {
			sr.sprite = on;
		} else {
			sr.sprite = off;
		}
	}
}
void OnTriggerEnter2D(Collider2D c) {
	if(c.tag == "Player") {
		switchPressed = true;
	}
}
void OnTriggerExit2D(Collider2D cc){
	if (cc.tag == "Player") {
		switchPressed = false;
	}
}