Can't drag HealthBar canvas object into GameObject HealthBar reference

Questions & Answers
1

I created in object Health Bar into my canvas and attached my HealthBar script to it:

200586-healthbar-scene.png
200586-healthbar-scene.png651×850 75.8 KB

Now I want to reference this Health Bar into my Monster that i’m spawning but it doesnt let me insert it into the public reference:

200587-monsterinput.png

Here is the code of my HealthBar script :

public class HealthBar : MonoBehaviour
{

public Slider slider;
public void SetMaxHealth(int health)
{
    slider.maxValue = health;
    slider.value = health;
}
public void SetHealth(int health)
{
    slider.value = health;
}

}

and here is the code of my MonsterManager:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MonsterManager : MonoBehaviour
{

public int maxHealth = 100;
public int currentHealth;
public HealthBar healthBar;

// Start is called before the first frame update
void Start()
{
    currentHealth = maxHealth;
    healthBar.SetMaxHealth(maxHealth);
    healthBar = GameObject.FindObjectOfType<HealthBar>();
}

// Update is called once per frame
void Update()
{
    if (Input.GetKeyDown(KeyCode.Space))
    {
        TakeDamage(20);
    }
    
}

void TakeDamage(int damage)
{
    currentHealth -= damage;
    healthBar.SetHealth(currentHealth);
}

}

It does find the HealthBar object as I can call it’s fuctions. I also tried many things like GetObect witht he name…

Any help?

2

The anwser to my problem the lack of some knowledge.

Indeed, it’s not allowed to drag UI component into Prefabs instances. The way to do around that is to create a new canvas with the image you want to add to your scene, make that canvas a World Object and then you can actually drag it.