Change background image on runtime - Unity 2D

Question

I need to change background image in unity 2D to a user-specified image while game is runing with C# script. The user will input the image file path.

Answer 1

solution:

1. add the following C# script to a game object
2. attach the InputField filePathInput and Image game object you wanna change backgroundImage to the script
3. create a button
4. attach the ChangeBackground function to the OnClick event of the button.

Here is the script. It uses an IEnumerator so that you can call the function from the main thread without freezing the game for a while.

using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
using System.Collections;

public class BackgroundChanger : MonoBehaviour
{
    public InputField filePathInput; // Input field for file path
    public Image backgroundImage; // Image component to change background

    public void ChangeBackground()
    {
        string filePath = filePathInput.text;
        if (string.IsNullOrEmpty(filePath))
        {
            print("File path is empty");
            return;
        }
        StartCoroutine(LoadImage(filePath));
    }

    private IEnumerator LoadImage(string filePath)
    {
        filePath = "file:///" + filePath;
        
        using (UnityWebRequest uwr = UnityWebRequestTexture.GetTexture(filePath))
        {
            yield return uwr.SendWebRequest();

            if (uwr.result != UnityWebRequest.Result.Success)
            {
                Debug.LogError("Error loading image: " + uwr.error);
            }
            else
            {
                Texture2D texture = DownloadHandlerTexture.GetContent(uwr);
                Sprite newSprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0.5f, 0.5f));
                backgroundImage.sprite = newSprite;
            }
        }
    }
}