Change the UI image using script in unity c#

Question

I want to change the UI image in random order. I have a gameobject in UI(canvas) containing Image component and it has nul

Answer 1

To change the Image from a Button, don't use GetComponent () as you can potentially get another Image component that does not belong to the button. It can also return null if the object is disabled.

Use the Button.image.sprite or Button.image.overrideSprite variable instead.

public Button pb;
public Sprite newSprite;

void Start()
{
    pb.image.sprite = newSprite; 
}

Or

pb.image.overrideSprite = newSprite; 

It really doesn't matter which one is used. Any of these two should work.