Help with y-position

Unity Engine
1

I’m a newbie here, but this is my code to switch gravity at certain y positions to make a sprite bob up and down, only problem is that the gravity keeps changing all the time, not only when it reaches the thresholds.

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

public class SetGravity : MonoBehaviour {

private Rigidbody2D rb2d;
private RectTransform rect;

private void Start()
{
rb2d = GetComponent ();
rect = GetComponent ();
}

void FixedUpdate()
{
float y = rect.position.y;

if (y >= 105 || y <= 75)
{
rb2d.gravityScale = -rb2d.gravityScale;
}

}
}

Any help would be appreciated.

2

Is the sprite a gui item? Just wondering why you are using recttransform and not just a transform.

3

y = 75.5 (-g => move -1)
y = 74.5 (+g => move +1)
y = 75.5 (-g => move -1)
y = 74.5 (+g => move +1)
y = 75.5 (-g => move -1)
y = 74.5 (+g => move +1)
y = 75.5 (-g => move -1)
y = 74.5 (+g => move +1)
y = 75.5 (-g => move -1)
y = 74.5 (+g => move +1)
…

I think you’re looking for “if > value and I’m falling up, or < value and I’m falling down” to keep things “in the middle”?

4

the sprite is an image created in the UI as an image on the canvas and yes, I’m trying to make it where when the Rect Transform Pos Y = 75, move up, When it reaches 105, move down. I thought it would be an easy way to bob my logo up and down on my startup scene.