Check if 2 UI Elements are overlapping (using Rect.Overlaps())

UIOverlap.cs

Vector3[] corners = new Vector3[4];
rectTransform1.GetWorldCorners(corners);
Rect rec = new Rect(corners[0].x,corners[0].y,corners[2].x-corners[0].x,corners[2].y-corners[0].y);

rectTransform2.GetWorldCorners(corners);
Rect rec2 = new Rect(corners[0].x, corners[0].y,corners[2].x-corners[0].x,corners[2].y-corners[0].y);

if (rectTransform1.Overlaps(rectTransform2))
{
    Debug.Log("rectTransform1 is Overlapping rectTransform2!");
}