Drag GameObject with finger touch in SmartPhone

Questions & Answers
1

I have maybe a dumb question, but how do I drag a GameObject when I touch the screen? i’m new in Unity and i need to drag an object and make collide against other object.

2

You need to check for touches, get the touch and update the transform of whatever object you’re touching(hopefully).

Documentation of concern:

Touch

Touch.phase

Transform

Camera.ScreenToWorldPoint

if (Input.touchCount > 0) 
{
	Touch touch = Input.GetTouch(0); // get first touch since touch count is greater than zero
	
	if (touch.phase == TouchPhase.Stationary || touch.phase == TouchPhase.Moved) 
	{
		// get the touch position from the screen touch to world point
		Vector3 touchedPos = Camera.main.ScreenToWorldPoint(new Vector3(touch.position.x, touch.position.y, 10));
		// lerp and set the position of the current object to that of the touch, but smoothly over time.
		transform.position = Vector3.Lerp(transform.position, touchedPos, Time.deltaTime);
	}
}
3

Hey! Late to the party here but OnMouseDrag() totally works on mobile. Here is what worked for me:

void OnMouseDrag()
    {
        Vector3 mousePosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, distance);
        Vector3 objPosition = Camera.main.ScreenToWorldPoint(mousePosition);

        transform.position = objPosition;
    }