Drag An Object in iOS

I am trying to drag an object with iOS touch. It seems to be almost working, but it does not hold onto the object when I begin to drag my finger across the screen.

if(Input.touchCount>0 && Input.GetTouch(0).phase==TouchPhase.Moved){
			Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
			if (Physics.Raycast(ray)){
				touch=ray.origin;
				enemy.position=touch;
			}
		}

In other words you should drag it until you separate it if you become effective once

if(Input.touchCount>0 && Input.GetTouch(0).phase==TouchPhase.Moved){
	ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
	if (Physics.Raycast(ray)){
		dragEnable = true;
	}
	if( dragEnable ){
		this.gameObject.transform.position=Input.GetTouch(0).position;
	}
} else {
	dragEnable = false;
}

Use the hitInfo from the Raycast instead of Ray.origin as the world position of the object.

Could you elaborate further on this? This is what I have currently:

if(Input.touchCount>0 && Input.GetTouch(0).phase==TouchPhase.Moved){
				ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
				if(Input.GetTouch(0).phase==TouchPhase.Moved){
					if (Physics.Raycast(ray)){
						this.gameObject.transform.position=ray.GetPoint(100);
					}
				}
			}

This does grab the object, but it seems to fall out of range when moving my finger around