How to move 2D Object within camera view boundary

Question

I have a scene that my camera doesn\'t follow my player. When player reaches the end of camera I want player to can\'t go further (out of camera view). How can I do this?

Answer 1

You need to limit your transform's position based on the edges of the camera. Here is an answer describing the different coordinate systems in unity

You're probably looking to do something like this:

float xMin = Camera.main.ViewportToWorldPoint(Vector3.zero).x;
float xMax = Camera.main.ViewportToWorldPoint(Vector3.one).x;

Vector3 currentPos = transform.position;
float dx = Input.GetAxis ("Horizontal") / 100 * speed;
Vector3 desiredPos = new Vector3(currentPos.x + dx, currentPos.y, currentPos.z);

Vector3 realPos = desiredPos;

if(desiredPos.x > xMax)
    realPos.x = xMax;
else if(desiredPos.x < xMin)
    realPos.x = xMin;

transform.position = realPos;

Read up here for more info on ViewportToWorldPoint(), it's extremely useful to become comfortable with the different coordinate spaces and how you can convert between them.