Intro to Unity

ClipToCameraBounds.cs

using UnityEngine;
using System.Collections;

public class ClipToCameraBounds : MonoBehaviour {

	private float minPos;
	private float maxPos;

	private SpriteRenderer renderer;

	// Use this for initialization
	void Start () {

		renderer = this.gameObject.GetComponent<SpriteRenderer>();

		float halfSize = renderer.bounds.size.x/2;

		minPos = Camera.main.ScreenToWorldPoint(Vector3.zero).x + halfSize;
		maxPos = Camera.main.ScreenToWorldPoint(new Vector3(Camera.main.pixelWidth,0)).x - halfSize;
		Debug.Log(minPos);
		Debug.Log(maxPos);
	}
	
	// Update is called once per frame
	void Update () {
		//this.transform.position = new Vector2(Mathf.Clamp(this.transform.position.x,minPos,maxPos), this.transform.position.y);
	}

	void LateUpdate(){
		this.transform.position = new Vector2(Mathf.Clamp(this.transform.position.x,minPos,maxPos), this.transform.position.y);
	}
}

MoveLeftAndRight.cs

using UnityEngine;
using System.Collections;

public class MoveLeftAndRight : MonoBehaviour {

	public float speed;

	//Rigidbody2D body;

	// Use this for initialization
	void Start () {
		//body = this.gameObject.GetComponent<Rigidbody2D>();
	}
	
	// Update is called once per frame
	void Update () {
		if(Input.GetKey(KeyCode.LeftArrow) || Input.GetKey(KeyCode.RightArrow)){
			float magnitude = speed * Time.deltaTime;
			if(Input.GetKey(KeyCode.LeftArrow)){
				magnitude *= -1;
			}
			//body.velocity = new Vector2(magnitude,0);
			this.transform.position = new Vector2(this.transform.position.x+magnitude, this.transform.position.y);
		}
	}
}