这里给主相机绑定一个脚本。

脚本写为：

using UnityEngine;using System.Collections;public class camerafollow : MonoBehaviour {    //主摄像机跟随主角一起移动    public float xMargin = 1f;    public float yMargin = 1f;    public float xSmooth = 8f;    public float ySmooth = 8f;    public Vector2 maxXandY;    public Vector2 minXandY;	// Use this for initialization    private Transform player;	void Start () {
    //这里获得是绑定的主角，需要一起跟随移动，就要获得主角的属性        player = GameObject.FindGameObjectWithTag("pk_0").transform;        maxXandY.x = 10; maxXandY.y = 10;	}    bool checkxmargin() {        return Mathf.Abs(transform.position.x - player.position.x) > xMargin;    }    bool checkymargin() {        return Mathf.Abs(transform.position.y - player.position.y) > yMargin;    }	// Update is called once per frame	void Update () {        Trackplayer();	}    //跟踪主角    void Trackplayer() {        float targetx = transform.position.x;        float targety = transform.position.y;        if (checkxmargin())        {            targetx = Mathf.Lerp(transform.position.x, player.position.x, xSmooth * Time.deltaTime);        }        if (checkymargin())        {            targety = Mathf.Lerp(transform.position.y, player.position.y, xSmooth * Time.deltaTime);        }        targetx = Mathf.Clamp(targetx, minXandY.x, maxXandY.y);        targety = Mathf.Clamp(targety, minXandY.y, maxXandY.y);        transform.position = new Vector3(targetx, targety,transform.position.z);    }}

　　效果图：