Unity2D模拟控制位移

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

    public float speed = 10f;
    public Vector2 playerSize;


    void Update () {
        float v = Input.GetAxis("Vertical");
        float h = Input.GetAxis("Horizontal");

        transform.Translate(new Vector3(h * Time.deltaTime * speed, v * Time.deltaTime * speed, 0f));

        //检查坐标是否离开屏幕
        transform.position = transform.position.x < 0 + playerSize.x / 2 ? new Vector3(0 + playerSize.x / 2, transform.position.y, transform.position.z) : transform.position;
        transform.position = transform.position.x > Screen.width - playerSize.x / 2 ? new Vector3(Screen.width - playerSize.x / 2, transform.position.y, transform.position.z) : transform.position;
        transform.position = transform.position.y < 0 + playerSize.y / 2 ? new Vector3(transform.position.x, 0 + playerSize.y / 2, transform.position.z) : transform.position;
        transform.position = transform.position.y > Screen.height - playerSize.y / 2 ? new Vector3(transform.position.x, Screen.height - playerSize.y / 2, transform.position.z) : transform.position;

    }

    void OnGUI()
    {
        GUI.Label(new Rect(10f, 10f,200f, 100f), transform.position.ToString());
    }
}

控制UI的移动，可以使用在2D类移动上