unity3d移动摄像机，支持PC、手机

using UnityEngine;
using System.Collections;

public class MoveCamera : MonoBehaviour {

// 记录手指触屏的位置
Vector2 m_screenpos = new Vector2();

// Use this for initialization
void Start () {

        // 允许多点触控
Input.multiTouchEnabled = true;
    }

// Update is called once per frame
void Update () {

#if !UNITY_EDITOR && ( UNITY_IOS || UNITY_ANDROID )

MobileInput();
#else
DesktopInput();
#endif

}

// 桌面系统鼠标操作
void DesktopInput()
{
// 记录鼠标左键的移动距离
float mx = Input.GetAxis("Mouse X");
float my = Input.GetAxis("Mouse Y");

if (  mx!= 0 || my !=0 )
{
//松开鼠标左键
if (Input.GetMouseButton(0))
{
Camera.main.transform.Translate(new Vector3(mx*Time.deltaTime, my * Time.deltaTime, 0));
}
}
}

// 移动平台触屏操作
void MobileInput()
{

if (Input.touchCount <= 0)
return;

// 1个手指触摸屏幕
if (Input.touchCount == 1)
{

if (Input.touches[0].phase == TouchPhase.Began)
{
// 记录手指触屏的位置
m_screenpos = Input.touches[0].position;

}
// 手指移动
else if (Input.touches[0].phase == TouchPhase.Moved)
{
// 移动摄像机
Camera.main.transform.Translate(new Vector3(Input.touches[0].deltaPosition.x * Time.deltaTime, Input.touches[0].deltaPosition.y * Time.deltaTime, 0));
}

// 手指离开屏幕 判断移动方向
if (Input.touches[0].phase == TouchPhase.Ended &&
Input.touches[0].phase != TouchPhase.Canceled)
{

Vector2 pos = Input.touches[0].position;

// 手指水平移动
if (Mathf.Abs(m_screenpos.x - pos.x) > Mathf.Abs(m_screenpos.y - pos.y))
{
if (m_screenpos.x > pos.x){
//手指向左划动
}
else{

//手指向右划动
}
}
else   // 手指垂直移动
{
if (m_screenpos.y > pos.y){
//手指向下划动
}
else{
//手指向上划动
}

}

}

}
else if ( Input.touchCount >1 )
{
// 记录两个手指的位置
Vector2 finger1 = new Vector2();
Vector2 finger2 = new Vector2();

// 记录两个手指的移动
Vector2 mov1 = new Vector2();
Vector2 mov2 = new Vector2();

for (int i=0; i<2; i++ )
{
Touch touch = Input.touches[i];

if (touch.phase == TouchPhase.Ended )
break;

if ( touch.phase == TouchPhase.Moved )
{

float mov = 0;
if (i == 0)
{
finger1 = touch.position;
mov1 = touch.deltaPosition;

}
else
{
finger2 = touch.position;
mov2 = touch.deltaPosition;

if (finger1.x > finger2.x)
{
mov = mov1.x;
}
else
{
mov = mov2.x;
}

if (finger1.y > finger2.y)
{
mov+= mov1.y;
}
else
{
mov+= mov2.y;
}

Camera.main.transform.Translate(0, 0, mov * Time.deltaTime);
}

}
}
}

}
}