【Unity】【Code】Unity+触摸屏 单点旋转，双点放大缩小

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class Touch : MonoBehaviour {

public Text txt;
public EventDispatcher evt;
float distance = 0;//触控缩放的距离
private float lastDist = 0;//用于计算触控缩放
private float curDist = 0;//用于计算触控缩放
int t;//判断缩放触控

private Vector3 pos1;

private Quaternion pos2;

private void Start()
{
pos1 = this.gameObject.transform.localScale;
pos2 = this.gameObject.transform.rotation;
}

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

//单点触摸， 水平上下旋转
if (1 == Input.touchCount)
{

var touch = Input.GetTouch(0);
ShowTxt("touch: " + touch.position);
if (touch.position.y > Screen.height * 0.25f &&
touch.position.y < Screen.height * 0.93f)
{
Vector2 deltaPos = touch.deltaPosition;
transform.Rotate(Vector3.down * deltaPos.x * 0.05f, Space.World);
transform.Rotate(Vector3.right * deltaPos.y * 0.05f, Space.World);
}

}

//两点以上触控，且触控点发生移动
if ((Input.touchCount > 1) && (Input.GetTouch(0).phase == TouchPhase.Moved
|| Input.GetTouch(1).phase == TouchPhase.Moved))
{
var touch1 = Input.GetTouch(0); //第一根手指
var touch2 = Input.GetTouch(1); //第二根手指
ShowTxt("touch1: " + touch1.position);
ShowTxt("touch2: " + touch2.position);
if (touch1.position.y > Screen.height * 0.25f &&
touch1.position.y < Screen.height * 0.93f &&
touch2.position.y > Screen.height * 0.25f &&
touch2.position.y < Screen.height * 0.93f)
{
curDist = Vector2.Distance(touch1.position, touch2.position);//两指间距
//当手指移动时，重置起始距离为当前距离
if (t == 0)
{
lastDist = curDist;
t = 1;
}
distance = curDist - lastDist;
if (this.gameObject.transform.localScale.x >= 1 &&
this.gameObject.transform.localScale.x <     this.gameObject.transform.localScale.x*20)
{
this.gameObject.transform.localScale += Vector3.one * distance * 0.05f * Time.deltaTime;
}
else
{
this.gameObject.transform.localScale = new Vector3(1, 1, 1);
}
}

lastDist = curDist;
}

//没有触控事件
if (Input.touchCount == 0)
t = 0;
}

private void ShowTxt(string info)
{
txt.text = info + "\r\n" + txt.text;
}
}