Unity UGUI实现滑动翻页直接跳转页数

using unityengine;
using system.collections;
using unityengine.ui;
using system.collections.generic;
using unityengine.eventsystems;
using system;
 
public class pageview : monobehaviour, ibegindraghandler, ienddraghandler
{
 
 private scrollrect rect;      //滑动组件 
 private float targethorizontal = 0;    //滑动的起始坐标 
 private bool isdrag = false;     //是否拖拽结束 
 private list<float> poslist = new list<float>();   //求出每页的临界角，页索引从0开始 
 private int currentpageindex = -1;
 public action<int> onpagechanged;
 public recttransform content;
 private bool stopmove = true;
 public float smooting = 4;  //滑动速度 
 public float sensitivity = 0;
 private float starttime;
 
 private float startdraghorizontal;
 public transform togglelist;
 
 void start()
 {
  rect = transform.getcomponent<scrollrect>();
  var _rectwidth = getcomponent<recttransform>();
  var tempwidth = ((float)content.transform.childcount * _rectwidth.rect.width);
  content.sizedelta = new vector2(tempwidth, _rectwidth.rect.height);
  //未显示的长度
  float horizontallength = content.rect.width - _rectwidth.rect.width;
  for (int i = 0; i < rect.content.transform.childcount; i++)
  {
   poslist.add(_rectwidth.rect.width * i / horizontallength);
  }
 }
 
 void update()
 {
  if (!isdrag && !stopmove)
  {
   starttime += time.deltatime;
   float t = starttime * smooting;
   rect.horizontalnormalizedposition = mathf.lerp(rect.horizontalnormalizedposition, targethorizontal, t);
   if (t >= 1)
    stopmove = true;
  }
  //debug.log(rect.horizontalnormalizedposition);
 }
 
 public void pageto(int index)
 {
  if (index >= 0 && index < poslist.count)
  {
   rect.horizontalnormalizedposition = poslist[index];
   setpageindex(index);
   getindex(index);
  }
 }
 private void setpageindex(int index)
 {
  if (currentpageindex != index)
  {
   currentpageindex = index;
   if (onpagechanged != null)
    onpagechanged(index);
  }
 }
 
 public void onbegindrag(pointereventdata eventdata)
 {
  isdrag = true;
  //开始拖动
  startdraghorizontal = rect.horizontalnormalizedposition;
 }
 
 public void onenddrag(pointereventdata eventdata)
 {
  float posx = rect.horizontalnormalizedposition;
  posx += ((posx - startdraghorizontal) * sensitivity);
  posx = posx < 1 ? posx : 1;
  posx = posx > 0 ? posx : 0;
  int index = 0;
 
  float offset = mathf.abs(poslist[index] - posx);
  //debug.log("offset " + offset);
 
 
  for (int i = 1; i < poslist.count; i++)
  {
   float temp = mathf.abs(poslist[i] - posx);
   //debug.log("temp " + temp);
   //debug.log("i" + i);
   if (temp < offset)
   {
    index = i;
    offset = temp;
   }
   //debug.log("index " + index);
  }
  //debug.log(index);
  setpageindex(index);
  getindex(index);
  targethorizontal = poslist[index]; //设置当前坐标，更新函数进行插值 
  isdrag = false;
  starttime = 0;
  stopmove = false;
 
 }
 
 public void getindex(int index)
 {
  var toogle = togglelist.getchild(index).getcomponent<toggle>();
  toogle.ison = true;
 }
}

using unityengine;
using system.collections;
using unityengine.ui;
using system;
 
public class gamecontroller : monobehaviour {
 [serializefield]
 private text pagenumber;
 [serializefield]
 private inputfield inputfield;
 [serializefield]
 private pageview pageview;
 // use this for initialization
 void start () {
  pagenumber.text = string.format ("当前页码：0");
  pageview.onpagechanged = pagechanged;
 }
 
 void pagechanged (int index) {
  pagenumber.text = string.format ("当前页码：{0}" , index.tostring ());
 }
 
 public void onclick () {
  try {
   int idnex = int.parse (inputfield.text);
   pageview.pageto (idnex);
  } catch(exception ex) {
   debug.logwarning ("请输入数字"+ex.tostring()); 
  }
 }
 
 void destroy () {
  pageview.onpagechanged = null;
 }
}