Unity3D realizes standby state picture loop fade in and out

using ;

public Image nobody_Img1;
public Image nobody_Img2;//Two pictures of fading in and outpublic float fadeTotalTime=5f;//Fail timepublic float imageStaticTime=3f;//Picture still timepublic float runningTime=10f;//Program run timepublic int StandbyTime=5;//No operation time/*
[HideInInspector]
public bool standby=false;
*/

private bool standby=false;//Whether it is in standby modeprivate float startTime=0;//Start standby timeprivate int imgIndex=2;//Picture index (picture name)private float remainder=0//Next standby start timeprivate bool hasStartNext=false;//Have the next standby picture loadedprivate bool canLoad=true;//Is the picture possible to loadprivate bool startCountTime=false;//Can you count the standby timeprivate int standbyTime=0;//Standby timeprivate int time=0;//Frame count, used to count standby timeprivate Vector3 prevMousePos=;//The position of the previous frame of the mouse is
/*Variable Description
 After judging that the screen has no operation (and the mouse position must not change), start counting the time when there is no operation (i.e. startCountTime=true, time++ (in the FixedUpdate function), standbyTime++), when standbyTime exceeds the specified time, standby=true; start the picture fading in and out
 */

/*
 When the program is just running, regardless of whether there is any operation or not, the startup time will start counting ten seconds.
 */
IEnumerator StartPrepareStandby()
{
 yield return new WaitForSeconds(runningTime);
 startCountTime=true;//Start counting the standby time}

/*
 After entering standby, two pictures are displayed and faded in and out in the loop after a period of time.
 */
IEnumerator StartFirstFade()
{
 //Two real pictures nobody_Img1.enabled=true;
 nobody_Img2.enabled=true;
 yield return new WaitForSeconds(imageStaticTime);
 //Reset time startTime=;//The start standby time is equal to the current time of the program remainder=startTime;//Record the time when fading starts //Start standby standby=true;
}

/*
 The fade cycle after the first fade is started
 */
IEnumerator StartNextFade()
{
 if(imgIndex>=4)//Judge whether the image index is out of bounds (the image index is also the image name)  imgIindex=0;
 // canLoad is used here to determine which image to load if(canLoad)
 {
  nobody_Img1.sprite=((),typeof(Sprite)) as Sprite;
 }
 else
 {
  nobody_Img2.sprite=((),typeof(Sprite)) as Sprite;
 }
 canLoad = !canLoad;//Inverse, used to distinguish the loading of pictures imgIndex++；//The image index is accumulated, and the next picture is loaded next time yield return new WaitForSeconds(imageStaticTime);
 //Reset the fade time startTime=;
 remainder=startTime;
 //The picture has been loaded, waiting for the next loading hasStartNext=false;
}

void Start()
{
 //Call the coroutine that starts counting the standby time StartCoroutine(StartPrepareStandby());
}

void FixedUpdate()
{
 if(startCountTime)
 {//Stat time without operation  if(==prevMousePos)
  {//Judge whether the mouse is still moving   time++;
  }
  else
  {//Reset standby time when the mouse is moved   standbyTime=0;
   time=0;
  }
 }
 if(time>=50)
 {
  time=0;
  standbyTime++;//Standby seconds }
 if(standbyTime>StandbyTime)
 {//The standby state is considered to be exceeded if the specified time is not operated.  standbyTime--;//The first time the image fade is executed only once  startCountTime=false;// Statistics of stop standby time  StartCoroutine(StartFirstFade());//First the first picture fades in and out }
}

void Update()
{
 if((0))
 {//Every time the mouse is pressed, it stops standby and related judgments  StopCoroutine(StartNextFade());//Stop fading  standby=false;//Exit standby state  //Retain the alpha value of the current image  if(canLoad)
  {//Judge which photo is fading based on the current canLoad   nobody_Img1.color=new Color(1,1,1,1);
   nobody_Img2.color=new Color(1,1,1,0);
  }
  else
  {
   nobody_Img1.color=new Color(1,1,1,0);
   nobody_Img2.color=new Color(1,1,1,1);
  }
  //Hide standby picture   nobody_Img1.enabled=false;
   nobody_Img2.enabled=false;
   //Reset the standby time   standbyTime=0;
   time=0;
 }
 else if((0))
 {//Every time the mouse is lifted, it is considered to be no operation  startCountTime=true;
  prevMousePos=;
 }
 if(standby)
 {
  if(<startTime+fadeTotalTime)
  {
   float alphaValue=(-remainder)/fadeTotalTime;
   if(canLoad)
   {
    nobody_Img1.color=new Color(1,1,1,1-alphaValue);
    nobody_Img2.color=new Color(1,1,1,alphaValue);
   }
   else
   {
    nobody_Img1.color=new Color(1,1,1,alphaValue);
    nobody_Img2.color=new Color(1,1,1,1-alphaValue);
   }
  }
  else
  {
   if(!hasStartNext)
   {
    hasStartNext=true;//The next photo has started loading    StartCoroutine(StartNextFade());//Start the next fade coroutine   }
  }
 }
 prevMousePos=;//Record the mouse position of each frame}