ios - When making an if statement can I make it so a void that is already running be overwritten? -

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i have bug game red circle, blue circle, , yellow circle. can touch red circle. have random button selector called buttonchanger. whenever method run selects random button , after amount of time button disappears , method runs again. wondering if made statement 

if bluecircle.hidden = yes, redcircle.hidden = yes, yellowcircle.hidden = yes{ [self buttonchanger]; }

this stuck. if run if statement buttons keep changing , continue overlap void until crashes. wondering if inside if statement can make if statement overrides previous 1 fine , running , void not overlap. so:

    if bluecircle.hidden = yes, redcircle.hidden = yes, yellowcircle.hidden = yes{   if buttonchanger running{     }     else{         [self buttonchanger];     }         }

if wish see code here is:

#import "viewcontroller.h" #import "viewcontroller.m"   @interface viewcontroller ()  @end  int randomnumber; double buttontime; int randomnumberbutton; int score; int highscoreint;  @implementation viewcontroller  - (void)viewdidload {     [super viewdidload];     // additional setup after loading view, typically nib.     if ([[uiscreen mainscreen] respondstoselector:@selector(scale)]) {         if ([[uiscreen mainscreen] scale] == 2.0) {              if([uiscreen mainscreen].bounds.size.height == 667){                 // iphone retina-4.7 inch(iphone 6)             }             else if([uiscreen mainscreen].bounds.size.height == 568){                 // iphone retina-4 inch(iphone 5 or 5s)             }             else{                 // iphone retina-3.5 inch(iphone 4s)             }         }         else if ([[uiscreen mainscreen] scale] == 3.0)         {             //if want detect iphone 6+             if([uiscreen mainscreen].bounds.size.height == 736.0){                 //iphone retina-5.5 inch screen(iphone 6 plus)             }             //iphone retina-5.5 inch screen(iphone 6 plus)         }       } }         - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  @end @implementation game{   }   -(void)viewdidappear:(bool)animated{      play.hidden = no;   } - (void)viewdidload {      [super viewdidload];     scorelabeldisplay.hidden = yes;     // additional setup after loading view, typically nib.     gameover.hidden = yes;     menu.hidden = yes;     redcircle2.hidden = yes;     yellowcircle.hidden = yes;     bluecircle.hidden = yes;     score = 0;     scorelabel.font = [uifont systemfontofsize:25];     scorestring = [nsstring stringwithformat:@"score:%i", score];     scorelabel.text = scorestring;     gameover.font = [uifont systemfontofsize:50];     scorelabeldisplay.font = [uifont systemfontofsize:25];     highscore.hidden = yes;     highscore.font = [uifont systemfontofsize:25];     nsurl *soundurl = [nsurl fileurlwithpath:[nsstring stringwithformat:@"%@/ding.wav", [[nsbundle mainbundle] resourcepath]]];      audioservicescreatesystemsoundid((__bridge cfurlref)soundurl, &playsoundid);   }    - (void)didreceivememorywarning {      [super didreceivememorywarning];      // dispose of resources can recreated.  }  #pragma mark iad delegate methods -(void)bannerviewdidloadad:(adbannerview *)banner{      [uiview beginanimations:nil context:nil];     [uiview setanimationduration:1];     [banner setalpha:2];     [uiview commitanimations];  } -(void)bannerview:(adbannerview *)banner didfailtoreceiveadwitherror:(nserror *)error{       [uiview beginanimations:nil context:nil];     [uiview setanimationduration:1];     [banner setalpha:0];     [uiview commitanimations];  }   -(double)generatebuttontime {     nsinteger randomnumber = arc4random_uniform(100);     double buttomtime = 0;     if (randomnumber>50) {         if (randomnumber<75) {           buttomtime = 0.5;         }}     if (randomnumber>75){            buttomtime = 1.0;         }     if (randomnumber<50) {         buttomtime = 0.4 ;     }      if (randomnumber>10){         if (randomnumber<50) {           buttomtime = 0.2 ;         }}     return buttomtime; }   -(void)enablebluecircle:(nstimer*)timer {     bluecircle.hidden = yes;     [self buttonchanger];   }  -(void)enableyellowcircle:(nstimer*)timer {     yellowcircle.hidden = yes;     [self buttonchanger];   }   -(void)fixbug{     if (redcircle2.hidden = yes, bluecircle.hidden = yes, yellowcircle.hidden = yes) {          [self buttonchanger];     } } -(void)setredcircle:(nstimer*)timer {     redcircle2.hidden = yes;     [self buttonchanger];  } -(void)buttonchanger{     buttontime = 0;      randomnumberbutton = arc4random_uniform(100);      if (randomnumberbutton>75) {         redcircle2.hidden = yes;         yellowcircle.hidden = yes;         bluecircle.hidden = no;         [nstimer scheduledtimerwithtimeinterval:[self generatebuttontime] target:self selector:@selector(enablebluecircle:) userinfo:nil repeats:no];        }     if (randomnumberbutton<30){           redcircle2.hidden = yes;         bluecircle.hidden = yes;          yellowcircle.hidden = no;          [nstimer scheduledtimerwithtimeinterval:[self generatebuttontime] target:self selector:@selector(enableyellowcircle:) userinfo:nil repeats:no];          }      if (randomnumberbutton>30) {         if (randomnumberbutton<75) {          redcircle2.hidden = no;         bluecircle.hidden = yes;         yellowcircle.hidden = yes;         [nstimer scheduledtimerwithtimeinterval:[self generatebuttontime] target:self selector:@selector(setredcircle:) userinfo:nil repeats:no];         }     }      } - (ibaction)redcirclebutton:(id)sender {     randomnumber = 0;     score = score + 1;     scorestring = [nsstring stringwithformat:@"score:%i", score];     scorelabel.text = scorestring;     audioservicesplaysystemsound(playsoundid);   }    - (ibaction)bluecirclebutton:(id)sender {     [self gameover]; } -(void)gameover{     gameover.hidden = no;     bluecircle.enabled = no;     bluecircle.hidden = yes;     yellowcircle.enabled = no;     yellowcircle.hidden = yes;     redcircle2.hidden = yes;     redcircle2.enabled = no;     menu.hidden = no;     scorelabeldisplay.hidden = no;     scorelabeldisplay.text = scorestring;     if (score > highscoreint) {         highscoreint = score;     }     highscore.hidden = no;     highscorestring = [nsstring stringwithformat:@"highscore:%i", highscoreint];      highscore.text = highscorestring;     scorelabel.hidden = yes;  }   - (ibaction)yellowcirclebutton:(id)sender {     [self gameover]; }  - (ibaction)playaction:(id)sender {     [self buttonchanger];     play.hidden = yes;  }    @end

this line sounds strange:

if (redcircle2.hidden = yes, bluecircle.hidden = yes, yellowcircle.hidden = yes)

you assigning yes hidden property of redcircle2, bluecircle , yellowcircle , true boolean expression....

you wants this:

if (redcircle2.hidden && bluecircle.hidden && yellowcircle.hidden)

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