select - iOS: change background color using multiple buttons -

i trying change background color randomly effect overtime of buttons on screen tapped. control effect on/off uibutton. tapping changecolorbutton logs “off” never “on”. not sure do? everyone!!

edited code far!! in .h

@property(nonatomic,readwrite) bool shouldchangecolor;  in .m - (ibaction)changecolorbutton:(uibutton*)sender {     // self.shouldchangecolor = !sender.selected;    sender.selected = !sender.selected;     if(sender.selected)     {         nslog(@"switch on");         //make off       //  sender.selected=no;    //    self.shouldchangecolor=true;        }     else          nslog(@"switch off");     //make on    // sender.selected=yes;     self.shouldchangecolor=true;          }  - (void)randomcolor{     int r = arc4random() % 255;     int g = arc4random() % 255;     int b = arc4random() % 255;      uicolor *color = [uicolor colorwithred:(r/255.0) green:(g/255.0) blue:(b/255.0) alpha:1.0];      [self.view setbackgroundcolor:color];  } 

because not changing selection of button

- (ibaction)changecolorbutton:(uibutton*)sender {     //self.shouldchangecolor = sender.selected;     sender.selected = !sender.selected; //if     if(sender.selected)    {       self.shouldchangecolor=yes;       nslog(@"switch on");       //make off       //sender.selected=no; don't have       [self randomcolor];//if want change color when switch on     }     else{       self.shouldchangecolor=no;       nslog(@"switch off");       //make on       //sender.selected=yes; don't have       [self.view setbackgroundcolor:[uicolor blackcolor]];//check syntax     } } 

now anywhere call function change color [self randomcolor];

- (void)randomcolor{ if(self.shouldchangecolor){   int r = arc4random() % 255; int g = arc4random() % 255; int b = arc4random() % 255;  uicolor *color = [uicolor colorwithred:(r/255.0) green:(g/255.0) blue:(b/255.0) alpha:1.0];  [self.view setbackgroundcolor:color]; } }