objective c - Xcode Help using if statement to hide buttons -

i've got 3 buttons - when button 1 'grassleft' pressed want hide it/make fade out (and push next segue), after buttons 2 , 3 have been pressed , have disappeared first. don't want grassleft method push segue until grassmiddle , grassright have disappeared. don't think i'm using if statement properly. code:

- (ibaction)grassleft:(id)sender {    if ((grassrightbutton.hidden == yes)) {      grassleftbutton.alpha = 0;  } if ((grassmiddlebutton.hidden == yes)) {      grassleftbutton.alpha = 0;  }  else {      [uiview animatewithduration:0.3                           delay:0.0                         options:uiviewanimationoptioncurveeaseinout                      animations:^{                           self.grassleftbutton.alpha = 0;                         } completion:^(bool finished) {                           self.grassleftbutton.alpha = 0.0;                          [grassleftshakes invalidate];                       }];  }       double delayinseconds = 1;     dispatch_time_t poptime = dispatch_time(dispatch_time_now, (int64_t)(delayinseconds * nsec_per_sec));     dispatch_after(poptime, dispatch_get_main_queue(), ^(void){         [self performseguewithidentifier:@"gotoyakenclosure" sender:self];     });   }      - (ibaction)grassmiddle:(id)sender {    [uiview animatewithduration:0.3                       delay:0.0                     options:uiviewanimationoptioncurveeaseinout                  animations:^{                       self.grassmiddlebutton.alpha = 0;                     } completion:^(bool finished) {                       self.grassmiddlebutton.alpha = 0.0;                      [grassmiddleshakes invalidate];                      grassmiddlebutton.hidden = yes;                    }];   }    - (ibaction)grassright:(id)sender {  [uiview animatewithduration:0.3                       delay:0.0                     options:uiviewanimationoptioncurveeaseinout                  animations:^{                       self.grassrightbutton.alpha = 0;     } completion:^(bool finished) {       self.grassrightbutton.alpha = 0.0;          [grassrightshakes invalidate];      grassrightbutton.hidden = yes;    }];   } 

take 2 int variable middleflag , rightflag

now in grassrightbutton's action method assign rightflag = 1 , hide grassrightbutton

and in grassmiddlebutton's action method assign middleflag = 1 , hide grassmiddlebutton

now, in grassleft method

- (ibaction)grassleft:(id)sender {      if (rightflag == 1 && middleflag == 1 ) {          grassleftbutton.alpha = 0;          // if want segue performed if 2 , 3 button pressed put code here perform segue.      }     else {          [uiview animatewithduration:0.3                           delay:0.0                         options:uiviewanimationoptioncurveeaseinout                      animations:^{                          self.grassleftbutton.alpha = 0;                      } completion:^(bool finished) {                          button.alpha = 0.0;                          [grassleftshakes invalidate];                          double delayinseconds = 1;                          dispatch_time_t poptime = dispatch_time(dispatch_time_now, (int64_t)(delayinseconds * nsec_per_sec));                          dispatch_after(poptime, dispatch_get_main_queue(), ^(void){                              [self performseguewithidentifier:@"gotoyakenclosure" sender:self];                          });                      }];      } }