ios - Shake gesture and prepare for seuge - Unbalanced calls to begin/end appearance transitions -

i have uitabelviewcontroller (mainviewctrl), if user select cell, new uiviewcontroller (detailviewctrl) been pushed "scene", detail data regarding selected cell. - pretty simple stuff.

if user shakes phone, (detailviewctrl) been showed random detail data.

here prepareforseque code:

- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {      if ([segue.identifier isequaltostring:@"detailviewseque"])     {         int i;          if ([sender iskindofclass:[uitableviewcell class]]){             uitableviewcell *cell = (uitableviewcell*)sender;             nsindexpath *indexpath = [self.minifigstableview indexpathforcell:cell];             = indexpath.row;         }else{             = arc4random() % [self.collectionofdata count];         }              deatilviewcontroller *dest = [segue destinationviewcontroller];             dest.data = [self.collectionofdata objectatindex:i];      }  } 

the code pretty simple, nothing fancy. problem is, if user shakes phone while transitions between 2 viewcontroller (mainviewctrl , detailviewctrl) going on, error:

unbalanced calls begin/end appearance transitions for.

i understand why causes problem.

but how solve it? how somehow stop uigestureevent been fired, while transitions active?

may can add boolean property "isintransit".

set false in viewwillappear,

set true in prepareforsegue (just int i;).

and in motionended (shake method) test if (isintransit=true) -> don't handle shake, don't fire segue.

hop help