ipad - ios: pinchGesture that only happen once -

in ios 6, how add pinchgesture detect once?

i have uiview add pinchgesture:

[self addpinchgesturerecognizerstoview:self.view]; 

then attach function pinch call out uiview. problem when pinch, event occur few times, make viewcontroller addsubview many times depend on how many times event occur.

so how can limit 1 time or remove @ moment detect pinch. tried:

[self.view removegesturerecognizer:uipinchgesturerecognizer]; 

but got compile error.

thanks suggestions. thought of simplest solution - add boolean check. rest work charm.