iOS - Post and subscribe to NSNotification

notification.m

// declare notification name in something.h
extern NSString* const touchEndNotification;
// define notification name in something.m
NSString* const touchEndNotification = @"StimulusRotationDidEnd";


// post notification
[[NSNotificationCenter defaultCenter] postNotificationName:touchEndNotification object:self];
// subscribe to notification  
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateSurfaceView) name:touchEndNotification object:nil];