NSNotification in sendEvent:

[bobbiesimpson]

Hi everyone,

I'm trying to capture events on a MKMapView and I came across a thread which suggested that I subclass UIWindow, override the function sendEvent and post a notification within this function. Here it is Intercepting/Hijacking iPhone Touch Events for MKMapView - Stack Overflow

I have implemented it in my code as follows (this is my subclassed UIWindow)

CustomWindow.m

#import "CustomWindow.h"

@implementation CustomWindow

-(void)sendEvent:(UIEvent *)event
{
	[super sendEvent:event];
	
	//	let's send a notification off
	NSDictionary *dictionary = [NSDictionary dictionaryWithObject:event forKey:@"event"];
	NSNotification *note = [NSNotification notificationWithName:@"touchEvent" object:self userInfo:dictionary];
	[[NSNotificationCenter defaultCenter] postNotification:note];
	
	NSLog(@"notification sent");
	
}

@end

And I try to listen for this notification in a view controller as follows:

MapViewController.m

@implementation MapViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
		
		//let's listen for the touch notifications
		NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
		[nc addObserver:self selector:@selector(receivedTouchEvent:) name:@"touchEvent" object:nil];
    }
    return self;
}

-(void)receivedTouchEvent:(NSNotification *)note
{
	NSLog(@"mapView controller has received event");
	NSDictionary *userInfo = [note userInfo];
	NSLog(@"dictionary %@", userInfo);
}

- (void)dealloc {
    [super dealloc];
}

@end

The problem is that I don't receive the notifications in my view controller. Am I missing some fundamental point of NSNotification?