Method does not invoked on Mac OS X 10.8 Mountain Lion

Question

I'm trying to create small application which can be used over Mac OS X 10.8.

On Mac OS X Mavericks and on Mac OS X Yosemite, my application work well but on Mac OS X 10.8, main method of my application does not invoked. To be exact, the method seems to be invoked momentary, but soon after killed with alert sound. I know that Mac OS X 10.8 is a bit strict than the OS after it. But I think there are something wrong with my code which I can't find out.

My main method is OK because if it is called directly, it works fine without any problem. But if I call it in the method of notification selector, the problem occur.

Here's my code. I appreciate any kind of suggestion,thanks.

- (IBAction)startButton:(id)sender {
    NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
    if ( [[defaults objectForKey:@"aBookMark"] length] == 0 ) {
        [self getAudioCDPath];
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(runEncodeAsyncWithNotify:)
                                                     name:NSWindowDidEndSheetNotification
                                                   object:self.window];
    } else {
        [self runEncodeAsync];
    }
}

/* This method have problem */
-(void)runEncodeAsyncWithNotify:(NSNotification *)notification {

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:NSWindowDidEndSheetNotification
                                                  object:self.window];
    encodingFlag = YES;
    [_start setEnabled: NO];
    [_stop  setEnabled: YES];

    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [queue addOperationWithBlock:^{
        [self encodeWithLAME];
    }];
}

/* This method does not have any problem */
-(void)runEncodeAsync {

    encodingFlag = YES;
    [_start setEnabled: NO];
    [_stop  setEnabled: YES];

    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [queue addOperationWithBlock:^{
        [self encodeWithLAME];
    }];
}

Answer 1

My mistake is to use NSWindowDidEndSheetNotification as sheet close notification. [self getAudioCDPath] is a method which presents sheet OpenPanel and this have completionHandler: block in itself. Since what I'd like to do is just to invoke [self runEncodeAsync] , I should write it in the completionHandler: block. No need to use NSWindowDidEndSheetNotification .

So, here's modified code of getAudioCDPath . Sorry I don't show it in the question.

[aPanel beginSheetModalForWindow:self.window completionHandler:^(NSInteger result) {

    if (result == NSFileHandlingPanelOKButton) {

        NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];

        NSURL *aDirURL = [[aPanel URLs] objectAtIndex:0];
        NSData *bookmark = nil;
        NSError *error = nil;
        bookmark = [aDirURL bookmarkDataWithOptions:NSURLBookmarkCreationWithSecurityScope
                     includingResourceValuesForKeys:nil
                                      relativeToURL:nil
                                              error:&error];
        if (error) {
            NSLog(@"Error creating bookmark for URL (%@): %@", aDirURL, error);
        }

        [defaults setObject:bookmark forKey:@"aBookMark"];

        [self runEncodeAsync]; // I added this to invoke main method!!
    }
}];