Sample project to inspect notification messages during iOS application running.

YTONotificationTest.m

//
//  YTONotificationTest.m
//
//  Created by Yuto Takei on 1/19/14.
//  Copyright (c) 2014 Yuto Takei. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end

@interface NotificationTestViewController : UIViewController
@end

@implementation NotificationTestViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"Add observer");
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(changedAssets:)
                                                 name:NULL
                                               object:NULL];

    [NSTimer scheduledTimerWithTimeInterval:5
                                     target:self
                                   selector:@selector(sendNotification)
                                   userInfo:nil
                                    repeats:NO];
}

- (void)sendNotification
{
    NSNotification *notif = [NSNotification notificationWithName:@"Foobar"
                                                          object:self
                                                        userInfo:nil];
    [[NSNotificationCenter defaultCenter] postNotification:notif];
}

- (void)dealloc
{
    NSLog(@"Remove observer");
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)changedAssets:(NSNotification *)notification
{
    NSLog(@"Received notiication: %@", [notification name]);
}

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = [[NotificationTestViewController alloc] init];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

@end

int main(int argc, char * argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}