Как реализовать уведомления в iOS

Начнем создавать наше уведомление, которое будем демонстрировать пользователю на заблокированном экране.

- (void)save {
    NSString *eventInfo = self.textField.text;
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"HH:mm dd.MMMM.yyyy"];
    NSString *eventDate = [formatter stringFromDate:self.eventDate];
    NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:eventInfo, @"eventInfo", eventDate, @"eventDate", nil];
    UILocalNotification *notification = [[UILocalNotification alloc] init];
    notification.userInfo = dict;
    notification.timeZone = [NSTimeZone defaultTimeZone];
    notification.fireDate = self.eventDate;
    notification.alertBody = eventInfo;
    notification.applicationIconBadgeNumber = 1;
    notification.soundName = UILocalNotificationDefaultSoundName;
    [[UIApplication sharedApplication] scheduleLocalNotification:notification];
}


При установке приложения оно запрашивает разрешение на такие уведомления. Поэтому нужно спросить такое согласие у пользователя.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) {
        UIUserNotificationType userNotificationTypes = (UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound);
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:userNotificationTypes
                                                                                 categories:nil];
        [application registerUserNotificationSettings:settings];
        [application registerForRemoteNotifications];
    }
    return YES;
}


- (void)applicationDidBecomeActive:(UIApplication *)application {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    application.applicationIconBadgeNumber = 0;
}

Очистим симулятор и запустим приложение.

Запустим приложение.

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