SaveTasks.m

- (void)saveTasks {
    NSMutableArray *tasksToSave = [NSMutableArray new];
    for (NSInteger i = 0 ; i < 5; i ++) {
        NSString *taskName = [NSString stringWithFormat:@"%d", arc4random_uniform(50)];
        Task *task = [[Task alloc] initWithName:taskName];
        [tasksToSave addObject:task];
    }

    NSString *path = @"~/Documents/";
    path = [path stringByAppendingString:@"FILE_NAME"];
    path = [path stringByExpandingTildeInPath];

    NSMutableDictionary *rootObject = [NSMutableDictionary dictionary];
    rootObject[@"myTasks"] =  tasksToSave; 

    [NSKeyedArchiver archiveRootObject:rootObject toFile:path];

    for (NSInteger i = 0; i < tasksToSave.count; i++) {
        Task *task = tasksToSave[i];
        NSLog(@"Saving task:%@", task.name);
    }
}