gistfile1.m

- (void)createNewPost:(id)sender {
    
    if (!_posts) {
        _posts = [[NSMutableArray alloc] init];
    }
    
    SMPost *p = [[SMPost alloc] init];
    p.postTitle = [NSString stringWithFormat:@"No title %i", _posts.count ];
    p.postBody = @"No body";
    
    [p saveObjectWithCompletion:^(SMPost *post, NSError *error) {
                
                if (error == nil) {
                    
                    NSLog(@"created post on server %@", post);
                    
                    [_posts insertObject:post atIndex:0];
                    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0
                                                                inSection:0];
                    [self.tableView insertRowsAtIndexPaths:@[indexPath]
                                          withRowAnimation:UITableViewRowAnimationAutomatic];
                    
                } else {
                    
                    NSLog(@"error in saving %@", error);
                    
                }
                
            }];
    
}