UIBarButtonItem title 入 nil 唔好入 @””

用 code 整 nav button … 如果無 title 就入 nil … 入 @”” … 佢會因為其他有 component 郁 而 會移動並出現在 strange position

錯的
UIBarButtonItem *menuButton = [[UIBarButtonItem alloc] initWithTitle:@""
                                                               style:UIBarButtonItemStylePlain
                                                              target:self
                                                            action:@selector(showLeftMenu:)];

對的
UIBarButtonItem *menuButton = [[UIBarButtonItem alloc] initWithTitle:nil
                                                               style:UIBarButtonItemStylePlain
                                                              target:self
                                                            action:@selector(showLeftMenu:)];