UIBarButtonItem未显示在UINavigationController中

Question

我正在尝试向UINavigationController的导航栏添加2个按钮:

1)左侧的标准"后退"按钮 - 工作,和

2)右侧的"搜索"按钮 - 不显示.

这是代码:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

// 1st button - this shows up correctly:
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] init];
backButton.title = @"MAIN";
self.navigationItem.backBarButtonItem = backButton;    

// 2nd. button - this one does not show up:
UIBarButtonItem *searchButton = [[UIBarButtonItem alloc]
                                           initWithBarButtonSystemItem:UIBarButtonSystemItemSearch
                                           target:self
                                           action:@selector(goSearching:)];
self.navigationItem.rightBarButtonItem = searchButton;


itemsByTitleVC *itemsView = [[itemsByTitleVC alloc] initWithNibName:@"itemsByTitleVC" bundle:nil];


[self.navigationController pushViewController:itemsView animated:YES];

}

谁知道为什么这不起作用？(对于它的价值,我正在使用Xcode 4.2,使用Storyboard ......)

Answer 1

你设置rightBarButtonItem filterButton,但不应该是searchButton？

// 2nd. button - this one does not show up:
UIBarButtonItem *searchButton = [[UIBarButtonItem alloc]
                                           initWithBarButtonSystemItem:UIBarButtonSystemItemSearch
                                           target:self
                                           action:@selector(goSearching:)];
// Here I think you wanna add the searchButton and not the filterButton..
self.navigationItem.rightBarButtonItem = searchButton;