iphone - 将 UIBarButtonItems 添加到工具栏时出现问题

Question

我有一个带有 UITableViewController 的 UINavigationController。我想在底部显示一个带有 UIBarButtonItem 的工具栏。工具栏出现了，但按钮不会出现。谁知道为什么？

  - (void)viewDidLoad {
        [super viewDidLoad];
     [[self navigationItem] setTitle:@"Selections List"];
     [[self navigationItem] setRightBarButtonItem:[[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addProjectSearch:)] autorelease]];
        [[self navigationItem] setLeftBarButtonItem:[self editButtonItem]];
     [[super tableView] setDataSource: self];
     [[super tableView] setDelegate: self];

     //Toolbar 
     UIBarButtonItem * logoutButton = [[[UIBarButtonItem alloc] initWithTitle:@"Log out" style:UIBarButtonItemStylePlain target:self action:@selector(logOut:)]autorelease];
     NSMutableArray * arr = [NSMutableArray arrayWithObjects:logoutButton, nil];
     [[self navigationController] setToolbarHidden: NO animated:YES];
     [[self navigationController] setToolbarItems:arr animated:YES]; 
    }

Answer 1

替换这一行:

[[self navigationController] setToolbarItems:arr animated:YES];

用这个:

[self setToolbarItems:arr animated:YES];

一般来说，您应该在您推送的每个单独的 View Controller 上设置 toolbarItems，而不是在您的 UINavigationController 本身上。