无法将UIBarButtonItem添加到UITabBarController内的navigationController中

Question

ViewController *VC = [[ViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *NavCon = [[UINavigationController alloc] initWithRootViewController:VC];
NavCon.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(showall)];
[self.myTabBarController setViewControllers:@[NavCon]];

为什么我的导航控制器中没有添加UIBarButtonItem？

- Ayubxon Ubaydullayev

Answer 1

首先，删除/注释以下代码行：

NavCon.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(showall)];

然后把这段代码放到您的导航控制器视图控制器的viewDidLoad方法中。

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(showall)];

- iPatel

Answer 2

您可以像这样做：

UITabBarController *my = [[UITabBarController alloc]init];
    UIViewController *new =  [[UIViewController alloc]init];
    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:new];
    new.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"+" style:UIBarButtonItemStyleBordered target:new action:@selector(addButtonClicked:)];
    [my setViewControllers:@[nav]];

- Vinodh

Answer 3

你能尝试下面的代码吗？

VC.navigationController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(showall)];
[self.myTabBarController setViewControllers:@[NavCon]];

- Prashanth

---

没有，它不起作用，但如果我这样做，它就可以工作了：VC.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"+" style:UIBarButtonItemStyleBordered target:self action:@selector(showall)]; - Ayubxon Ubaydullayev