ios - 跳出 UINavigationBar 后获取 UITabBar

Question

我有一个 UINavigationBar，里面有一个 AuthenticateViewController。然后当用户在我的导航控件的右上角登录时，我想显示一个 UITabBar Controller 。我仍然在 appDelegate 中创建它吗？如何“突破”UINavigation Controller ？

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.

// Add methods for layout of this view controller here

//1
AppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
//2
self.managedObjectContext = appDelegate.managedObjectContext;

[self.navigationItem setHidesBackButton:YES];

// Now add the Sign In button
UIBarButtonItem *signinButton = [[UIBarButtonItem alloc] initWithTitle:@"Sign In" style:UIBarButtonItemStylePlain target:self action:@selector(signinButtonPressed:)];

self.navigationItem.rightBarButtonItem = signinButton;
}

- (void) signinButtonPressed:(UIBarButtonItem *) sender
{
    // What goes here to start the UITabBars
}

Answer 1

登录后将您的TabBarController设置为rootViewController。

您的按钮操作将如下所示:

UITabBarController *tabBarController = [[UITabBarController alloc] init];
tabBarController.viewControllers = @[<your viewControllers>];

AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
[appDelegate.window setRootViewController:tabBarController];

编辑:您可能不会使用 @[] 来创建数组。所以这里有一个解释:

UIViewController *viewController1 = [[UIViewController alloc] init];
UIViewController *viewController2 = [[UIViewController alloc] init];

// Two methods of adding item to array

// First method
NSArray *array = [NSArray arrayWithObjects:viewController1, viewController2, nil];

// or 
NSArray *array = @[viewController1, viewController2];

tabBarController.viewControllers = array;