ios - 在 TabBarController 和 ViewController 之间切换的最佳方法

Question

我一直在尝试一个带有初始登录屏幕的应用程序，然后进入 TabBarController。
我想知道执行此操作的最佳方法是什么，我们将不胜感激。我试过了，但无法从 ViewController 切换到 TabController。

Answer 1

我不确定这是最好的方法，但它又快又脏而且有效。在您的 applicationDidFinishLaunchineWithOptions: 方法中呈现模态视图 Controller 。您应该将 @selector 替换为更适合您想要执行的操作的内容。背景颜色仅用于效果。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = @[viewController1, viewController2];
    self.window.rootViewController = self.tabBarController;


    [self.window makeKeyAndVisible];


    // ***** The relevant code *****
    UIViewController *viewController = [[UIViewController alloc] init];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
    [[viewController view] setBackgroundColor:[UIColor redColor]];
    UIButton *dismissButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [dismissButton setFrame:CGRectMake(10, 10, 300, 44)];
    [dismissButton setTitle:@"Dismiss" forState:UIControlStateNormal];
    [dismissButton addTarget:[self tabBarController] action:@selector(dismissModalViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside];
    [[viewController view] addSubview:dismissButton];
    [[self tabBarController] presentViewController:navigationController animated:NO completion:nil];

    return YES;
}

我通常不想将这种代码放在应用程序委托(delegate)中，但如果它是一次性的，例如登录详细信息，也许没问题。