我如何以编程方式设置一个故事板的InitialViewController ?我想打开我的故事板到一个不同的视图这取决于不同的启动条件。
当前回答
斯威夫特5
如果你没有一个ViewController设置为storyboard中的初始ViewController,你需要做两件事:
进入你的项目TARGETS,选择你的项目-> General ->清除Main Interface字段。 总是在项目TARGETS中,现在转到Info ->应用场景清单->场景配置->应用程序会话角色-> Item0(默认配置)->删除故事板名称字段。
最后,你现在可以在SceneDelegate中添加你的代码:
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
guard let windowScene = (scene as? UIWindowScene) else { return }
window = UIWindow(windowScene: windowScene)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
// Make sure you set an Storyboard ID for the view controller you want to instantiate
window?.rootViewController = storyboard.instantiateViewController(withIdentifier: identifier)
window?.makeKeyAndVisible()
}
其他回答
Xcode 12.4 Swift 5
在SceneDelegate.Swift
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScene = (scene as? UIWindowScene) else { return }
let window = UIWindow(windowScene: windowScene)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
window.rootViewController = storyboard.instantiateViewController(withIdentifier: "UserViewController") as! UserViewController
self.window = window
window.makeKeyAndVisible()
}
你可以添加视图控制器场景将要显示的条件
Swift 3:更新到@victor-sigler的代码
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
// Assuming your storyboard is named "Main"
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
// Add code here (e.g. if/else) to determine which view controller class (chooseViewControllerA or chooseViewControllerB) and storyboard ID (chooseStoryboardA or chooseStoryboardB) to send the user to
if(condition){
let initialViewController: chooseViewControllerA = mainStoryboard.instantiateViewController(withIdentifier: "chooseStoryboardA") as! chooseViewControllerA
self.window?.rootViewController = initialViewController
)
}else{
let initialViewController: chooseViewControllerB = mainStoryboard.instantiateViewController(withIdentifier: "chooseStoryboardB") as! chooseViewControllerB
self.window?.rootViewController = initialViewController
)
self.window?.makeKeyAndVisible(
return true
}
Swift 5或以上版本#创建路由视图控制器 如果你使用xcode 11或以上版本,首先初始化var window: UIWindow?在AppDelegate
let rootVC = mainStoryboard.instantiateViewController(withIdentifier: "YOURCONTROLLER") as! YOURCONTROLLER
navigationController.setNavigationBarHidden(true, animated: true)
UIApplication.shared.windows.first?.rootViewController = UINavigationController.init(rootViewController: rootVC)
UIApplication.shared.windows.first?.makeKeyAndVisible()
你可以将Navigation rootviewcontroller设置为一个主视图控制器。 这个想法可以用于根据应用程序需求自动登录。
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
UIViewController viewController = (HomeController*)[mainStoryboard instantiateViewControllerWithIdentifier: @"HomeController"];
UINavigationController navController = [[UINavigationController alloc] initWithRootViewController:viewController];
self.window.rootViewController = navController;
if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_6_1) {
// do stuff for iOS 7 and newer
navController.navigationBar.barTintColor = [UIColor colorWithRed:88/255.0 green:164/255.0 blue:73/255.0 alpha:1.0];
navController.navigationItem.leftBarButtonItem.tintColor = [UIColor colorWithRed:88/255.0 green:164/255.0 blue:73/255.0 alpha:1.0];
navController.navigationBar.tintColor = [UIColor whiteColor];
navController.navigationItem.titleView.tintColor = [UIColor whiteColor];
NSDictionary *titleAttributes =@{
NSFontAttributeName :[UIFont fontWithName:@"Helvetica-Bold" size:14.0],
NSForegroundColorAttributeName : [UIColor whiteColor]
};
navController.navigationBar.titleTextAttributes = titleAttributes;
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
}
else {
// do stuff for older versions than iOS 7
navController.navigationBar.tintColor = [UIColor colorWithRed:88/255.0 green:164/255.0 blue:73/255.0 alpha:1.0];
navController.navigationItem.titleView.tintColor = [UIColor whiteColor];
}
[self.window makeKeyAndVisible];
对于StoryboardSegue用户
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
// Go to Login Screen of story board with Identifier name : LoginViewController_Identifier
LoginViewController *loginViewController = (LoginViewController*)[mainStoryboard instantiateViewControllerWithIdentifier:@“LoginViewController_Identifier”];
navigationController = [[UINavigationController alloc] initWithRootViewController:testViewController];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
// Go To Main screen if you are already Logged In Just check your saving credential here
if([SavedpreferenceForLogin] > 0){
[loginViewController performSegueWithIdentifier:@"mainview_action" sender:nil];
}
谢谢
我认为这是不可能的。 相反,你可以有一个初始控制器它有segue到不同的视图控制器。在启动时,您可以决定以编程方式执行哪个segue。
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