使用故事板以编程方式设置初始视图控制器

如何以编程InitialViewController为Storyboard设置InitialViewController ？ 我想打开我的故事板到一个不同的视图，取决于从发射到发射可能有所不同的一些条件。

Answer 1

如何没有虚拟的初始视图控制器

确保所有初始视图控制器都有一个Storyboard ID。

在故事板中，取消选中第一个视图控制器的“初始视图控制器”属性。

如果你在这个时候运行你的应用程序，你会看到：

 Failed to instantiate the default view controller for UIMainStoryboardFile 'MainStoryboard' - perhaps the designated entry point is not set? 

你会注意到，你的应用程序委托的窗口属性现在为零。

在应用程序的设置中，转到目标和“ Info选项卡。 有明确的Main storyboard file base name的价值。 在“ General选项卡上，清除“ Main Interface的值。 这将删除警告。

在应用程序委托的application:didFinishLaunchingWithOptions:创建窗口和所需的初始视图控制器application:didFinishLaunchingWithOptions:方法：

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds]; UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; UIViewController *viewController = // determine the initial view controller here and instantiate it with [storyboard instantiateViewControllerWithIdentifier:<storyboard id>]; self.window.rootViewController = viewController; [self.window makeKeyAndVisible]; return YES; } 

Answer 2

对于所有的Swift爱好者来说，这里是@Travis翻译成SWIFT的答案：

在ObjectiveC代码之前做什么@Travis解释。 然后，

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { self.window = UIWindow(frame: UIScreen.mainScreen().bounds) let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) var exampleViewController: ExampleViewController = mainStoryboard.instantiateViewControllerWithIdentifier("ExampleController") as! ExampleViewController self.window?.rootViewController = exampleViewController self.window?.makeKeyAndVisible() return true } 

ExampleViewController将是您想要显示的新的初始视图控制器。

解释的步骤：

1. 用当前窗口的大小创建一个新窗口，并将其设置为我们的主窗口
2. 实例化一个我们可以用来创建新的初始视图控制器的故事板
3. 基于它的Storyboard ID实例化我们的新的初始视图控制器
4. 将我们的新窗口的根视图控制器设置为我们刚启动的新控制器
5. 使我们的新窗口可见

享受和快乐的编程！

Answer 3

你可以在(BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions以编程方式设置关键窗口的rootViewController (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions

例如：

 - (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions { if (shouldShowAnotherViewControllerAsRoot) { UIStoryboard *storyboard = self.window.rootViewController.storyboard; UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"rootNavigationController"]; self.window.rootViewController = rootViewController; [self.window makeKeyAndVisible]; } return YES; } 

Answer 4

您可以将Navigation rootviewcontroller设置为主视图控制器。 这个想法可以根据应用需求用于自动登录。

 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

Answer 5

打开mainstoryboard，选择你想要首先启动的视图，然后打开实用工具 – >属性。 在“视图控制器”下方，您会看到“初始视图控制器”单选按钮。 只要选择它。

—修改的问题：

也许你可以试试这个方法：在你的初始视图的ViewDidLoad部分写一个方法，当方法运行在应用程序启动时，方法触发一个segue到另一个视图。

Answer 6

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 (eg 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 } 

Answer 7

我不认为这是可能的。 相反，你可以有一个初始的控制器，将会有不同的视图控制器。 在启动时，您可以决定以编程方式执行哪个segue。

Answer 8

您可以使用Interface Builder以编程方式设置initial view controller 。

下面是以编程方式使用的方法。

Objective-C：

  self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds]; UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"HomeViewController"]; // <storyboard id> self.window.rootViewController = viewController; [self.window makeKeyAndVisible]; return YES; 

Swift：

  self.window = UIWindow(frame: UIScreen.mainScreen().bounds) let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) var objMainViewController: MainViewController = mainStoryboard.instantiateViewControllerWithIdentifier("MainController") as! MainViewController self.window?.rootViewController = objMainViewController self.window?.makeKeyAndVisible() return true 

Answer 9

我创建了一个路由类来处理动态导航，并保持清洁的AppDelegate类，我希望它也会帮助其他的。

 // // Routing.swift // // // Created by Varun Naharia on 02/02/17. // Copyright © 2017 TechNaharia. All rights reserved. // import Foundation import UIKit import CoreLocation class Routing { class func decideInitialViewController(window:UIWindow){ let userDefaults = UserDefaults.standard if((Routing.getUserDefault("isFirstRun")) == nil) { Routing.setAnimatedAsInitialViewContoller(window: window) } else if((userDefaults.object(forKey: "User")) != nil) { Routing.setHomeAsInitialViewContoller(window: window) } else { Routing.setLoginAsInitialViewContoller(window: window) } } class func setAnimatedAsInitialViewContoller(window:UIWindow) { Routing.setUserDefault("Yes", KeyToSave: "isFirstRun") let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) let animatedViewController: AnimatedViewController = mainStoryboard.instantiateViewController(withIdentifier: "AnimatedViewController") as! AnimatedViewController window.rootViewController = animatedViewController window.makeKeyAndVisible() } class func setHomeAsInitialViewContoller(window:UIWindow) { let userDefaults = UserDefaults.standard let decoded = userDefaults.object(forKey: "User") as! Data User.currentUser = NSKeyedUnarchiver.unarchiveObject(with: decoded) as! User if(User.currentUser.userId != nil && User.currentUser.userId != "") { let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) let homeViewController: HomeViewController = mainStoryboard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController let loginViewController: UINavigationController = mainStoryboard.instantiateViewController(withIdentifier: "LoginNavigationViewController") as! UINavigationController loginViewController.viewControllers.append(homeViewController) window.rootViewController = loginViewController } window.makeKeyAndVisible() } class func setLoginAsInitialViewContoller(window:UIWindow) { let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) let loginViewController: UINavigationController = mainStoryboard.instantiateViewController(withIdentifier: "LoginNavigationViewController") as! UINavigationController window.rootViewController = loginViewController window.makeKeyAndVisible() } class func setUserDefault(_ ObjectToSave : Any? , KeyToSave : String) { let defaults = UserDefaults.standard if (ObjectToSave != nil) { defaults.set(ObjectToSave, forKey: KeyToSave) } UserDefaults.standard.synchronize() } class func getUserDefault(_ KeyToReturnValye : String) -> Any? { let defaults = UserDefaults.standard if let name = defaults.value(forKey: KeyToReturnValye) { return name as Any } return nil } class func removetUserDefault(_ KeyToRemove : String) { let defaults = UserDefaults.standard defaults.removeObject(forKey: KeyToRemove) UserDefaults.standard.synchronize() } } 

并在你的AppDelegate调用这个

  self.window = UIWindow(frame: UIScreen.main.bounds) Routing.decideInitialViewController(window: self.window!) 

Answer 10

使用Swift 3和Swift 4避免强制转型的另一个解决方案就是这样

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { self.window = UIWindow(frame: UIScreen.main.bounds) let storyboard = UIStoryboard(name: "Main", bundle: nil) guard let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewController") as? YourViewController else { return false } self.window?.rootViewController = viewController self.window?.makeKeyAndVisible() return true } 

下面是使用UINavigationController

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { self.window = UIWindow(frame: UIScreen.main.bounds) let storyboard = UIStoryboard(name: "Main", bundle: nil) guard let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewController") as? YourViewController else { return false } let navigationController = UINavigationController(rootViewController: viewController) self.window?.rootViewController = navigationController self.window?.makeKeyAndVisible() return true } 

Answer 11

前几天我遇到了同样的情况。 一个非常简单的技巧解决了这个问题 我在launch2之前隐藏了我的初始视图控制器。 如果初始视图控制器是正确的控制器，它被设置为在viewDidLoad中可见。 否则，执行到所需的视图控制器。 它适用于iOS 6.1及以上版本。 我相信它可以在早期版本的iOS上运行。

Answer 12

感谢您在AppDelegate中对此进行如下修改：

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { //Some code to check value of pins if pins! == "Verified"{ print(pins) self.window = UIWindow(frame: UIScreen.mainScreen().bounds) let mainStoryboard: UIStoryboard = UIStoryboard(name: "HomePage", bundle: nil) let exampleViewController: UINavigationController = mainStoryboard.instantiateViewControllerWithIdentifier("SBHP") as! UINavigationController self.window?.rootViewController = exampleViewController self.window?.makeKeyAndVisible() }else{ print(pins) self.window = UIWindow(frame: UIScreen.mainScreen().bounds) let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) let exampleViewController: UINavigationController = mainStoryboard.instantiateViewControllerWithIdentifier("SBUser") as! UINavigationController self.window?.rootViewController = exampleViewController self.window?.makeKeyAndVisible() } 

Answer 13

找到简单的解决方案 – 无需从故事板中删除“初始视图控制器检查”和编辑项目信息选项卡，并使用makeKeyAndVisible ，只是地方

 self.window.rootViewController = rootVC; 

在

 - (BOOL) application:didFinishLaunchingWithOptions: 

Answer 14

在AppDelegate.swift您可以添加以下代码：

 let sb = UIStoryboard(name: "Main", bundle: nil) let vc = sb.instantiateViewController(withIdentifier: "YourViewController") self.window?.rootViewController = vc self.window?.makeKeyAndVisible() 

当然，你需要实现你的逻辑，根据哪个标准你会选择一个合适的视图控制器。

另外，不要忘记添加一个身份。

Answer 15

选择您想要打开的视图控制器，然后转到属性检查器。 转到初始场景，并检查是初始视图控制器选项。

现在这将是您的初始视图控制器，将在应用程序启动时首先打开。