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
Swift 4, Xcode 9
在AppDelegate.swift文件中
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let firstVC = storyboard.instantiateViewController(withIdentifier: "firstViewController") as! firstViewController
self.window?.rootViewController = firstVC
}
其他回答
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
几天前我也遇到了同样的情况。一个非常简单的技巧解决了这个问题。 我设置在launch2之前隐藏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,它在viewDidLoad中被设置为可见。否则,执行一个segue到所需的视图控制器。它在iOS 6.1及以上版本运行良好。我确信它适用于早期版本的iOS。
选择要首先打开的视图控制器,然后转到属性检查器。 转到初始场景,检查初始视图控制器选项。
这是你的初始视图控制器在应用启动时首先打开。
谢谢在AppDelegate中修改如下:
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()
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
if (PreferenceHelper.getAccessToken() != "") {
let initialViewController = storyboard.instantiateViewController(withIdentifier: "your View Controller Identifier")
self.window?.rootViewController = initialViewController
} else {
let initialViewController = storyboard.instantiateViewController(withIdentifier: "your View Controller identifier")
self.window?.rootViewController = initialViewController
}
self.window?.makeKeyAndVisible()
return true
}
/*
use your view Controller identifier must use it doubles quotes**strong text**
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