ios 以编程方式更改 storyBoard 的 rootViewController

Programmatically change rootViewController of storyBoard

提问by Ranjit

I have created my project using Storyboards. The root ViewControllerlies inside a Storyboard, I have not written a single code in the appDelegate.

我已经使用Storyboards. 根ViewController在一个里面Storyboard，我没有在里面写过一个代码appDelegate。

Now I want to show a tour of my app, so I want to change the root ViewControllerfrom Tab Barto my TourVC and when the tour of the app is finished , I want to again switch back my root ViewControllerto Tab Bar.

现在，我想告诉我的应用程序的巡演，所以我想根本改变ViewController从Tab Bar我TourVC，当应用程序的游览结束后，我想我的根再次切换回ViewController至Tab Bar。

So I looked up online and followed the following points

于是上网查了一下，按照以下几点

1) Remove Storyboardsfrom app.plist file, 2) Uncheck option "isInitialViewController" from Storyboardswhich is checked in case of Tab Barcontroller because its a root ViewController, 3) Add this code in appDelegate.m file.

1)Storyboards从 app.plist 文件中删除，2) 取消选中“isInitialViewController”选项Storyboards，在Tab Bar控制器的情况下，它是一个根目录ViewController，3) 在 appDelegate.m 文件中添加此代码。

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
ProductTourViewController *PT = [[ProductTourViewController alloc] initWithNibName:@"ProductTourViewController" bundle:nil];
self.window.rootViewController = PT;
[self.window makeKeyAndVisible];
return YES;

But my app crashes with this error log,

但是我的应用程序崩溃了这个错误日志，

[ProductTourViewController selectedViewController]: unrecognized selector sent to instance 0x1766a9e0

And also I get a warning,

我也收到警告，

Unsupported Configuration: Scene is unreachable due to lack of entry points and does not have an identifier for runtime access via -instantiateViewControllerWithIdentifier:.

回答by Sunny Shah

Objective-C:

目标-C：

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UITabBarController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"tabBarcontroller"];
[[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];

Swift :

斯威夫特：

 let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
 let viewController = mainStoryboard.instantiateViewControllerWithIdentifier("tabBarcontroller") as UITabBarController  
   UIApplication.sharedApplication().keyWindow?.rootViewController = viewController;

Swift 3:

斯威夫特 3：

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
UIApplication.shared.keyWindow?.rootViewController = viewController

回答by Mayank Jain

Set storyboard ID for your class in your main storyboard.

在主故事板中为您的班级设置故事板 ID。

UIStoryboard *MainStoryboard = [UIStoryboard storyboardWithName:@"Main"
                                                                     bundle: nil];

UINavigationController *controller = (UINavigationController*)[MainStoryboard
                                                                           instantiateViewControllerWithIdentifier: @"RootNavigationController"];


LoginViewController *login=[MainStoryboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
            [controller setViewControllers:[NSArray arrayWithObject:login] animated:YES];
self.window.rootViewController=controller;

回答by Nischal Hada

In swift we can implement it is as following

在swift中我们可以实现它如下

let storyboard = UIStoryboard(name: "StartingPage", bundle: NSBundle.mainBundle())      
let loginView: SignInVC = storyboard.instantiateViewControllerWithIdentifier("SignInVC") as! SignInVC
UIApplication.sharedApplication().keyWindow?.rootViewController = loginView

回答by MUHAMMAD WASIM

I use simple this:

我使用简单的这个：

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"NameOfStoryBoard" bundle:nil];
UITabBarController *rootViewController = [sb instantiateViewControllerWithIdentifier:@"NameOfTabBarController"];
[[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];

回答by Aldo Gomez

Just to add to Sunny Shah's answer, this is the Swift 3 version of it:

只是为了添加 Sunny Shah 的回答，这是它的 Swift 3 版本：

        let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let viewController: UIViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainTabBarController") as! UITabBarController
        UIApplication.shared.keyWindow?.rootViewController = viewController

回答by Karan Dua

Swift 3 code:

斯威夫特 3 代码：

Use below in didFinishLaunchingWithOptions Appdelegate function. Replace "HomeViewController" with ViewController you want to set as Root ViewController on app launch.

下面在 didFinishLaunchingWithOptions Appdelegate 函数中使用。将“HomeViewController”替换为您要在应用程序启动时设置为 Root ViewController 的 ViewController。

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

let storyboard = UIStoryboard(name: "Main", bundle: nil)

let initialViewController = storyboard.instantiateViewController(withIdentifier: "HomeViewController")

self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()

return true

回答by Daniel Raouf

Objective c

目标c

step 1: remove main story board from info.plist

第 1 步：从 info.plist 中删除主故事板

step 2: add storyboard id to your view controller in your interface builder

第 2 步：将故事板 ID 添加到界面构建器中的视图控制器

step 3: add the following code to application did finish method in app delegate

第 3 步：将以下代码添加到应用程序委托中的应用程序完成方法中

self.window = [[UIWindow alloc] initWithFrame: [UIScreen mainScreen].bounds];


//set main story board
if( condition){
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"StoryboardName1" bundle:nil];
    UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"ViewController1"];
    [[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];
    [self window].rootViewController = rootViewController;
    [self.window makeKeyAndVisible];
}else{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"StoryboardName2" bundle:nil];
    UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"ViewController2"];
    [[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];
    [self window].rootViewController = rootViewController;
    [self.window makeKeyAndVisible];
}

回答by WaFuNuke

This is an old article, but I will reply. I do not recommend the following code.

这是一篇旧文章，但我会回复。我不推荐以下代码。

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
UIApplication.shared.keyWindow?.rootViewController = viewController

Because you are creating two instances. I recommend writing the following code in the appropriate ViewController.

因为您正在创建两个实例。我建议在适当的 ViewController 中编写以下代码。

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = self