Segue from LaunchScreen to a viewController in Main.Storyboard?

问题

I got some logic I want to do in my LaunchScreen, and if the check is alright, I want to segue to a viewController and if not I want to segue to another, is that possible?

回答1:

I got some logic I want to do in my LaunchScreen

Now that I understand the question, I can answer it: don't. Do your time-consuming logic later. Your job is to launch fast. You need to get out of applicationDidFinishLaunchingWithOptions, get out of viewDidLoad, and launch.

What you show at that point is up to you; if you have time-consuming stuff (in your case, it sounds like you're networking or doing something else that takes time while you load up the data source for a table) and you want to show a special view controller that covers the time with a spinning activity view or something, fine. But during actual launch is not the time to do that.

回答2:

Your LaunchScreen is shown while your app is loading. Go to your AppDelgate:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

    window.rootViewController = //your root view controller that you have figured out with logic

    return true
}

回答3:

No you cant code for launchScreen.Storyboard, The reason why :- when your launchScreen.storyboard shows the app is still loading.

Simply put: You cant access your app when it is displaying launchScreen.storyboard, all you can do is make a UI/UX for that not execute any code for it.

Alternative:- Make a viewController that appears as a first viewController check your logic there and do things from there accordingly!

Reference : - https://stackoverflow.com/a/27642160/6297658

回答4:

Run your check in didFinishLaunchingWithOptions() and use that to "jump" directly to a specific vc. Here's an example using userDefaults, but of course you can replace that with whatever check you're running.

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        // Do some logic

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let welcomeVC = storyboard.instantiateViewControllerWithIdentifier("WelcomeNavController")
            self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
            self.window?.rootViewController = welcomeVC
            self.window?.makeKeyAndVisible()
        }
}

回答5:

Add this function into the AppDelegate:

func initialVC(storyboardID: String) {

    let mainStoryboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let initialViewController : UIViewController = mainStoryboard.instantiateViewControllerWithIdentifier("\(storyboardID)") as UIViewController
    self.window?.makeKeyAndVisible()

    if storyboardID == "tabBarVC" {

        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        self.window?.rootViewController = initialViewController

    } else {

        let navController = UINavigationController(rootViewController: initialViewController)
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        self.window?.rootViewController = navController

    } 
}

In the didFinishLaunchingWithOptions method inside of the AppDelegate, you can add this:

if currentUser != nil {

    initialVC("tabBarVC")

} else {

    initialVC("loginVC")

}

You can see in my example, I am either loading the main app VC or the Login VC depending on if the user is logged in. In your case, You can use an if - else statement and do the logic within the initialVC function.

Note: When I call for the loginVC to be loaded, I have to load the navigationController because the loginVC is embedded in a navigationController. For the tabBarVC, I don't embed the navController because it isn't needed.

来源：https://stackoverflow.com/questions/39231395/segue-from-launchscreen-to-a-viewcontroller-in-main-storyboard

标签

ios

swift

viewcontroller

launch-screen