Define different Initial View Controller Swift

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Define different Initial View Controller Swift

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#1 by (1 votes)

1

I'm doing an app in IOS , in which I check if a user is already registered or not.

If you are registered, I show you a screen, but if it is not registered I show you another one.

How can I do to show one screen or another if I have already defined a Initial View Controller in StoryBoard ??

Here is my code:

if comprobarUsuario(datos) {
   //Existe el usuario, por lo que se va directamente a la app
}
else {
   //No existe el usuario, por lo que se muestra el formulario
}

Thank you!

swift swift2 xcode

asked by 30.06.2016 в 09:56

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1 answer

How to validate what the Android getEventText (event) returns Use the variable of another Sub VBA

score 1 · Accepted Answer

I found this fantastic answer that will be helpful and this one that is specific to swift.

The steps to follow are:

Put a StoryBoard ID on the 2 possible initial screens.

From the StoryBoard do not select any StoryBoard as initial and if you already have it selected, uncheck it.

At this point, check that if you launch the application the warning appears:

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

And the initial screen is nil .

If this is not the case, you have forgotten to unmark the initial StoryBoard. If everything goes well here we continue:

Go to the preferences of the application and:

3.1 preferences - > target - > Info. There eliminates the value of the variable Main storyboard file base name .

3.2 In the tab General removes the value of Main Interface (this eliminates the warning above).

Now we differentiate point 4 (without swift ) and point 5 (with swift )

[WITHOUT SWIFT] In application:didFinishLaunchingWithOptions: you can already create the initial window:

- (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;
}

[WITH SWIFT]

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
}