Trouble setting FIrst view controller which will appear on App Startup using Storyboard

Question

I'm setting setting FIrst view controller which will appear on my App Startup. It should appear an UIView first time as a tutorial and, from second time, another standard view. In AppDelegate I wrote this:

#import "AppDelegate.h"
#import "TabBarController.h"
#import "TutorialController.h"

@implementation AppDelegate

@synthesize window;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    if ([@"1" isEqualToString:[[NSUserDefaults standardUserDefaults] objectForKey:@"Startup"]]) {

        TabBarController * viewControllerStandard = [[TabBarController alloc] init];
        window.rootViewController = viewControllerStandard;

    } else {

        TutorialController * viewControllerFirst = [[TutorialController alloc] init];
        window.rootViewController = viewControllerFirst;
        }

    [window makeKeyAndVisible];

    return YES;
}

It doesn't return any alert but, launching app, after splashscreen, it appear only a black screen. Without that codes everything works fine. What could be wrong? Thank you!

EDIT: I'm using Storyboard!

SOLVED: Solved using followben's reply.

Joel · Accepted Answer · 2013-10-20T21:54:21.153

1

You need to initialize the view controllers. For example

#import "AppDelegate.h"
#import "TabBarController.h"
#import "TutorialController.h"

@implementation AppDelegate

@synthesize window;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    if ([@"1" isEqualToString:[[NSUserDefaults standardUserDefaults] objectForKey:@"Startup"]]) {

        TabBarController *viewControllerStandard = [[TabBarController alloc] init];
        window.rootViewController = viewControllerStandard;
        [viewControllerStandard release]; //for non-arc

    } else { 

        TutorialController * viewControllerFirst = [[TutorialController alloc] init];
        window.rootViewController = viewControllerFirst; 
        [viewControllerFirst release]; //for non-arc

    }

    [window makeKeyAndVisible];

    return YES;
}

edited Oct 20 '13 at 21:54

answered Oct 20 '13 at 21:19

Joel

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typing self.viewControllerFirst instead TutorialController * viewControllerFirst it returns this error: Property 'viewControllerFirst' not found on object of type 'AppDelegate *' – Matte.Car Oct 20 '13 at 21:36
You seem to be declaring the variable above. If you are not keeping a reference as a property of AppDelegate, then just declare the variable locally when you initialize. I've updated code above. – Joel Oct 20 '13 at 21:40
In both cases it appear a black screen with white bottom bar (an empty tabBar...). I modified code in question adding #import which I didn't wrote before, is it right? – Matte.Car Oct 20 '13 at 21:45
Edited answer. Try that. – Joel Oct 20 '13 at 21:54
Sorry but probably I'm doing a very big mistake, could you tell me where I'm wrong? Sorry but I'm going crazy!! Thank you so much!! https://copy.com/lZ6LRKBhbuQn4rzN – Matte.Car Oct 21 '13 at 21:03
You didn't mention you were using storyboards in your question. See here for the solution: http://stackoverflow.com/questions/8451975/conditionally-start-at-different-places-in-storyboard-from-appdelegate – Joel Oct 22 '13 at 00:27
Thank you, I didn't thought to tell that I'm using Storyboard. I'm looking that page but, actually, I haven't found a valid solution yet... – Matte.Car Oct 22 '13 at 16:59

score 0 · Answer 2 · edited Oct 20 '13 at 21:53

0

You're not instanciating viewControllerStandard. You'll need something like this unless its been built in Interface Builder.

self.viewControllerStandard = [[TabBarController alloc] init];
self.viewControllerFirst = [[TutorialController alloc] init];
[self.viewController setViewControllers:@[self.viewControllerFirst] animated:NO];
window.rootViewController = self.viewControllerStandard;

edited Oct 20 '13 at 21:53

Joel

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5
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answered Oct 20 '13 at 21:20

David Wong

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Trouble setting FIrst view controller which will appear on App Startup using Storyboard

2 Answers2