Question

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XCode 4.5.1, Application windows are expected to have a root view controller at the end of application launch

I’m a total noob in IOS app developing.

I use Xcode 4.5.1 with no storyboard.

I’m upgrading an IOS 4 app because it fails to run correctly on IOS 6 devices.
main view containing a question and five answers run once and stops there after user commit by pressing a button with the wanted answer, it should then reload itself with a new question and a new set of questions.

I get the infamous “Application windows are expected to have a root view controller at the end of application launch” in log output.

I’ve read and tried all comments and solutions in 7520971 but to no avail… still getting error and it seems to prevent me to load the view correctly.

here’s what in my appDelegate.h

/*
 *  AnimViewAppDelegate.h
 *  AnimView
 *
 *  Created by Administrateur local on 11-01-19.
 *  Copyright 2011 __MyCompanyName__. All rights reserved.
 *
 */


#import <UIKit/UIKit.h>
#import "RootNavigationController.h"

@interface PPScaleAppDelegate : NSObject <UIScrollViewDelegate> {
    UIWindow *window;
    RootNavigationController *RootNavigationViewController;
}
@property (nonatomic, retain) UIWindow *window;
@property (nonatomic, retain) RootNavigationController *RootNavigationViewController;
@end

my appDelegate.m

//
//  AnimViewAppDelegate.m
//  AnimView
//
//  Created by Administrateur local on 11-01-19.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "PPScaleAppDelegate.h"
#import "QuestionView.h"

@implementation  PPScaleAppDelegate
@synthesize window;
@synthesize RootNavigationViewController;

//- (void)applicationDidFinishLaunching:(UIApplication *)application {

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

    //Create the main screen
    //CGRect frame = [[UIScreen mainScreen] bounds];
    //self.window = [[UIWindow alloc] initWithFrame:frame];
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; //2012


    //Create the main view controller
    RootNavigationViewController = [[RootNavigationController alloc] initWithNibName:NULL bundle:NULL];
    //[window addSubview:RootNavigationViewController.view];

    [self.window setRootViewController:RootNavigationViewController];

    //Show the main window
    [self.window makeKeyAndVisible];

    return YES;
}

- (void)dealloc {
    [window release];
    [super dealloc];
}

@end

.h

//
//  RootNavigationController.h
//  IPhonePPS
//
//  Created by Administrateur local on 11-02-11.
//  Copyright 2011 Le Groupe CDGI Inc. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "QuestionView.h"
#import "ResultView.h"
#import "ResultTableView.h"


@interface RootNavigationController : UINavigationController {

    QuestionView *QuestionViewController;
    ResultView *ResultViewController;
    ResultTableView *ResultTableViewController;

}
@property(nonatomic, assign) QuestionView *QuestionViewController;
@property(nonatomic, assign) ResultView *ResultViewController;
@property(nonatomic, assign) ResultTableView *ResultTableViewController;

-(void)switchToResultMode:(QuestionPath *)QuestionPath;
-(void)switchToResultTableMode;
-(void)switchBack:(BOOL)Reset;
@end

.m

//
//  RootNavigationController.m
//  IPhonePPS
//
//  Created by Administrateur local on 11-02-11.
//  Copyright 2011 Le Groupe CDGI Inc. All rights reserved.
//

#import "RootNavigationController.h"

@implementation RootNavigationController
@synthesize QuestionViewController, ResultViewController, ResultTableViewController;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:nibBundleOrNil {

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {

        // Initialization code.
        QuestionViewController = [[QuestionView alloc] initWithNibName:NULL bundle:NULL];
        ResultViewController = [[ResultView alloc] initWithNibName:NULL bundle:NULL];
        ResultTableViewController = [[ResultTableView alloc] initWithNibName:NULL bundle:NULL];

        //Set the navigation bar hidden
        [self setNavigationBarHidden:YES];

        //Push the question view on the stack
        [self pushViewController:self.QuestionViewController animated:YES];

    }
    return self;
}

- (void)dealloc {
    [super dealloc];
}

-(void)switchToResultMode:(QuestionPath *)QuestionPath {
    [self pushViewController:ResultViewController animated:YES];
    [ResultViewController setQuestionPath:QuestionPath];
}

-(void)switchToResultTableMode {
    [self pushViewController:ResultTableViewController animated:YES];
}

-(void)switchBack:(BOOL)Reset{
    if(Reset){
        if([self.viewControllers count] == 3){
            [self popToRootViewControllerAnimated:YES];
        }else {
            [self popViewControllerAnimated:YES];
        }
        [QuestionViewController resetAnswers];
    }else {
        [self popViewControllerAnimated:YES];
    }
}

//-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
//  if([self visibleViewController] == self.ResultTableViewController || toInterfaceOrientation == UIInterfaceOrientationPortrait){
//      return YES;
//  }else {
//      return NO;
//  }
//}

- (BOOL) shouldAutorotate {
    return YES;
}

-(NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskAll;
}

@end

spent two complete days trying to debug this but I give up and would really appreciate your help with this issue

PR

Answer 1

It would be better to just use [[alloc] init] if you don’t have a nib for your navigation controller. Also, your navigation controller should be initialized with its own rootViewcontroller. I don’t know which one you want to be first, but it should look something like this:

  MyFirstViewControllerClass *rootVC = [MyFirstViewControllerClass alloc] initWithNibName:@"MyFirstViewController" bundle:nil];
  RootNavigationController *nav = [[RootNavigationController alloc]initWithRootViewController:rootVC];
  self.window.rootViewController = nav;