root view controller when upgrading app to ios 6 [duplicate] - ios

Question

This question already has an answer here:
Closed 10 years ago.
Possible Duplicate:
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;

Answer 2

You're calling [self.window setRootViewController:RootNavigationViewController]; Notice - setRootViewController. It wants a viewController. Your RootNavigationViewController is a NavigationController as referenced here #interface RootNavigationController : UINavigationController not a viewController.
It looks like you should do something like this
RootNavigationViewController = [[RootNavigationController alloc] initWithNibName:NULL bundle:NULL];
[window makeKeyAndVisible];
[window addSubview:RootNavigationViewController.view];
(referenced from Programmatically build / navigate a Navigation Controller)
I'm not sure if using
[self pushViewController:self.QuestionViewController animated:YES];
in the RootNavigationViewController is the same as doing something like this
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
But that should point you in a good direction to debug your issue.

Answer 3

You should init your RootNavigationController with a rootViewController first :
[RootNavigationController initWithRootViewcontroller:QuestionViewController];
You can find this from the UINavigationController reference :
Because the UINavigationController class inherits from the
UIViewController class, navigation controllers have their own view
that is accessible through the view property. When deploying a
navigation interface, you must install this view as the root of
whatever view hierarchy you are creating.
For instance, in -(void)switchBack:(BOOL)Reset; you popToRootViewController without even having set it.