Load a .nib at first app launch - objective-c

Question

I want to show the "intro" nib i made only at first app launch.
I was using the following code in my viewDidLoad but it seems to do nothing (even in ViewWillAppear). I tried to clean, remove the app from simulator and device and build again but nothing happened.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (![defaults objectForKey:#"firstRun"]){
IntroViewController *intro = [[IntroViewController alloc] initWithNibName:nil bundle:nil];
intro.modalTransitionStyle = UIModalTransitionStyleCoverVertical ;
[self presentModalViewController:intro animated:YES];
[intro release];
[defaults setObject:[NSDate date] forKey:#"firstRun"];
}
[[NSUserDefaults standardUserDefaults] synchronize];
I also tried to show a little UIAlertView at first launch, and it works! Am i failing to load the nib?
EDIT
I forgot to say it's a tab Bar based app and i've some code in my app delegate to highlight rows at the first three sessions of the app.
Any help appreciated!

Answer 1

Ok, add the following code and it should work:
- (void)Loadview_afterdelay{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (![defaults objectForKey:#"firstRun"]){
IntroViewController *intro = [[IntroViewController alloc] initWithNibName:nil bundle:nil];
intro.modalTransitionStyle = UIModalTransitionStyleCoverVertical ;
[self presentModalViewController:intro animated:YES];
[intro release];
[defaults setObject:[NSDate date] forKey:#"firstRun"];
}
[[NSUserDefaults standardUserDefaults] synchronize];
}
- (void)viewDidLoad {
[self performSelector:#selector(Loadview_afterdelay) withObject:nil afterDelay:0.5];
}
Apparently, in this case, you can't load a second view right after your view is loaded (viewdidload)
Therefor you just set a small delay before loading your second view.

Answer 2

Try the following:
IntroViewController *intro = [[IntroViewController alloc] initWithNibName:#"IntroViewController" bundle:nil];
intro.modalTransitionStyle = UIModalTransitionStyleCoverVertical ;
[self presentModalViewController:intro animated:YES];
[intro release];
I have added your .nib name to initWithNibName
Also, if you're using iOS 5 (and ARC), you should use this:
IntroViewController *intro = [[IntroViewController alloc] initWithNibName:#"IntroViewController" bundle:nil];
intro.modalTransitionStyle = UIModalTransitionStyleCoverVertical ;
[self presentModalViewController:intro animated:YES completion:nil];

Answer 3

Have you tried moving it to viewDidAppear?

Answer 4

It looks to me that you should place that code in your AppDelegate
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
// Modify the code above to what you need.
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
[application setStatusBarHidden:YES withAnimation:NO];
return YES;
}
It is there that your telling your application what view to start with.
So first time have a firstTimeViewController.
If you are doing it here don't animate the transition in.
Just animate the transition off.
Put a break point and check if you are going into the viewDidLoad method and if so check if your test is appropriate.
I suggest maybe using a BOOL in an NSNumber to check agains.
On top of that you may consider the option to put that in viewDidAppear.

Answer 5

As #Louis already answered the question very well already the only thing is It's just not compatible with the ARC since there are a [ release] What I'll write now isn't new but I'll declare it more for the beginner ones.
First you have to import the TourGuideViewController.h in your RootViewController.h which will be like similarly like this:
#import <UIKit/UIKit.h>
#import "TourGuideViewController.h"
#interface RootViewController : UITabBarController
{
TourGuideViewController *TourGuideViewController;
}
#property (nonatomic, strong) TourGuideViewController *TourGuideViewController;
#end
Then You have to synthesize and implement your function in your RootViewController.m file:
#import "RootViewController.h"
#interface RootViewController ()
#end
#implementation RootViewController
#synthesize TourGuideViewController = _TourGuideViewController;
- (void)viewDidLoad
{
[self performSelector:#selector(LoadTourGuide) withObject:nil afterDelay:0.5];
}
- (void)LoadTourGuide{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (![defaults objectForKey:#"FirstRun"]){
TourGuideViewController *TourGuideVC = [self.storyboard instantiateViewControllerWithIdentifier:#"TourGuideViewController"];
TourGuideVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:TourGuideVC animated:YES completion:NULL];
[defaults setObject:[NSDate date] forKey:#"FirstRun"];
}
[[NSUserDefaults standardUserDefaults] synchronize];
}
#end