next view controller is not appearing when i launched apps - iphone

Question

I am getting NSLog message when i am runing apps but nextviewcontroller(welcome page)is not appearing, i want to call nextviewcontroller first time that have a action continue .this screen will appear first time only when we run first time. Condition is working but nextviewcontroller is not coming .I used this code so for
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Configure logging framework
[DDLog addLogger:[DDTTYLogger sharedInstance]];
// Setup the XMPP stream
[self setupStream];
// Override point for customization after application launch.
BOOL launch = [[NSUserDefaults standardUserDefaults] boolForKey:#"LaunchingFirstTime"];
if(!launch){
NSLog(#"first");
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"LaunchingFirstTime"];
[[NSUserDefaults standardUserDefaults] synchronize];
self.viewController1 = [[welcomePage alloc] initWithNibName:#"welcomePage" bundle:nil];
self.window.rootViewController = self.viewController1;
}
else{
NSLog(#"second");
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
self.window.rootViewController = self.viewController;
}
[self.window makeKeyAndVisible];
if (![self connect])
{
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 0.0 * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
//messageTableViewController
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
self.window.rootViewController = self.viewController;
//[navigationController presentModalViewController:settingsViewController animated:YES];
});
}
return YES;

Answer 1

If you are not using story boards and if your window is not an IBOutlet do this.
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//add this
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor=[UIColor clearColor];
BOOL launch = [[NSUserDefaults standardUserDefaults] boolForKey:#"LaunchingFirstTime"];
if(!launch){
NSLog(#"first");
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"LaunchingFirstTime"];
self.viewController1 = [[welcomePage alloc] initWithNibName:#"welcomePage" bundle:nil];
self.window.rootViewController = self.viewController1;
}
else{
NSLog(#"second");
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
self.window.rootViewController = self.viewController;
}

Answer 2

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
BOOL launch = [[NSUserDefaults standardUserDefaults] boolForKey:#"LaunchingFirstTime"];
if(!launch){
NSLog(#"first");
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"LaunchingFirstTime"];
[[NSUserDefaults standardUserDefaults] synchronize];
self.viewController1 = [[welcomePage alloc] initWithNibName:#"welcomePage" bundle:nil];
self.window.rootViewController = self.viewController1;
} else {
NSLog(#"second");
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
self.window.rootViewController = self.viewController;
}
}

Answer 3

If you are using UIStoryBoard , Then try with this
`instantiateViewControllerWithIdentifier` .: application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
BOOL launch = [[NSUserDefaults standardUserDefaults] boolForKey:#"LaunchingFirstTime"];
if(!launch){
NSLog(#"first");
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"LaunchingFirstTime"];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
ViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:#"ViewController_ID"];
self.window.rootViewController = self.viewController1;
}
else{
NSLog(#"second");
self.viewController = // Follow the above
self.window.rootViewController = self.viewController;
}
If you are not working with the Storyboard then please describe your problem briefly` ,.

Answer 4

Use synchronize method to make the user defaults get written on disk immediately.
[[NSUserDefaults standardUserDefaults] synchronize];
From Apple Docs:
synchronize method writes any modifications to the persistent domains to disk and updates all unmodified persistent domains to what is on disk.
It is missing in your code. Write it in if clause.