iOS unable to load views - ios

Question

I am trying to navigate from one view to another on touch of a button using iOS 5.0.
The code I am using
- (IBAction)Actionlogin:(id)sender {
NSLog(#" login button has been pressed");
NSLog(#"In init");
test_details *aSecondPageController=[[test_details alloc]initWithNibName:#"test_details" bundle:nil];
[self.navigationController pushViewController:aSecondPageController animated:NO];
}
I have two xib files test_details_iPhone.xib and test_details_iPad.xib
Inside my testdetails.m
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
NSLog(#"it is coming here in second view");
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
NSLog(#"it has been returned ");
return self;
}
LOGs
2013-04-25 11:06:17.191 app_gototest[3067:207] login button has been pressed
2013-04-25 11:06:17.194 app_gototest[3067:207] In init
2013-04-25 11:06:17.195 app_gototest[3067:207] it is coming here in second view
2013-04-25 11:06:17.196 app_gototest[3067:207] it has been returned
The view is not getting loaded onto the view. I suppose I am missing something.
application:didFinishLaunchingWithOptions: in appDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil];
} else {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPad" bundle:nil];
}
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
** I am trying Jasper Blue's approach**
argc int 1
argv char ** 0xbfffed2c
*argv char * 0xbfffee44
In appDeleagte.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UINavigationController* navigationController;
// Override point for customization after application launch.
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:_viewController];
} else {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPad" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:_viewController];
}
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
return YES;
}

Answer 1

You code looks OK, so it must be that self.navigationController is nil. . . Have you set up a navigation controller?
For your code to work, your current UIViewController needs to be contained within a UINavigationController. . . you can set up the UINavigationController as the root view controller in your application delegate as follows:
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UINavigationController* navigationController;
// Override point for customization after application launch.
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil];
navigationController = [UINavigationController alloc] initWithRootViewController:viewController];
} else {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPad" bundle:nil];
navigationController = [UINavigationController alloc] initWithRootViewController:viewController];
}
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
return YES;
}
NB: You could clean the above code up a little, but you get the picture, which is that you have to set the root view controller to be a navigation controller, like this:
self.window.rootViewController = navigationController;
You could also make a custom root view controller if you like, but the above will let you achieve what you're trying to do - UINavigationController will be used as the navigation system throughout your app.

Answer 2

Your navigation controller is nil. So replace your didFinishLaunchingWithOptions method with
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil];
} else {
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPad" bundle:nil];
}
UINavigationController *navcontroller = navigationController = [UINavigationController alloc] initWithRootViewController:self.viewController];
self.window.rootViewController = navcontroller;
[self.window makeKeyAndVisible];
return YES;
}
Now you have a navigation controller so the call to push method on the self.navigationController should push the second controller.

Answer 3

Please try
- (IBAction)Actionlogin:(id)sender {
NSLog(#" login button has been pressed");
NSLog(#"In init");
test_details *aSecondPageController=[[test_details alloc]initWithNibName:#"test_details_iPhone" bunndle:nil];
[self.navigationController pushViewController:aSecondPageController animated:NO];
}
// test_details_iPhone.xib and test_details_iPad.xib
//Change initWithNibName#"test_details" with test_details_iPhone or test_details_iPad