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Conditionally start at different places in storyboard from AppDelegate
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Closed 9 years ago.
Im looking for a way to change the starting view within the storyboard. I have 2 different views, one for a tutorial and the other one is the app itself. I want to load the tutorial the first time the app is loaded and next time it should just be the app itself. How can I do this with code?
Are you trying to do it from a nibfile or in the AppDelegate?
In the first case, just check the flag "Is Initial View Controller".
in the second you must put your controller as RootViewController, like this:
- (BOOL)application:(UIApplication *)app didFinishLaunchingWithOptions:(NSDictionary *)options{
UINavigationController *navController = (UINavigationController *)self.window.rootViewController;
MenuViewController *menu = [navController.storyboard instantiateViewControllerWithIdentifier:#"MenuController"];
CustomViewController *custom = [navController.storyboard instantiateViewControllerWithIdentifier:#"CustomController"];
// First item in array is bottom of stack, last item is top.
navController.viewControllers = [NSArray arrayWithObjects:menu, custom, nil];
[self.window makeKeyAndVisible];
return YES;
}
Check these links fir first time app launch First iPhone Launch and First Launch
When u find app is launching first time load or push ur tutorial ViewController else load your default View controller as per ur need.
A way to do it with less code is to create a third view controller, call it root view, which will always be the first to load, then inside this view you check
which view to load next, either the tutorial or the app view.
Give each view a storyboard ID
call the tutorial view: #"tutorialMainView"
and the app view: #"appMainView"
Then from within the root view you can load it as follows:
NSString *viewName = #"tutorialMainView";
UIViewController *tempView = [[UIStoryboard storyboardWithName:#"my_storyboard" bundle:nil] instantiateViewControllerWithIdentifier:viewName];
It's up to you what to do afterwards, either push it, or have it replace the current rootView (I recommend setting it as the new rootViewController)
1.Go to storyboard
2.click on th view you want to make first
look at this picture and set initial controller as it is in image
Related
I am a newbie to iOS world and have started building custom code on top of a templated code.
So excuse me for the obvious.
The View chain starts with a MainWindow.xib which contains a App Delegate Object, a Window Object and Application ViewController. I dont understand why those objects are needed over there. But what I understand, I need to mention starting ViewController in the "Nib Name" Property to initiate my custom View Controller (called "EmptyViewController"). Its a dummy view controller, just there to avoid crash to happen as a result of missing valid viewcontroller.
I initiate a separate Modal View Controller(MainViewController) inside didFinishLaunchingWithOptions.
Code for initiating modal View Controller --
self.window.rootViewController = self.viewController;
mainView = [[MainViewController alloc] initWithNibName:#"MainViewController" bundle:nil];
// present the viewcontroller
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:mainView];
[self.viewController presentModalViewController:navController animated:NO];
// release it, because it's retained as modalViewController
[navController release];
I do not put this MainViewController inside MainWindow.xib as I want to have navigation at the root of MainViewController.
Inside MainViewController, I push HelpViewController when "help" button is pressed.
But HelpViewController does not show any navigation bar. I do not understand why?
Code for Pushing Navigation bar --
HelpViewController *helpVC = [[HelpViewController alloc] init];
[self.navigationController pushViewController:helpVC animated:YES];
[helpVC release];
So I would like to understand --
1) Why is MainWindow.xib needed? Can I remove it? (Note: I tried to remove it, but then I get blank screen)
1.a) Why are all the controls/objects App Delegate Object, a Window Object and Application ViewController objects needed?
2) Why doesnt HelpViewController show Navigation bar?
3) Another thing I noticed, if I say self.presentingViewController, EmptyViewController handle is returned while popViewController returns me back to MainViewController.
Thanks
The App Delegate simply implements some app-level 'callbacks' by which iOS communicates with your own code. In main.m you can see how iOS is told which of your classes implements UIApplicationDelegate. iOS creates an instance of this class and call these delegate methods ('callback') whenever appropriate (e.g. when the app goes to background).
The Window is something iOS provides, your app needs to tell what to display on it. And, as you saw, this is usually done in didFinishLaunchingWithOptions (which is called by iOS to inform your app things are ready to get started).
A View Controller is a class that handles states of stuff you show on the Window. You don't show stuff directly on the Window, but instead use Views. Every View Controller has a View with UI elements.
The XIB or NIB is a UI description/layout file. A XIB and View are linked together; you need to tell the XIB to which View Controller member (e.g. a UILabel) a UI element belongs, and you tell the XIB which View Controller method to call on a certain UI event (e.g. user taps on a button).
These are the basics. I'm aware it does not answer all your questions; I suggest you read the very good Apple documentation. Don't try to understand everything immediately as things, as you're experiencing, indeed can seem illogical at start.
What is the right way to change XIB View which loaded at app start depending on some app settings. Of course I know how to get all settings I need.
In your application's delegate, in the method
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
if(yourSettings)
myViewController = [[MyViewController alloc] initWithNibName:#"FirstNibName" bundle:nil];
else
myViewController = [[MyViewController alloc] initWithNibName:#"SecondNibName" bundle:nil];
self.window.rootViewController = self.myViewController;
[self.window makeKeyAndVisible];
return YES;
}
And that's it. Probably you may want to save your settings in your user defaults so you can load the view properly.
However, I would use 2 different view controllers, as you probably want them to do different things, not just modify some graphics.
EDIT-
Let me see if I understand. You will always load the first view controller and, if some conditions are met, you modally want to present the second view controller that will get dismissed at some point, returning the user to the first view controller. If this is the case, I suggest you move the code in your first view controller, in viewDidLoad or better yet in viewDidAppear, as this view controller will always get loaded. Also this way the user can see that he will eventually go to that view controller. I use something like this in applications the user needs to login to so that it will be obvious for him that he cannot continue until he does login.
I can't say that this is the right way to do it, because it's up to the programmer how he arranges his code, but it would seem to me that the place that controls what view and how it appears belongs in a view controller and not in the delegate, especially considering that your first view controller always gets loaded. It should be up to that view controller to see if it presents the second one or not.
I'm developing my first iPhone app, which is a navigation based one. I want to know how I can use icons/buttons like this app in the root view to control navigation instead of the default table cell view.
I would appreciate some step by step guide since I'm sort of newbie and didn't get how to do this, reading the documentations, or similar questions.
Rather than starting with a Navigation based app, start with a window based app and create an instance of UINavigationController in app delegate (in method appDidFinishLaunching) and set any UIviewController as it's root view controller. You can then do whatever customizations in that view controller
Finally set the navigationController as rootviewController of you application window.
UIViewController *myCustomRootViewController = [[UIViewController alloc] init];
UINavigationController *myNavController = [[UINavigationController alloc] initWithRootViewController:myCustomRootViewController];
[myCustomRootViewController release];
self.window.rootViewController = myNavController;
[myNavController release];
You really need to use google, or anywhere else on Stack Overflow before you ask a question. I found this in a minute. If you're adding to a navigation controller (which is what handles views in a table view), then use – pushViewController:animated: instead of presentModalViewController:animated: And after you push or present a view controller, don't forget to release it if you are not using automatic reference counting.
I am new to iphone development. I am developing an iphone application which contains four tabs. I have implemented it using tab bar controller. But now i need to show a login screen without tabs before tab bar controller. I have tried so many methods but didnt get the one i wanted.
Can anyone pls explain how to do this with a code snippet??
Create a new class LoginViewController. When your application launches then add the view to the window. Now when login is successful then remove it from superview and add the MainController.
Create a subclass of UITabBarController (though it's not advised by apple), but for this purposes it should be ok and do this in viewWillAppear
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
BOOL isLogged in = //do something to determine if you're logged in
if(!loggedIn){
LoginViewController *loginViewController = [[LoginViewController alloc] initWithNibName:#"LoginViewControllerNibHere" bundle:nil];
[self presentModalViewController:loginViewController animated:YES]; //or NO if you don't want it animated
[loginViewController release];
}
}
Or add this to a category for UITabBarController and import it in the app delegate or wherever you're using the UITabBarController
Create a new UIViewController subclass with a nib that represents your login screen (I'll refer to it as SignInViewController).
Open your MainWindow.nib file and add a new UIViewController
Set the new UIViewController's class type to SignInViewController
Set the UIWindow's rootViewController outlet to the new SignInViewController
Now create a new nib file and copy your existing UITabBarController to it (it's best to split nibs rather than having a single-mega nib)
Back in your MainWindow.xib change the existing UITabBarController's attributes to specify the nib name that you just created
Check this Link's source code,
it uses Login Controller as modal view with 4 tabs
http://code.google.com/p/tweetero/source/checkout
Also i tried this way ,
in my first tab view - in viewDidAppear - i'll check Login = YES then
show the LoginController
- [self.tabbarcontroller presentMOdalViewcontroller:LoginView animated:YES];
so every time u click on first tab - if u need to Login put a flag - check it & show Login View
Hope this Helps.
The best way to do this is to create a new LoginViewController as other people have mentioned and then set your rootviewController to tabBarcontroller as soon as you authenticate the user. Here is how you can do this in swift, this is snippet to put as soon you authenticate your user in LoginViewController
let tabBarController = self.storyboard?.instantiateViewControllerWithIdentifier("TabBarController") as! UITabBarController
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDelegate.window?.rootViewController = tabBarController
Where TabBarController is the storyboard id of your tab bar controller. It could be anything whatever name you have given it.
I created a new Navigation Based Application project.Then in MainWindow.xib I added a button to the navigationbar. I would like to push a new View onto the screen where I can enter information, which will be added as an object to the array of the UITableView.
But I don't know where to write the IBAction to link the button to (Appdelegate or the RootViewController)? Because as you see in the screenshot, it resides in MainWindow.xib because the RootViewController is merely a Table and doesn't contain the navigation. But in the document view of MainWindow.xib it is located under the RootViewController.
Do I have to create a new View Controller inside the XIB as well and create an IBOutlet for it?
I tried putting the code inside my AppDelegate and reference the button to the delegate but it doesn't work.
Please help. Thanks in advance.
See the screenshot here: http://i56.tinypic.com/5djbcm.png
When you ask yourself a question "where does this action belong" it's most probably a controller because controllers handle event flows in your app. Next question - "What controller is in charge when this action happens? What controller is most interested in this action?". Answer in your case is root table controller (RootViewController instance). Create an IBAction method in it which will push form controller (one you use to enter information) to navigation controller.
// somewhere in RootViewController.m
- (IBAction)addNewEntry {
NewEntryFormController *c = [[[NewEntryFormController alloc] init] autorelease];
// ...
[self.navigationController pushViewController:c animated:YES];
}