iOS: Disable/delete/hide previous ViewController from Segue - ios

In my login logic I have a "AuthenticationViewController" (here the application checks if the user is already logged in). I also use storyboard and all views are based on push segues. And so it looks:
------ AccountViewController
|
--> AuthenticationViewController +
|
------ LoginViewController
Now when I use the UITabbarController and press twice on the tabbar icon "account", the application pops back to the AuthenticationViewController and then to the accountView or to the loginView. I know it's a "blemish" but how can I achieve that when I press twice at the account-icon, the AuthenticationViewController does not get shown? Or do I have a wrong logic?
EDIT
This is how my push-function gets initialized programmatically in the authenticationViewController:
// Delegate to AccountViewController if Data (Username, Password) is correct
if ([strResult isEqualToString:#"1"]) {
AccountViewController *AVC = [self.storyboard instantiateViewControllerWithIdentifier:#"AccountView"];
[self.navigationController pushViewController:AVC animated:NO];
// [self performSegueWithIdentifier:#"authAccountSegue" sender:self];
}
else {
LoginViewController *LVC = [self.storyboard instantiateViewControllerWithIdentifier:#"LoginView"];
[self.navigationController pushViewController:LVC animated:NO];
}

Well there's 2 things I see here, not sure if they'll help towards fixing your problem exactly though. The first is that you could just set up the segues for both actions and there wouldn't be much difference. The other is that looking at your storyboard structure the Login and Account controllers seem to be more suited to be a modal view instead of pushing it onto the stack.

Ok, solved this problem on my own: SUBVIEWS are the key :)

Related

Navigation between Controllers - Black Screens

I'm trying to work on a simple login application which on successful login displays a menu page. On the action sheet of menu page, we have an option of looking at all the users logged in that phone and clicking on any user, it should do some login processing and direct to menu page again. This is how the workflow should go on.
Below is the image that explains it.
All the controllers are connected to segues except for accounts controller and middle controller. Navigation between those two is done using pushViewController as I had to pass some info from accounts controller(table view controller with list of all users) to middle Controller.
MiddleController *maController = [[MiddleController alloc] init];
if (maController.view) {
maController.ma_userId = mo_userId; // Set the exposed property
maController.ma_password = mo_password;
[self.navigationController pushViewController:maController animated:YES];
Middle controller is doing all the process perfectly after getting the details. But directing to menu controller is where I'm facing the problem. If I use a segue between middle controller and menu controller an error is thrown saying no identifier with the name segueName found. But if I use a pushViewController then it is displaying a blank black screen. Can some help me to solve this.
This is how I'm pushing it:
MenuTableViewController *mapMenuTableviewController = [[MenuTableViewController alloc]init];
[self.navigationController pushViewController:mapMenuTableviewController animated:NO];
I've tried all the ways that are posted in previous SO questions, but nothing helped.
Thanks in advance
Try not to alloc-init, but instantiate it fom storyboard like this (you should add it a storyboard id)
YourViewControllerClass *viewController = [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:#"ViewController"];
And then push it.
You need to add storyboard id like this
And use like
UIViewController *viewController = [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:#"ViewControllerID"];
Go to your storyboard, and set an identifier like this :
Now, in your view controller, do this :
YourViewController *viewController = [[UIStoryboard storyboardWithName:#"<your storyboard name>" bundle:nil] instantiateViewControllerWithIdentifier:#"myViewControllerID"];
[self.navigationController pushViewController:viewController animated:NO];
UPDATE -
Push you Accounts view controller and Middle view controller the way i told before.
Then, when your processing is done in the middle controller, just do this :
[[self presentingViewController]presentingViewController]dismissViewControllerAnimated:NO completion:nil];
Add storyboard Id to yput interface builder "SendSMSViewController" and call below code.
let SendSmsVC = self.storyboard?.instantiateViewControllerWithIdentifier("SendSMSViewController") as! SendSMSViewController
self.navigationController?.pushViewController(SendSmsVC, animated: true)
Plz use this code you will go to MenuTableViewController.
for (UIViewController *controller in self.navigationController.viewControllers)
{
if ([controller isKindOfClass:[MenuTableViewController class]])
{
[self.navigationController popToViewController:controller animated:YES];
break;
}
}

How do I return to the first view controller on a storyboard?

Here is the scenario:
The first scene in my storyboard is a login view. It's a UIViewController. When the user is logged in, it shows the home view which is embedded in a navigation controller. I'm adding a log out functionality which should take me back to the first scene in the storyboard which is the login view. How do I do that?
Here is an image of the storyboard showing the login view -> navigation controller -> home view
This is my implementation so far. In the log out action, I clear the session, and pop to root view controller. It does not work because I am still stuck on the home view since it is the root view controller of the navigation controller. However, If I restart the app, the user is logged out and I'm left with the login view.
Code:
[self.navigationController popToRootViewControllerAnimated:NO];
// Set at beginning of storyboard
UIStoryboard *mystoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
app.loginViewController = [mystoryboard instantiateViewControllerWithIdentifier:#"loginViewController"];
Use unwind segues for that.
In your LoginViewController, declare a method with this signature
- (IBAction)unwindToLoginViewController:(UIStoryboardSegue*)segue
Go to your HomeViewController and control drag from your logout button to the Exit button at the top of your view controller window (see screenshot below), then select the unwindToLoginViewController segue. That's it!
U can pop by using navigationController.viewControllers.Get all View Controllers among navigationController,identify it and then pop.If u have pushed the segue from LoginView to HomeView
if([self.navigationController.viewControllers[0] isKindOfClass:[LoginViewController class]])
{
[self.navigationController popToViewController:self.navigationController.viewControllers[0] animated:YES];
}
Hope it helps you...
Try this answer. First you create a navigation controller. make it "is initial View Controller". After that connect login Viewcontroller as a root view controller And connect home controller with facebook button Action.
Navigation Controller -> Login Controller -> Home Controller
Your Storyboard is look like this
After that when you logout from HomeViewController then Just add this method:
-(IBAction)logOut_Action:(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
Its working Fine. Please implement like this and let me know if you face any problem. :)
Try this:
[self.view.window.rootViewController dismissViewControllerAnimated:YES completion:nil];

Going from a Storyboard to Nib and back again

Ok, I'm still pretty new; so, please bear with me.
I'm creating a custom app for a friend that displays a list of work orders in a table view. Clicking on a work order brings them to a detail view. In the detail view, there is a button that uses a push to present another screen called completion view. From the completion view, they click a button that uses the following code to present a nib for signature capture.
SigScreenViewController *sigScreenViewController=[[SigScreenViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil];
[self presentViewController:sigScreenViewController animated:YES completion:nil];
The signature screen uses: https://github.com/jcmontiel/SignatureViewExample for capturing the signature and does it well. I have a button that completes the transaction and sends it back to the table view list.
My problem is that I cannot create a button that will return me to the completion view in the storyboard.
I've tried the following in a button:
[self dismissViewControllerAnimated:YES completion:nil];
or
[self.navigationController popViewControllerAnimated:YES];
I'm open for any suggestions on how I can do it.
Thanks in advance!
Have you tried having the UIViewControllers embedded in a navigation controller ?
Are you pushing from a UIViewController in UIStoryboard to a NIB file?
If so check out this sample project that pushes from storyboard to a NIB:
// in a navigation controller
// to load/push to new controller use this code
// this will be next screen
DetailsViewController *detailsViewController = [[DetailsViewController alloc ]init];
[self.navigationController pushViewController:detailsViewController animated:YES];
// to go back or pop controller use this
// now it will send back to parent screen
[self.navigationController popViewControllerAnimated:YES];

Programatically return to previous ViewController in different storyboard

I tried many answers here but none of them had the same exact scenario.
I'm trying to navigate to a UIViewController that's within a separated storyboard in a different bundle, so far I was able to navigate to it but am unable to return to the previous UIViewController. The method that invokes the external view controller (TabBarController) is implemented as follows:
+(void) launchExternalUI: (UIViewController *) previousViewController {
UIStoryboard* sb = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle: [self frameworkBundle]];
TabBarController *vc = (TabBarController*) [sb instantiateInitialViewController];
[previousViewController.navigationController pushViewController:vc animated:YES];
[vc release];
}
Now the method within TabBarController that should return to the previous view controller:
- (void) navigateToPreviousViewController: (UIGestureRecognizer *)gesture {
[self.navigationController popViewControllerAnimated:YES];
}
In TabBarController, if I print all the viewcontrollers within self.navigationController, all I see is the TabBarController, shouldn't I see the previous view controller that pushed this on launchExternalUI ? The [self.navigationController popViewControllerAnimated:YES]; has no effect at all. I'm a bit lost on this.
It's also important to notice that previousViewController is defined in a local storyboard and TabBarController is implemented in a different .framework, would that cause the issue?
Thanks in advance for all the help!
**Edit: The navigation flow I need is storyboard1:VC1->storyboard2:VC2->storyboard1:VC1, I can get storyboard1:VC1->storyboard2:VC2 part to work but not storyboard2:VC2->storyboard1:VC1
I often split projects up into various Storyboards, and have created a dynamic view controller that handles the task of loading the appropriate controller from a secondary storyboard, whilst maintaining the navigation tree.
I've created a sample project and uploaded to github as it's easier than explaining all the steps here. The key part to note is the User Defined Runtime Attributes for each of the DynamicStoryboardViewControllers in the Main.stoyboard. Note also that each of the secondary storyboards need the "is initial View Controller" checked for one of your viewControllers. Not included in the example is loading a specific scene from a storyboard. This is no more than adding the "sceneName" dynamic runtime attribute much in the same way as the storyboardName attribute is added.
it's a quick sample so a little rough, but you'll get the idea of how it all works. Feel free to ask questions if you get stuck.
Cheers!
EDIT:
It dawned on me that perhaps you don't have a navigationController in the view hierarchy (as i do in my sample). And in any event, seemingly, you won't have much control over where your tab bar is introduces. So without a navigationController the [self.navigationController popViewControllerAnimated:YES] won't work;
You should test for this and either call the popViewControllerAnimated as you do, or call dismissViewControllerAnimated ;
if(self.navigationController){
[self.navigationController popViewControllerAnimated:YES];
}else{
[self.presentingViewController dismissViewControllerAnimated:Yes completion:nil];
}
Hope this helps, if not, perhaps you can supply some sample code.
Create an unwind segue within your original view controller, and use segues instead of pushing/popping view controller views onto the view array.
To create an unwind segue you should create an unwind method in the ORIGINAL viewcontroller:
- (IBAction)unwindToOriginalViewControllerSegue:(UIStoryboardSegue*)sender {
; //TODO: anything special you need, reference via sender
}
Then, in your NEW viewcontroller, in the storyboard, drag from the controller icon to the Exit icon. Link that to the Unwind segue you named above.
UIViewController * YourViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"Storyboard Identifier"];
[self.navigationController pushViewController:YourViewController animated:TRUE];

Clarification on prepareforsegue and presentModalViewController while using Storyboard

I have an app with a LoginViewController as the initial view.
Note: So in appDelegate.m, self.window.rootViewController is NOT the TabBarController.
After Auth, I present the main part of the app, which has a tabbarController (identifier:tabBar) with two tabs and one tab has a navigation controller. I am using Core Data, so I need to pass MOC.
If I use,
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
UITabBarController *obj=[storyboard instantiateViewControllerWithIdentifier:#"tabBar"];
[obj setSelectedIndex:0];// Which tab to show first
[self presentModalViewController:obj animated:YES];
It works good visually. Now I need to pass the MOC. Read about PrepareToSegue method,created a segue (modal, Not shown in pic) from loginVC to my TargetViewController (TabBar>NavigationController1>View1), named the segue "LoginSegue" and used the following code:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
UINavigationController *navController = (UINavigationController *)[segue destinationViewController];
View1 *devicelist = (View1 *)[[navController viewControllers] lastObject];
devicelist.managedObjectContext = managedObjectContext;
}
The TabBar does not show. How do i set the tabbar controller in this case?
I have been trying to get a grasp on getting a reference for the Modal Tabbar, but still not clear. Can some one explain in layman terms how to handle a situation like this?
I think it would be better to use a design that doesn't use a modal transition to the tab bar controller. Modal presentations are generally supposed to be for interruptions to the normal flow of the app, not for getting your main controller on the screen. There are two alternatives, that I think are better. You can leave the login controller as the initial root view controller of the window, but then switch it out for the tab bar controller (which will be the new root view controller of the window, and the login controller will be deallocated). This usually works ok, but I think in this case where you want to pass the MOC from the app delegate (I presume) to a controller in the tab bar controller, I think a second way would be better.
The second way to do this, and the way I usually do login controllers, is to have the tab bar controller be the root view controller of the window, and then present the login controller modally from the viewDidAppear method of the initial view (which would be the one you're calling View1). If you do this presentation with animation set to NO, the login controller will be the first thing the user sees:
-(void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
static int first = 1;
if (first) {
LoginViewController *login = [self.storyboard instantiateViewControllerWithIdentifier:#"Login"];
[self presentViewController:login animated:NO completion:nil];
first = 0;
}
}
The if statement is in there so the presentation doesn't happen again when you come back from the login controller (you could do something more sophisticated like having a delegate call back to View1 from the login controller indicating that the login was successful if you want, but this works).
If the login succeeds, you just dismiss the login controller, and you'll be there in your first view (if it fails, you just never dismiss it, and maybe put up a message saying the login failed).
If you go this route, then you can pass the MOC in the app delegate like this:
UINavigationController *nav = [(UITabBarController *)self.window.rootViewController viewControllers][0];
View1 *devicelist = (View1 *)nav.viewControllers.lastObject;
devicelist.managedObjectContext = managedObjectContext;

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