I'am creating a food ordering app. I have four view controller in my Tab bar. I can add food to the cartView (VC2) from my homeView (VC1). These two are in Tab bar. In my cartView(VC2) i have a button to open the orderView modally (this view is not in my Tab Bar.) After a successful order, i have a button in orderView to get back to my homeView (VC1). but because orderView is presented modally I can't use self.navigationController?.popToRootViewController(animated: true). How should I achieve this? thank you.
You should use the dismiss(animated:,completion:) method to dismiss a presented UIViewController instead of poping since the UIViewController wasn't pushed into the navigational stack and cannot be poped.
dismiss(animated: true)
First you need to dismiss presented screen after that you can use notifications for selecting first tab and popToRootViewController or you can define protocol in your orderView and fire it's method in dismiss completation.
Related
I don't want to let the navigation controller show its navigation bar in the whole project.
Now there are three view controllers
(1) Login view controller
(2) Sign up view controller
(3) Home view controller.
I just hope to use action(which can be triggered by any kind of event, i.e. drag gesture, not necessary the pressing button) to switch between these view controllers. But I found once I get to the "signup view controllers", I can not go back to the login view controller, since there is no "BACK" navigation bar.
Questions:
How "PUSH" in one view controller, then "POP" in the other view controller?
Or there is some different way to solve this problem?
Thank you so much, any suggestion is great.
To programmaticaly go backward in a navigation controller's navigation stack, call this method:
[self popViewControllerAnimated:YES];
When and where you call this is up to how you want your app to flow. Essentially, the default navigation controller calls this automatically when the navbar's back button is pressed. But if you hide the navbar and still need to pop back, you can call this method to pop back.
As for pushing forward, it's simply a matter of creating a Push segue on the storyboard, giving it a name, and then in your code, call this method:
[self performSegueWithIdentifier:#"segue_YOUR_SEGUE_ID" sender:self];
On the question of your app, what probably makes most sense is for the login view be a view by itself. It should contain a modal segue to a sign up view for new users as well as a modal segue to the home view controller (which may or may not need to be embedded in a navigation controller).
Performing a modal segue works exactly the same as a push segue (if you're using storyboards. Hook up the segue, choose a modal segue, then call the performSegueWithIdentifier: method in your code when you need the segue to occur.
Dismissing a modal view is slightly different, but still quite simple. It goes like this:
[self dismissViewControllerAnimated:YES completion:nil];
It's fairly check to do with an 'if' statement...
if (self.navigationController.navigationBarHidden == NO) {
//YOUR ACTION
}
Hope that helps!
I have a Navigation Controller with a View Controller displaying a button. The button is linked to another View Controller using a push segue which automatically adds a top navigation bar with a back button. This all works fine. Pressing the back button slides off the 2nd view and returns to the 1st.
I have a button on the 2nd View Controller, that when pressed runs some code and a delegate call back to the 1st View Controller. Again this works fine.
Now I just need to dismiss the 2nd pushed View from code as if the back button was pressed.
I have tried using dismissModalViewCcontrollerAnimated and dismissViewControllerAnimated, however they both dismiss the whole Navigation Controller which removes view 2 and 1 (returning bak to my main menu).
Whats the correct way to slide off the view.
Obtain a reference to your UINavigationController and call
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
on it.
In Swift it would be calling the method
navigationController?.popViewController(animated: true)
If we use push segue, then use popViewController
#IBAction func backButtonClicked(_ sender: Any) {
self.navigationController?.popViewController(animated: false)
}
In swift you can also call:
self.navigationController?.popToRootViewControllerAnimated(true)
On Objective-C is
[self.navigationController popViewControllerAnimated:YES];
for a jump to the first root controller
[self.navigationController popToRootViewControllerAnimated:YES];
or is a possible move to the specific controller
[self.navigationController popToViewController:(nonnull UIViewController *) animated:(BOOL)];
animation specific animation process of move the controller. If the animation is false the controller will appear without animations.
The UIViewController must be from one which is on the stack.
If NavViewController is used with UIModalPresentationFullScreen then the below line will work
self.navigationController?.dismiss(animated: true, completion: nil)
I have a modal that I am calling presentModalViewController to display from a custom menubar. This menubar is overlaying a viewcontroller that is pushed from a tableView cell.
Now... that all being said, I need to find some way to jump the user back to the root of the tableView from the modal screen. Is this possible? I've been fighting with this for the past couple of hours with no results.
If you're starting from a tablview, drilling down to a detail view via a navigation controller, and then presenting a modal view controller on top of that detail view, you'd have two steps to get back to your list/tableview: First you'd dismiss your modal view controller, then you'd pop your detail view off your navigation stack.
That should put you back where you started (at the tablview), if I'm reading this correctly.
You could pass a reference to the navigation controller to the modal view, and then immediately after calling dismissModalViewControllerAnimated, you can use the reference to the navigationController to pop back to the root view controller.
My application is view based app. First view is login view. After login view i have MainMenuCcontroller which has a tabBarController:
#interface RunnoMainMenuController : UIViewController {
IBOutlet UITabBarController *tabBarController;
}
From login view controller, i am going to MainMenuController using this line of code:
[self presentModalViewController:mainMenu animated:YES];
this controller has 4 tabs. Now i need to do some stuff in viewWillAppear of a tabBarItem. viewWillAppear is not called when i tap a tabBarItem. I have a button in one of those tabBarItem's view which pops up a table view controller using presentModalViewController. This tableView uses dismissModalViewControllerAnimated:YES to disappear it. When i pop up this tableview and dismiss it then viewWillAppear of every tabBarItem works fine. If i will dismiss modalViewController in MainMenuController then it will again go back to login view. How can i dismiss modalViewController without leaving current view or any other solution? Thanks in advance.
You may need to consider how your views are presented. The tab bar controller should always be the window's root view controller. From the Apple docs:
When deploying a tab bar interface, you must install this view as the
root of your window. Unlike other view controllers, a tab bar
interface should never be installed as a child of another view
controller.
Rather than present your login view as the root view and the tab bar as a modal view controller, try it the other way round. The tab bar controller as root, with the login view as presented as a modal view controller from the view controller of whichever tab is shown initially. Dismissing this will then reveal the tab bar controller.
Is there a way to pop the view controller when the user switches tabs?
I have a tabbar with a navigationController on one of the tabs. The user selects a row in a table which pushes a viewController onto the navigationController containing the table. Then the user switches tabs to a new view. In the new view he hits a button that brings him back to the table tab. The problem is that the table inside the navigationController still has a view pushed onto it.
Take a look at the UITabBarControllerDelegate in your situation you could call:
[navigationController popToRootViewControllerAnimated:NO];
when the tabbarcontroller calls it's didSelectViewController delegate method