Why is adding a navigation controller making my array disappear? - ios

Currently I have a UIViewController with a couple of buttons that when pressed move to a UITableViewController. Each button loads a specific array of data to the UITableViewController by identifying the segue of the specific button and displaying the corresponding data.
This works fine as is.
However I wish to add an embedded UINavigationController so I can navigate through the UITableViewController and and corresponding views while still being able to 'press back' to the initial UIViewController.
Firstly, where am I meant to put this. I tried over the tableViewController and 2 things happen -
a) If the segues still go to the UITableViewController, there is no navigation displayed.
b) If I move the segues to go to the UINavigationController, none of my arrays show in the tableViewController, but I do have navigation.
Where do I link my segues or where do I embed the UINavigationController so this works?
(I haven't put any code as I don't think this will involve it, but if it does just let me know and I will add).
Not sure if I'm missing something but, it's not working. I want to be able to still utilize the buttons I already have and not use the buttons on the navigation from the UIViewController to the UITableViewController.
For Hiding the Navigation on root
- (void)viewWillAppear:(BOOL)animated {
[self.navigationController setNavigationBarHidden:YES animated:animated];
[super viewWillAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated {
[self.navigationController setNavigationBarHidden:NO animated:animated];
[super viewWillDisappear:animated];
}

The ViewController which has 2 buttons can be made as rootViewController to the NavigationController. The NavigationController can be added to the window.
Window -> NavigationController -> UIViewController (as rootView)
Hope this helps.

Select the root view controller->editor->embed in->navigation controller

Related

popViewController not working with storyboards

I create a UINavigationController (as a initial screen) and connect them with my UITableViewController (as a root).
Next, I create another UINavigationController and connect with my UIViewController. Inside my UITableViewController I connect my first cell with UINavigationController (That was connected with my UIViewController) (Segue -> show).
When I run the project my table appears, when I select my first row, my UIViewController appears. Thats great!
When I was in my UIViewController the back bar button doesn't appears, in my case I create a left bar button, that will run a function to dismiss that view and go back to my UITableViewController, for that I use many codes:
-(void)back{
NSLog(#"Called");
[self.parentViewController.navigationController popViewControllerAnimated:YES];
}
-(void)back{
NSLog(#"Called");
[self.navigationController popViewControllerAnimated:YES];
}
-(void)back{
NSLog(#"Called");
[self.navigationController popViewControllerAnimated:YES];
}
But all of they doesn't works and my view don't dismiss, how can I solve this problem?
The problem is that your navigation controller, that you call from your table view cell, has only a single view controller (yours) on its navigation stack. So it cannot pop anything from this stack, else the stack were empty.
What you have to do instead is to dismiss the navigation controller itself.
I think that the solution would be to remove the second navigation controller. Since the TableView is already embedded inside a Navigation Controller, the show segue to the UIViewController must be directly connected to it.

UINavigationController back button return to FIrstTableViewController

So I was create three UITableViewControllers with UINavigationController. I want a back button on 3rd UITableViewController, what returns my view to first UITableViewController instead of second.
How can I do that? That must be a real backButton, not a image or something else. Will be perfect to do this only with storyboard.
UPDATE
Perhaps I poorly explained what I want.
I don't want use any button with action on it. I just want something like as setting "address" of 1st TableViewController on my default back button. There is any way to do it?
add a button and connect it to following action
- (IBAction)backToFirstView:(UIButton *)sender
{
[self.navigationController popToRootViewControllerAnimated:YES];
(or)
[self.navigationController popToViewController:yourFirstViewControllerObject animated:YES];
}
There are different ways to navigate from DetailViewController to other view controllers.
We will go through the cases one by one.
First of all I would like to clear that if its your default
navigation bar's back button, then it must return to the last most
view controller only which is actually a default behavior of a
navigation controller.
Second, If you would like to go back to the
last most view controller on the tap of a button placed by you, you
should write the following code
[self.navigationController popToViewController:NAME_OF_A_VIEWCONTROLLER animated:YES];
Third, If you would like to go to the first view controller from where you
started, you should write the following code
[self.navigationController popToRootViewControllerAnimated:YES];
Ok, I found a way to resolve my problem. Thanks for your answers guys, they was very helpful.
So for resolve this problem you just need use link what give me Kumar KL upper, and wrote next method in your UITableVIewController
-(void) viewWillDisappear:(BOOL)animated {
if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
// Navigation button was pressed. Do some stuff
[self.navigationController popViewControllerAnimated:NO];
}
[super viewWillDisappear:animated];
}
Now you got a backButton what redirect you to your viewController, BUT title of this button is wrong. Let's resolve that unfair.
Create new class CustomSegueцрфе inherited from UIStoryboardSegue with next code in CustomSegue.m :
- (void)perform
{
UIViewController *sourceView = (UIViewController *) self.sourceViewController;
UIViewController *destinationView = (UIViewController *) self.destinationViewController;
[[destinationView navigationItem] setTitle:#"TitleOfYourViewController" ] ;
[sourceView.navigationItem setTitle:#"TitleOfButton"] ;
[sourceView.navigationController pushViewController:destinationView animated:YES];
}
Now you can go to storyboard and connect 2nd ViewController with 3rd with custom segue.
Like you see UINavigationController uses Title of previous ViewController for button title, so you just need change it.

Using multiple storyboards with a TabBarController

Okay, so in the process of developing my newest app, I found that my storyboard got huge, so in an effort to clean it up some, i have divided it into multiple storyboards before it gets out of hand. just for settings alone i have roughly 20 tableviewcontrollers that branch out from a root NavigationController. That navigationcontroller was a TabItem on a TabBarController, which is the application's root view controller.
I've moved the TabBar into it's own StoryBoard as the Root_Storyboard and the Navigation controller is now the initial view of the Settings_Storyboard.
Just for testing purposes, I placed a few UIViewControllers as tab items in the TabBarController (Root_Storyboard) and subclassed one and added the following code to it's viewWillAppear method. It works great, but I know that the presentViewController displays the NavigationController modally and hides the tabBar. Obviously I don't want that, how do I get it to push properly so that the TabBar remains visible?
- (void) viewWillAppear:(BOOL)animated {
UIStoryboard *settingsStoryboard = [UIStoryboard storyboardWithName:#"Settings_iPhone" bundle:nil];
UIViewController *rootSettingsView = [settingsStoryboard instantiateInitialViewController];
[self.tabBarController presentViewController:rootSettingsView animated:NO completion:NULL];
}
Edit - To clarify. The above code is the subclassed method for a UIViewController (child of UITabBarController:index(1)) in the Root_iPhone.storyboard. The UINavigationController/UITableViewController that I am trying to load is found in Settings_iPhone.storyboard. Not sure how to implement the linkView suggested below in this situation.
This is quite possible and a smart move - decluttering your Storyboards presents cleaner interface files to dig through, reduced loading times in XCode, and better group editing.
I've been combing across Stack Overflow for a while and noticed everyone is resorting to Custom Segues or instantiating tab based setups programmatically. Yikes. I've hacked together a simple UIViewController subclass that you can use as a placeholder for your storyboards.
Code:
Header file:
#import <UIKit/UIKit.h>
#interface TVStoryboardViewController : UIViewController
#end
Implementation file:
#import "TVStoryboardViewController.h"
#interface TVStoryboardViewController()
#property (nonatomic, strong) UIViewController *storyboardViewController;
#end
#implementation TVStoryboardViewController
- (Class)class { return [self.storyboardViewController class]; }
- (UIViewController *)storyboardViewController
{
if(_storyboardViewController == nil)
{
UIStoryboard *storyboard = nil;
NSString *identifier = self.restorationIdentifier;
if(identifier)
{
#try {
storyboard = [UIStoryboard storyboardWithName:identifier bundle:nil];
}
#catch (NSException *exception) {
NSLog(#"Exception (%#): Unable to load the Storyboard titled '%#'.", exception, identifier);
}
}
_storyboardViewController = [storyboard instantiateInitialViewController];
}
return _storyboardViewController;
}
- (UINavigationItem *)navigationItem
{
return self.storyboardViewController.navigationItem ?: [super navigationItem];
}
- (void)loadView
{
[super loadView];
if(self.storyboardViewController && self.navigationController)
{
NSInteger index = [self.navigationController.viewControllers indexOfObject:self];
if(index != NSNotFound)
{
NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];
[viewControllers replaceObjectAtIndex:index withObject:self.storyboardViewController];
[self.navigationController setViewControllers:viewControllers animated:NO];
}
}
}
- (UIView *)view { return self.storyboardViewController.view; }
#end
Description:
The view controller uses its Restoration Identifier to instantiate a storyboard in your project.
Once loaded, it will attempt to replace itself in its
UINavigationController's viewController array with the Storyboard's
initial view controller.
When requested, this subclass will return the UINavigationItem of the Storyboard's initial view controller. This is to ensure that navigation items loaded into UINavigationBars will correspond to the view controllers after the swap.
Usage:
To use it, assign it as the subclass of a UIViewController in your Storyboard that belongs to a UINavigationController.
Assign it a Restoration ID, and you're good to go.
Setup:
And here's how you set it up in the Storyboard:
This setup shows a tab bar controller with navigation controllers as its first tab controllers. Each navigation controller has a simple UIViewController as its root view controller (I've added UIImageViews to the placeholders to make it easy to remember what it links to). Each of them is a subclass of TVStoryboardViewController. Each has a Restoration ID set to the storyboard they should link to.
Some wins here:
It seems to work best for modal presentations where the subclass is the root view controller of a navigation controller.
The subclass doesn't push any controllers on the stack - it swaps. This means you don't have to manually hide a back button or override tab behaviour elsewhere.
If you double tap on a tab, it will take you to the Storyboard's initial view, as expected (you won't see that placeholder again).
Super simple to set up - no custom segues or setting multiple subclasses.
You can add UIImageViews and whatever you like to the placeholder view controllers to make your Storyboards clearer - they will never be shown.
Some limitations:
This subclass needs to belong to a UINavigationController somewhere in the chain.
This subclass will only instantiate the initial view controller in the Storyboard. If you want to instantiate a view controller further down the chain, you can always split your Storyboards further and reapply this subclass trick.
This approach doesn't work well when pushing view controllers.
This approach doesn't work well when used as an embedded view controller.
Message passing via segues likely won't work. This approach suits setups where sections of interface are unique, unrelated sections (presented modally or via tab bar).
This approach was hacked up to solve this UITabBarController problem, so use it as a partial solution to a bigger issue. I hope Apple improves on 'multiple storyboard' support. For the UITabBarController setup however, it should work a treat.
This is a bit late for Hawke_Pilot but it might help others.
From iOS 9.0 onwards you can create a Relationship Segue to another storyboard. This means that Tab Bar View Controllers can link to View Controllers on another storyboard without some of the mind-bending tricks seen in other answers here. :-)
However, this alone doesn't help because the recipient in the other storyboard doesn't know it's being linked to a Tab Bar View Controller and won't display the Tab Bar for editing. All you need to do once you point the Storyboard Reference to the required View Controller is select the Storyboard Reference and choose Editor->Embed In->Navigation Controller. This means that the Nav Controller knows it's linked to a Tab Bar View Controller because it's on the same storyboard and will display the Tab Bar at the bottom and allow editing of the button image and title. No code required.
Admittedly, this may not suit everyone but may work for the OP.
Not sure if your question is answered, and for others looking for a solution to this problem, try this method.
Create the Tab Bar Controller with Navigation Controllers in one storyboard file. And add an empty view controller (I named it RedirectViewController) as shown in the picture.
The child view controller (let's call it SettingsViewController for your case) is located in Settings_iPhone.storyboard.
In RedirectViewController.m, code this:
- (void)viewWillAppear:(BOOL)animated
{
UIStoryboard *settingsStoryboard = [UIStoryboard storyboardWithName:#"Settings_iPhone" bundle:nil];
UIViewController *rootSettingsView = [settingsStoryboard instantiateInitialViewController];
[self.navigationController pushViewController:rootSettingsView animated:NO completion:nil];
}
SettingsViewController will be pushed into view instantly when Settings tab is touched.
The solution is not complete yet! You will see "< Back" as the left navigationItem on SettingsViewController. Use the following line in its viewDidLoad method:
self.navigationItem.hidesBackButton = YES;
Also, to prevent the same tab bar item from being tap and causes a jump back to the blank rootViewController, the destination view controllers will need to implement UITabBarControllerDelegate
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
return viewController != tabBarController.selectedViewController;
}
It works for me.
Add Following code to your LinkViewController
-(void) awakeFromNib{
[super awakeFromNib];
///…your custom code here ..
UIStoryboard * storyboard = [UIStoryboard storyboardWithName:self.storyBoardName bundle:nil];
UIViewController * scene = nil;
// Creates the linked scene.
if ([self.sceneIdentifier length] == 0)
scene = [storyboard instantiateInitialViewController];
else
scene = [storyboard instantiateViewControllerWithIdentifier:self.sceneIdentifier];
if (self.tabBarController)
scene.tabBarItem = self.tabBarItem;
}
Here is the screenShot for LinkViewController .
LinkViewController is just a placeholder where new viewController would be placed. Here is the sample code which I used for my app.
RBStoryboardLink . Its working great for me. Let me know if it is helpful for you.

I have view controllers in a navigation controller hierarchy, but only want the navigation bar on the first view controller - how do I do this?

I have a main view controller that lists a bunch of items, and when they tap on one of the items it segues them to the next view. However, in the next view, I don't want the navigation bar to be there, I only want it in the first view (I'm using a UIToolBar for the navigation bar, kind of like in iBooks).
How exactly do I go about achieving this? If I remove the main view controller from the navigation controller completely (unembedding, effectively) I can implement the nav bars selectively, but this solution doesn't allow segues, so it's no good.
My other solution was to call self.navigationController.navigationBarHidden = YES; in viewDidAppear for the second view, but with this, the UIToolBar that I added in my storyboard is pushed under the navigation bar that hasn't been hidden yet, and then when it does get hidden, it disappears and the UIToolBar "falls down", which is a pretty gross effect to the user.
What would be the best way to go about getting this effect?
The best way to do that is the following. In you viewWillAppear: in the first (rootViewController) of your UINavigationController, you set:
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO animated:animated];
}
and then in you viewWillDisappear, you the the opposite:
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
This way should work without nothing 'ugly' happening to the user.

Something like prepareForSegue but for when going back

In my iOS app, I'm using a UINavigationController with segues setup in Xcode. For one of the views, I want to hide the navigation bar, and for the others, I want it to show up. I am able to successfully hide the bar in the main view, then nicely animate it in when I segue to the next view, but when I go back (using the back button in the navigation bar), the bar just disappears, leaving a black rectangle, then switches back to the previous view. I would like to be able to catch this, with something like the opposite of prepareForSegue, and nicely animate the navigation bar out. Is there some way to do this?
There currently is no prepareForDesegue:sender: alternative to prepareForSegue:sender:. The recommended practice is to establish a reference, in the destination ViewController, back to the source ViewController. Then, when the destination ViewController is dismissed, it can notify the source ViewController that it is about to become the top ViewController again.
Typically, the reference is established in prepareForSegue:sender:.
So, to make this concrete, let's suppose that you have ViewControllerA, and are about to segue to ViewControllerB. In ViewControllerB, you would define a property that references ViewControllerA. (This is often done using protocols, but to make it simple, just assume that ViewControllerB has #property ViewControllerA *delegate;.)
Then, in prepareForSegue:sender:, you would do the following:
ViewControllerB * vcB = (ViewControllerB *)[segue destinationViewController];
vcB.delegate = self;
Later, in ViewControllerB, in whatever code is about to get you back to ViewControllerA, you would use self.delegate to reach back to ViewControllerA, and let it know it's about to be presented, and give it the opportunity to do whatever you need to with the UINavigationBar.
In the view's UIViewController that you want the navigation bar to appear, place the following methods:
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO animated:animated];
}
You can add some logic in case you want the bar to stick around for any reason (like certain next views still need the bar).

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