If I have a navigationController which is init with a root view controller MyViewController's instance.
And in that MyViewController's code
I can use
AnotherViewController *vc = [[AnotherViewController alloc] init];
[self presentModalViewController:vc animated:YES];
or
AnotherViewController *vc = [[AnotherViewController alloc] init];
[self.navigationController presentModalViewController:vc animated:YES];
I found these two works the same. Both present the modal view correctly.And I have found that the presented AnotherViewController's "parentViewController" property are all set to the navigation controller.
Why would this happen?the presentModalViewController automatically detect that the self is the subview of the navigation controller and re send the message to navigation controller?
Because MyViewController is the root view controller of the UINavigationController, it gets the convenience method of presentModalViewController: animated: by default. So when you say self.navigationController, it is referring to the same navigationController that presentModalViewController gives you. I think Apple is just trying to make it more intuitive to use the convenience method.
Related
I have a view controller like in the image below:
And I am trying to present this view controller from another view controller like so:
LHPDFFile *vc = [[LHPDFFile alloc] init];
vc.previewItemURL = self->_previewItemURL;
UINavigationController *navBar=[[UINavigationController alloc]initWithRootViewController:vc];
[self presentViewController:navBar animated:YES completion:nil];
This works, however my buttons are not appearing :(
It appears that the code above is creating a Navigation Controller instead of using mine with the buttons. What am I doing wrong?
Try instantiating your view controller with the storyboard. Something like:
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"YourStoryboardName" bundle:nil];
LHPDFFile *vc = (LHPDFFile *)[storyboard instantiateViewControllerWithIdentifier:#"<id of your view controller in the storyboard>"];
Calling the empty init method leads to empty instantiation of the view, because you have never mentioned that it should use this storyboard's this view controller. More details here.
You init none of your controllers from storyboard! Those buttons belongs to file view controller. You should init that controller from storyboard instead of call init.
MyViewController *vc = [[self storyboard] instantiateViewControllerWithIdentifier: #"MyViewControllerStoryBoardID"];
UINavigationController *navBar = [[UINavigationController alloc]initWithRootViewController:vc];
[self presentViewController:navBar animated:YES completion:nil];
I am presenting my view controller like this -
[self.navigationController presentViewController:self.thingContainerViewController animated:YES completion:nil]; //self.navigationController not nil here
This shows a UITableView. I want to push a VC on the navigation stack from here. But the self.navigationController is nil at this point. Any idea how to make this work?
[self.navigationController pushViewController:otherContainer animated:YES]; //self.navigationController is nil at this point
You need to wrap the view controller you are presenting in a navigation controller in order to be able to use the push and pop methods.
So for the first step:
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:self.thingContainerViewController];
Then:
[self.navigationController presentViewController:navigationController animated:YES completion:nil];
If you do that, your code will work.
Swift 3/Swift 4
first of all you need to set navigation controller on which you want to present.After that do navigation process on your second view controller.
Example like that
let firstPresentVC = FirstVC(nibName:"FirstVC",bundle:nil)
let navVC = UINavigationController(rootViewController:firstPresentVC)
navVC.isNavigationBarHidden = true
self.present(navVC, animated: true, completion:nil)
Now You are on Present Stack With Navigation
You can push after that
let secondPushVC = secondPushVC(nibName:"secondPushVC",bundle:nil)
self.navigationController?.pushViewController(secondPushVC, animated: true)
UIViewController.navigationController means:
The nearest ancestor in the view controller hierarchy that is a navigation controller.
on the other hand, presentViewController makes new view controller out of hierarchy, the new view controller has no navigation controller ancestor unless you assign one to it by [[UINavigationController alloc] initWithRootViewController:self.thingContainerViewController] as #Dima mensioned.
so, the solution is
UINavigationController *targetVCWithNavigationControllerAncestor = [[UINavigationController alloc] initWithRootViewController:self.thingContainerViewController];
[self.navigationController presentViewController:targetVCWithNavigationControllerAncestor animated:YES completion:nil];
then you can push new view controller from self.thingContainerViewController
I'm new to Objective-C and I want to add a UINavigationBar on my CatrgoryBIDViewController. I have proceed UIButton in InstructionBIDViewController.m file that should navigate to CatrgoryBIDViewController. Here is the function code:
- (IBAction)proceed:(id)sender {
viewControllercat =
[[CatrgoryBIDViewController alloc]
initWithNibName:#"CatrgoryBIDViewController"
bundle:nil];
UINavigationController *nav =
[[UINavigationController alloc]
initWithRootViewController:self.viewControllercat];
//[self.navigationController pushViewController:viewControllercat animated:YES];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
But it is not setting the UINavigationBar.
You should read the documentation here to understand the way a NavigationController is working. For your case:
If your current ViewController (where your proceed-method is implemented) has a NavigationController (is child of it), you can push another ViewController onto the stack of that NavigationController with
[self.navigationController pushViewController:viewControllercat animated:YES];
In this case you do not need to initialize another NavigationController, but in your CatrgoryBIDViewController in viewWillAppear you need to make the NavigationBar visible if it was not before already with
[self.navigationController setNavigationBarHidden:NO animated:YES];
If your current ViewController does not have a NavigationController, you can not push another ViewController on top of it and can not show the NavigationBar of it (although you can create your own NavigationBar and add it to the View of the ViewController, but without the usual Navigation-behaviour embedded).
If you open your ViewController programmatically (e. g. from the AppDelegate) you are correct to do so by your call:
viewControllercat = [[CatrgoryBIDViewController alloc] initWithNibName:#"CatrgoryBIDViewController" bundle:nil];
UINavigationController *nav=[[UINavigationController alloc] initWithRootViewController:self.viewControllercat];
My apologies - After having reread your question, I am going to tweak my answer some.
-(IBAction)proceed:(id)sender
{
viewControllercat = [[CatrgoryBIDViewController alloc] init];
UINavigationController * nc =
[[UINavigationController alloc] initWithRootViewController:vc];
// We now need to display your detail view but cannot push it.
// So display modally
[self presentViewController:nc animated:YES completion:Nil];
}
The above should result in your DetailViewController - CategoryBIDViewController being displayed on top of your InstructionBIDViewController and it should have a UINavigationController in it.
I have simple application with only one main view, which has 'Settings' button, and settings are tree-grouped, so I wand to present them in navigation controller. And I don't want navigationController in main view, because I don't want navigation bar there.
That's why I don't instantiate navigationController in application: didFinishLaunchingWithOptions:. And when I check self.navigationController in 'Settings' button handler, it returns nil.
So I wrote this: (I use ARC)
- (void)doSettings
{
NSLog(#"%#", self.navigationController); // prints nothing
SettingsViewController *settingsViewController = [SettingsViewController alloc] initWithStyle:UITableViewStyleGrouped];
UINavigationController *navigationController = [[UINavigationController alloc] init];
[self.view.window setRootViewController:navigationController];
[navigationController pushViewController:settingsViewController animated:YES];
}
This works, although it pushes settingsViewController without animation (don't know why).
Is this generally the correct way to do - to change rootViewController in the middle of running app?
And if yes - than when I'm done with Settings, I probably need to set rootViewController back to current viewController, as it was before I tapped 'Settings'?
I think you want to create a navigation controller that you will present modally; the following will do:
SettingsViewController* settingsViewController = [[SettingsViewController alloc] initWithStyle:UITableViewStyleGrouped];
UINavigationController *navigationController = [[UINavigationController alloc] init];
[navigationController pushViewController:settingsViewController animated:YES];
[self presentViewController: navigationController animated: YES completion:nil];
where self here is the view controller you want to trigger the modal view controller from.
since you present modally the navigation controller you can dismiss it within the code source of your settingsViewController by accessing its navigation controller:
[self.navigationController dismissViewControllerAnimated:YES completion: nil];
To answer your question setting the rootViewController is not the correct way. Present the new vc modally through the presentViewController method.
A better way is to build the navigation vc and present it over your main vc (not replace your main vc).
- (void)doSettings
{
NSLog(#"%#", self.navigationController); // prints nothing
SettingsViewController *settingsViewController = [SettingsViewController alloc] initWithStyle:UITableViewStyleGrouped];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController: settingsViewController];
[self presentViewController: navigationController animated:YES completion:^{}];
}
Your main vc might realize (maybe as a delegate) that the settings flow is complete. It can then dismiss the presented navigation controller with:
- (void)dismissViewControllerAnimated:(BOOL)flag completion:(void (^)(void))completion
Alternatively, the setting flow could dismiss itself...
// somewhere in the settings vc or a vc it pushes, when we decide settings are done
self.navigationController dismissViewControllerAnimated:YES completion:^{}];
Have navigation in main view and have below line (which will hide navigation bar)
[[self navigationController] setNavigationBarHidden:YES animated:YES];
(I would say have this in viewWillAppear and viewDidLoad both, BUT in viewWillAppear is MUST).
Now in second view, to show navigation bar
[[self navigationController] setNavigationBarHidden:NO animated:YES];
Hope this will solve your problem...
In my app i present a UINavigationController modally with a UIViewController as its rootViewController. I do it in form style. I added a second UIViewController which is also in form style and i can push to it fine. However when i perform a popViewController action after the second UIViewcontroller gets popped onto the first, the whole modally presented UIViewController gets dismissed. However i don't perform any dismissing and the dismissing function doesn't get triggered by accident either.
Any ideas why it's happening?
Sincerely,
Zoli
EDIT:
That's how i'm presenting the modal viewcontrollers with a navcontroller:
if(!welcomeScreenAlreadyPresented) {
welcomeScreenViewController = [[WAWelcomeViewController alloc]init];
}
welcomeScreenNavController = [[UINavigationController alloc]initWithRootViewController:welcomeScreenViewController];
[welcomeScreenNavController setModalTransitionStyle: UIModalTransitionStyleCrossDissolve];
[welcomeScreenNavController setModalPresentationStyle:UIModalPresentationFormSheet];
[welcomeScreenNavController setNavigationBarHidden:YES animated:NO];
[self.navigationController presentViewController:welcomeScreenNavController animated:YES completion:nil];
That's how i'm navigation in WAWelcomeViewController.m
registerViewController = [[WARegisterViewController alloc]init];
[self.navigationController pushViewController:registerViewController animated:YES];
And in WARegisterViewController.m that's how i pop back
[self.navigationController popViewControllerAnimated:YES];
What you need to do is put the viewController you want to push inside another UINavigationController.
registerViewController = [[WARegisterViewController alloc]init];
UINavigationController *modalNavigationController = [[UINavigationController alloc] initWithRootViewController:registerViewController]; // autorelease if you are not using ARC
[self presentViewController:navController animated:YES completion:^{}];
You might want to add the modalNavigationController as a property to later call popViewControllerAnimated: on it.