I have a UIViewController that is not on the navigation stack. It initialises another UIViewController which is on the top of the stack. The new root controller pushes more controllers on the stack and so on.
Now, I will need to pop all controllers down back to the controller which started the process. However, popToRootViewControllerAnimated doesn't work.
ie: A -> B -> C -> D where B, C and D are on the navigation stack and I need to go back to controller A from D. How to do it?
-(void) loadScreenWithNavigation:(UIViewController *)controller
{
_navController = [[UINavigationController alloc] initWithRootViewController:(_loadedController = controller)];
_navController.navigationBar.barStyle = UIBarStyleBlack;
_navController.navigationBar.translucent = NO;
[self.view addSubview:[_navController view]];
[self.view bringSubviewToFront:[_navController view]];
}
That's how I started the navigation stack in my "home" controller. I need to come back to the home controller.
Use standard UINavigationController's method:
[self.navigationController popToRootViewControllerAnimated:YES];
Then, you can removeFromSuperview your custom initialized view.
In AppDelegate,
UINavigationController *navController;
in AppDelegate.m file,
self.navController=[[UINavigationController alloc] initWithRootViewController:yourViewController];
[self.window addSubview:self.navController.view];
when you push yourViewcontrollerA to viewcontrollerB ,
[self.navigationController viewcontrollerB animated:YES];
same for viewControllerB to C and C to D ..
now if You want to go back D to C then,
[self.navigationController popToRootViewControllerAnimated:YES];
I suppose you want to remove this [_navController view] right?
which you can do as follows :
if([_navController.view superview])
[_navController.view removeFromSuperview];
EDIT:
In a simplified way, any UIViewController will disappear in the same fashion it appeared. If any view was added as
1.) addSubView method :
[self.view addSubView: myView];
it would be removed by
[myView removeFromSuperView];
2.) stack it to navigationController
[self.navigationController pushViewController:objctOfYourViewController animated:YES];
this view will pop out of stack as
[self.navigationController popViewControllerAnimated:YES];
3.) present modal view
[self presentModalViewController:objctOfYourViewController animated:NO];
which will be removed as
[self dismissModalViewControllerAnimated:YES];
Now, just in the way you added your views, you should make them remove.
Related
Im using Navigation Controller for my ViewControllers,I set my importantViewController as something like this to be its RootView:
UINavigationController *navControl = [[UINavigationController alloc] initWithRootViewController: vc];
[self presentModalViewController: navControl animated: YES];
Then, I pushView anotherView the FrontViewController like this:
[self.navigationController pushViewController:vc animated:YES];
After a button is pressed in FrontViewController another view will be pushed ViewA but it is connected with another ViewController ViewB the same way as this AGAIN:
[self.navigationController pushViewController:vc animated:YES];
(Which I think Im doing wrong when dismissing either of them with [self.navigationController popViewControllerAnimated:YES];)
This is an illustration:
My problem is, I need to navigate between View A and View B then when I dismiss either of them it will got back to FrontViewController. Like a child of a child View. Thanks.
I think this is for dismissModalViewController, but try this,
From View B write code like this
[[self parentViewController].navigationController popViewControllerAnimated:YES];
and From View A you can write,
[self.navigationController popViewControllerAnimated:YES];
Or either you can use this,
[self.navigationController popToViewController:frontViewController animated:YES];
UPDATE
for (UIViewController *tmpController in [self.navigationController viewControllers])
{
if ([tmpController isKindOfClass:[FrontViewController class]])
{
[self.navigationController popToViewController:tmpController animated:YES];
break;
}
}
This is the best solution to achieve this.
Write this code on both of your View A or B.
Hope it works now :-)
There is one way #Prasad G indicated. But problem with this solution is you need the same object of frontViewController. You can't do this with creating a new object. For going to this way declare frontViewController object in appdelgate and while pushing it from importantVC use
appdelgate.frontViewController = // initialize
// Push it
While going back from view B
[self.navigationController popToViewController:appdelegate.frontViewController animated:YES];
Another solution is
for (UIViewController *vc in [self.navigationController viewControllers]) {
if ([vc isKindOfClass:[FrontViewController class]]) {
[self.navigationController popToViewController:vc animated:YES];
break;
}
}
Using this way you can go on any of view controller from any level of navigation stack.
Using the first solution if you have 10 view Controllers and you want to go on any of one so you have to first create object of all 10 View Controller in appdelegate.
This code may have spell issues as I just typed this here
Hope this helps :)
UPDATE
->You have impVC as your root view
-> You pushed frontVC
-> From there you Pushed VC_A
-> From there you want to push VC_B
so you are done with pushing and for coming back to VC_A you can use
[self.navigationController popViewControllerAnimated];
Now you can again come on VC_B and again pop it. For going to frontVC from VC_A you can use popViewControllerAnimated and for going to frontVC from VC_B you can use the for loop i mentioned.
Please explain if you are looking anything else. If you are still facing issue please explain.
[self.navigationController popToViewController:frontViewController animated:YES];
Try like this i think it will be helpful to you.
In FrontViewController After a button is pressed:
ViewA instance
[self.navigationController pushViewController:ViewA animated:YES]
When ViewA disissmed
[self.navigationController popViewControllerAnimated:YES];
Load ViewB in ViewA
ViewB instance
[self.navigationController pushViewController:ViewB animated:YES]
On back viewB to FrontViewController
FrontViewController instance
[self.navigationController popToViewController:FrontViewController animated:YES];
On back viewB to viewA
[self.navigationController popViewControllerAnimated:YES];
When I push cancel button in the third view, I want to go back to the first view directly.
I also want to remove the second view.
How can I do that?
This is the code.
// this part is in the first view.
self.second = [SecondController alloc] init];
[self.view addSubview:second.view];
// this part is in the second view.
ThirdController *thirdController = [[ThirdController alloc] initWithStyle:UITableViewStyleGrouped];
self.navigationController = [UINavigationController alloc] initWithRootViewController:thirdController];
[self.view addSubview:navigationController.view];
// this part is in the third view.
- (void)cancel {
[self.view removeFromSuperview]; // this only goes to the second view.
}
EDIT:
Can I use popToViewController in called contoller? My app crashes.
I thought popToViewController can be used only in calling controller.
And popToViewController is used when it was pushed.
I did add not push.
[self.navigationController popToViewController:[[self.navigationController viewControllers] objectAtIndex:0] animated:YES];
popToViewController:animated: is a UINavigationController method that you use when popping view controllers off the navigation controller stack. It doesn't fit for this scenario.
This user is adding subviews, not pushing them on a navigation controller stack.
As a note, it appears as a matter of design you should be using a navigation controller with the first view as the root controller, then the second pushed on the stack, and the third pushed on the stack. Then all you have to do is [self.navigationController popToRootViewControllerAnimated:YES].
I think this will work if you want to keep your current architecture:
// this part is in the third view.
- (void)cancel {
// remove the second view (self.view.superview) from the first view
[self.view.superview removeFromSuperView];
// can't recall, possibly you still need to remove the third view, but i think removing the superview will do it.
// [self.view removeFromSuperView];
}
If you prefer to try the UINavigationController route, then the easiest path is to create a new project in Xcode and select the type for a Navigation-Based Application or a Master-Detail Application. This will create a UINavigationController in a nib and add it to your window. You can then set the root view controller in Interface Builder to your FirstViewController class.
If you prefer to create the UINavigationController in code, then that is also possible. I show that below, along with the rest of the code you need, regardless of whether you create your UINavigationController in a nib in IB or in code.
I also recommend reading the View Controller Programming Guide for iOS.
In your app delegate or some other code:
-(void)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions [
// I would recommend setting up the UINavigationController and FirstViewController as IBOutlets in your nib, but it can be done in code.
FirstViewController* fvc = [[FirstViewController alloc] initWithNibName:#"FirstView" bundle:nil];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:fvc];
[window addSubView:navController.view];
[window makeKeyAndVisible];
[fvc release];
[navController release];
}
In the first view controller:
SecondViewController* svc = [[SecondViewController alloc] initWithNibName:#"SecondView" bundle:nil];
[self.navigationController pushViewController:svc animated:YES];
[svc release];
In the second view controller:
ThirdViewController* tvc = [[ThirdViewController alloc] initWithNibName:#"ThirdView" bundle:nil];
[self.navigationController pushViewController:tvc animated:YES];
[tvc release];
In the third view controller:
-(void)cancel {
// returns to the first view controller
[self.navigationController popToRootViewControllerAnimated:YES];
}
Use
- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated
to go back to a specific view controller.
Try this:
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];
This will pop to the view at index 1. Hope that Helps!
// this part is in the third view.
- (void)cancel {
self.first = [SecondController alloc] init];
[self.view addSubview:second.view];
}
And I think if you have you don't need to be worried about removing beneath view, later these will removed.
I'm extremly new to iphone and I have the following misunderstanding.
All over internet the tutorials about how to use NavigationController programatically it says:
NavigationController must be declared in applicationDidFinishLaunching and must be init with a root.After that you can add views to it.
I have this:
A UIViewController class meaning(AdiViewController.h, AdiViewController.m and AdiViewController.xib) and no Delegate file meaning no applicationDidFinishLaunching method.
What I wanna do is from my class-AdiViewController when pressing a button to go to another view.
I understand that I need a NavigationController which should retain my views having the root AdiViewController.
But my problem is where should I initializate that NavigationController in viewDidAppear??...cause I don't have the Delegate files.
If you could provide a minimal example with this small issue of mine it would be great.I'm sure that for those how are senior this is nothing but still I don't get it.Thanks
NavigationController must be declared in applicationDidFinishLaunching -> this is not true.
In your AdiViewController if you have button when you push that button you want to load navigation Controller right ?
// Hook this IBAction to your button in AdiViewController
- (IBAction)pushNavController
{
AnotherViewController* rootView = [[AnotherViewController alloc] initWithNibName:#"Anotherview" bundle:nil];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:rootView];
[rootView release];
[self presentModalViewController:navController animated:YES];
[navController release];
}
If you are in AnotherViewController i.e., you are in root view controller of Navigation controller. You need to push and pop view controllers from there. For example if you have a button in AnotherViewController:
// push next view controller onto navigation controller's stack
- (IBAction)pushNextViewController
{
NextViewController* nextView = [[NextViewController alloc] initWithNibName:#"NextView" bundle:nil];
[self.navigationController pushViewController:nextView animated:YES];
[nextView release];
}
// Similarly if you want to go back to AnotherViewController from NextViewController you just pop that from navigation controller's stack
- (IBAction)pushNextViewController
{
[self.navigationController popViewControllerAnimated:YES];
}
I have an App with one MainWindow.xib file. Then I have ViewControllerA.xib and ViewControllerB.xib. My MainWindow.xib have one ViewController that points two ViewControllerA.xib.
On ViewControllerA I have a button and I would like the button, when pressed, to move ViewControllerB onto the screen. How do I do that?
I tried this code, but I think I am missing something:
- (IBAction)btMyButton:(id)sender
{
ViewControllerB * viewController = [[ViewControllerB alloc] initWithNibName:#"ViewControllerB" bundle:nil];
[[UIApplication sharedApplication].keyWindow addSubview:viewController.view];
[self.navigationController pushViewController:viewController animated:YES];
}
My ViewControllerB does appear, but it is squashed at the top of the screen, over the previous view. Any help is greatly appreciated.
Thank you
Remove the second line:
[[UIApplication sharedApplication].keyWindow addSubview:viewController.view];
You are adding the view twice. The 2nd and 3rd lines both cause the view to be added to the view hierarchy in different places.
--update--
If you remove the 2nd line and are not seeing your view then self.navigationController is most likely nil. Try [self presentModalViewController:] instead.
Make sure that the view of controller B has correct hight you should subtract the navigation bar height 44 px and status bar 20 px as well. Those values are for iPhone.
- (IBAction)btMyButton:(id)sender
{
//you should load from the main app bundle
ViewControllerB * viewController = [[ViewControllerB alloc] initWithNibName:#"ViewControllerB" bundle:[NSBundle mainBundle]];
// you don't need the following line
//[[UIApplication sharedApplication].keyWindow addSubview:viewController.view];
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
}
Update
As the above comment says if you may don't have a navigation controller to push Controller B into. So Add a navigation controller into the main window instead of the view controller and make its root view controller you Controller A.
I hope this helps you,
you will need to remove old viewcontroller from main windows.
- (IBAction)btMyButton:(id)sender
{
//Assuming you declare two Iboutlet controllerA, controllerB mapping with that view as class variable
{
if (self.controllerB == nil)
{
ViewControllerB * viewController = [[ViewControllerB alloc] initWithNibName:#"ViewControllerB" bundle:nil];
self.controllerB = viewController;
[viewController release];
}
[controllerA.view removeFromSuperview];
[self.view insertSubview:controllerB.view atIndex:0];
}
}
I am fairly new to iPhone. I have a peculiar problem. I am adding a view controller as a subView to the current view. And then I want to push a new view controller from it. The problem is when I try to do pushViewController, it is not responding.
For example, in CurrentViewController I have added NewViewController's view as subView
[self.view addSubView : NewViewController.view]
Now From NewViewController, on the click of a button I am doing the following :
SecondViewController *secondVC = [SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
[self.navigationController pushViewController:secondVC animated:YES];
Here the secondVC doesn't get pushed to the stack.
If you have used view based application, You have to use this code.
SecondViewController *secondVC = [SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
// [self.navigationController pushViewController:secondVC animated:YES];
[self presentModalViewController:secondVC animated:YES];
If you want to use navigation controller in your appln. First you have to add navigation controller in your appln and then only will navigate the view.
Perhaps the problem is that method is called pushViewController not pushToViewController. Try
SecondViewController *secondVC = [SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
[self.navigationController pushViewController:secondVC animated:YES];
// don't forget release here
[secondVC release];