i am new to IOS .
My question is, i have some view-controllers as NavigationController,mainVC, VC1, VC2, VC3, CameraVC. In cameraVC i have a done button having action doneClicked. These all View-Controller are pushed in NavigationController. VC1 is presented, not pushed in nav-controller. doneClicked function implemented poptorootviewcontroller. when i click on done button it let me to VC1 but not the mainVC. Is there any way so i can pop all view controller to VC1 and after this automatically dismiss VC1 to mainVC.
Make your MainVC as root view controller and in the IBAction of done button use the code to pop to MainVC.
[self.navigationController popToRootViewControllerAnimated:YES];
Hope it helps.
To pop view controllers
[self.navigationController popToRootViewControllerAnimated:YES];
and to dismiss presented view controller
[self dismissViewControllerAnimated:NO completion:nil]
[self.navigationController setViewControllers:#[mainVC]];
I think this code will work on your situation. iOS Developer Library:
Replaces the view controllers currently managed by the navigation controller with the specified items.
- (void)setViewControllers:(NSArray *)viewControllers
animated:(BOOL)animated
source
you must do this after dissmiss present view controller. Use delegate
Now let's think your navigation stack is empty and your root is mainVC. you want to present VC1 that's ok just present it. But you should give a delegate to mainVC to what's gonna happen after dissmissing VC1. For example you present VC1 from mainVC. And you want to push VC2 after dissmiss VC1. That's ok just in mainVC has a delegate so in this method
[self.navigationController pushViewController:VC2];
Present views does not affect your navigation stack. It's not in your stack. so everytime you dismiss it from a controller you should give an delegate to that controller to what will happen after dissmissing.
Try it.
Hope it helps.
Related
I have a firstViewController that I display with
[self.navigationController pushViewController:firstViewController animated:true];
Then when a button in this first VC is clicked, I present a second one:
[self presentViewController:secondViewController animated:true completion:nil];
And from this second one I present the third VC as a modal:
[thirdVC modalPresentationStyle];
[thirdVC setModalPresentationStyle:UIModalPresentationOverCurrentContext];
[self presentViewController:thirdVC animated:true completion:nil];
The problem is that I want to display the firstVC when the validate button of the last VC is clicked. So I have to dismiss the third and the second one. I tried this in the validateAction (in the third VC):
[[self parentViewController] dismissViewControllerAnimated:true completion:nil];
[self dismissViewControllerAnimated:true completion:nil];
But the result is that the thirdVC (the modal one) is dismissed, and from the debugger I can see that the firstVC is covered by the secondVC.
How can I dismiss the second and the third VC at the same time in order to return to the first one?
NOTE: I want to push the firstVC after the dismiss of the others because I have to reload the data (in the fristVC viewDidLoad)
From Apple's Documentation:
The presenting view controller is responsible for dismissing the view controller it presented. If you call this method on the presented view controller itself, UIKit asks the presenting view controller to handle the dismissal.
In other words, the third viewController asks the second viewController to dismiss its presented viewController, which is the third one. Then the third viewController tries to dismiss itself, causing UIKit to ask the second viewController to dismiss the third one once more.
You will have to go one layer up and ask the first viewController to dismiss its presented view controller.
It is good practice that the third viewController does not know anything about the presentation hierarchy. You can use delegation to tell the first viewController that the task is finished. An exit segue is a very nice alternative if you use storyboards.
You only have to call -dismissViewControllerAnimated:completion: once if you address the first viewController:
If you present several view controllers in succession, thus building a stack of presented view controllers, calling this method on a view controller lower in the stack dismisses its immediate child view controller and all view controllers above that child on the stack.
I have the following structure:
UINavigationController(1) -> MainViewController ---PRESENT MODAL--->
UINavigationController(2) -> TutorialViewController ---PRESENT MODAL---> LoginViewController
---PRESENT MODAL---> SignupViewController
I want to dismiss the UINavigationController(2) from a user action on LoginViewController.
Any idea?
You should use delegation to dismiss the second view controller. So you would have the second nav controller be dismissed by the first nav controller, the one that presented it. This is the recommended way to dismiss modal views.
Here are the docs on delegation
WLINewPostViewController *newPostViewController = [[WLINewPostViewController alloc] initWithNibName:#"WLINewPostViewController" bundle:nil];
UINavigationController *newPostNavigationController = [[UINavigationController alloc] initWithRootViewController:newPostViewController];
newPostNavigationController.navigationBar.translucent = NO;
[tabBarController presentViewController:newPostNavigationController animated:YES completion:nil];
So I just simply push a new UIViewController.
Then after it posts the server callback calls a method with this code from the WLINewPostViewController.m:
[self dismissViewControllerAnimated:YES completion:^{
NSLog(#"Completed");
}];
[[self navigationController] popViewControllerAnimated:YES];
if (self == self.navigationController.visibleViewController){
NSLog(#"self = visibile");
}
if (self == self.presentingViewController.presentingViewController){
NSLog(#"self = presenting");
}
}
I tried a bunch of different things and none work.
I am relatively new to Xcode but after trying
[self dismissViewControllerAnimated:YES completion]
[self.navigationController popViewControllerAnimated:YES]
[self.navigationController.visibleViewController.presentedViewController dismissViewControllerAnimated:YES completion:nil];
[self.navigationController dismissViewControllerAnimated:YES completion:nil];
and every other possibility, I am officially stumped. The WLINewPostViewController still won't dismiss.
It Logs out "self = visible"
Let me illustrate what you are trying to do
You have a navigation controller with Controller A.
Here you are trying to present another Controller B from Controller A.
Now when you get a callback from the server, you should call dismissViewControllerAnimated from Controller B to dismiss itself.
So after dismissViewControllerAnimated:completion: method call, the Controller B will be dismissed and Controller A will be shown automatically. Now you do not need to call popViewControllerAnimated: in completion block again as there is no other Controller in navigation controller to load.
If you have different use case, let me know I can provide solution.
You are presenting a view over navigationbar instead of pushing it over navigationbar.
When push you pop. When you present you dismiss. So instead of popViewControllerAnimated you need to use dismissViewControllerAnimated:completion
dismiss behaves differently depending on the receiver. From the docs:
The presenting view controller is responsible for dismissing the view controller it presented. If you call this method on the presented view controller itself, it automatically forwards the message to the presenting view controller.
If you present several view controllers in succession, thus building a stack of presented view controllers, calling this method on a view controller lower in the stack dismisses its immediate child view controller and all view controllers above that child on the stack. When this happens, only the top-most view is dismissed in an animated fashion; any intermediate view controllers are simply removed from the stack. The top-most view is dismissed using its modal transition style, which may differ from the styles used by other view controllers lower in the stack.
In short, if the vc on top calls it on itself, it dismisses itself. Anywhere else on the stack dismisses to that point, animating only the topmost vc.
What's extra confusing (for you and many others) is that the navigation vc has a stack too, and your problem is complicated further by presenting an navigation vc atop a tab-bar vc.
So what to do? The question is unclear about which vc is the receiver in the posted code (who is self in that snippet?). The text implies that self is a vc on the stack of the presented navigation vc, like...
TabBarVC --- presents ---> NavVC
| |
| --- viewControllers stack = rootVC, vc1
|
---> viewControllers for each tab
... and it's root or vc1 that wants to dismiss. If I'm right about that, then, given the docs, the solution is clear:
[self.navigationController dismissViewControllerAnimated:YES completion:^{}];
will put us back on the tabbar vc on whatever tab was visible when we did the present.
From Home view - my RootViewController - I open up 2 ViewControllers one after another as user progresses in navigation hierarchy like so:
1) SecondViewController is pushed by button connected in my Storyboard
2) ThirdViewController is presented modally
[self performSegueWithIdentifier:#"NextViewController" sender:nil];
So, the picture is: RootViewController -> SecondViewController -> ThirdViewController
Now in my ThirdViewController I want to have a button to go back 2 times to my RootViewController, i.e. go home. But this does not work:
[self.navigationController popToRootViewControllerAnimated:YES];
Only this guy goes back once to SecondViewController
[self.navigationController popViewControllerAnimated:YES];
How can I remove both modal and pushed view controllers at the same time?
I had a similar situation, where I had a number of view controllers pushed onto the navigation controller stack, and then the last view was presented modally. On the modal screen, I have a Cancel button that goes back to the root view controller.
In the modal view controller, I have an action that is triggered when the Cancel button is tapped:
- (IBAction)cancel:(id)sender
{
[self.delegate modalViewControllerDidCancel];
}
In the header of this modal view controller, I declare a protocol:
#protocol ModalViewControllerDelegate
- (void)modalViewControllerDidCancel;
#end
And then the last view controller in the navigation stack (the one that presented the modal view) should implement the ModalViewControllerDelegate protocol:
- (void)modalViewControllerDidCancel
{
[self dismissViewControllerAnimated:NO completion:nil];
[self.navigationController popToRootViewControllerAnimated:YES];
}
This method above is the important part. It gets the presenting view controller to dismiss the modal view, and then it pops back to the root view controller. Note that I pass NO to dismissViewControllerAnimated: and YES to popToRootViewControllerAnimated: to get a smoother animation from modal view to root view.
I had the same requirement but was using custom segues between the view controllers. I came across with the concept of "Unwind Segue" which I think came with iOS6. If you are targeting iOS6 and above these links might help:
What are Unwind segues for and how do you use them?
http://chrisrisner.com/Unwinding-with-iOS-and-Storyboards
Thanks.
Assuming your AppDelegate is called AppDelegate, then you can do the following which will reset the rootviewcontroller for the app window as the view RootViewController
AppDelegate *appDel = (AppDelegate*)[[UIApplication sharedApplication] delegate];
RootViewController *rootView = [[RootViewController alloc] init];
[appDel.window setRootViewController:rootView];
I have three view controllers. MainViewController, secondViewController, thirdViewController. I would like to know once I click on done button on the thirdViewcontroller,
How could I go directly yo MainViewController instead of going back secondViewController and then MainViewcontroller by using pushViewController?
Assuming that your using a navigation controller, you can pop to root by calling:
[[self navigationController] popToRootViewControllerAnimated:YES];
This will bring you back to your MainViewController.