There are five controllers here, AViewController, BViewController, CViewController,DViewController,EViewController,controllers here,
A present---> B
B present---> C
C push--->D
D push--->E
Now, if I want to go back from EViewController to AViewController in one step, what code should I write?
[self.navigationController popToRootViewControllerAnimated:animated];
1) Getting the desirable ViewController as Below
for (id controller in [self.navigationController viewControllers])
{
if ([controller isKindOfClass:[AViewController class]])
{
[self.navigationController popToViewController:controller animated:YES];
break;
}
}
2) Here you have A,B,C,D,E Controllers. means A would be on 1 Position so what can you do
you can hard wired the Index as Below
[self.navigationController popToViewController:[[self.navigationController viewControllers] objectAtIndex:0] animated:YES];
3) Pop to the first viewController or rootViewController
[self.navigationController popToRootViewControllerAnimated:animated];
Use unwind segues.
In AViewController add bellow code
-(IBAction)prepareForUnwind:(UIStoryboardSegue *)segue {
}
Go to User Interface of EViewController and Ctrl-drag from the button (you want set action) to the “Exit” outlet, you will see a modal popup.
You can do it recursively with generic solution. First of all you should have reference to A's navigation controller and then you should write recursive method to get active navigation controller like :`
-(UINavigationController*)getActiveNavigationController : (UINavigationController*)navigationController {
if ([navigationController.presentedViewController isKindOfClass:[AViewController class]]) {
return [self getActiveNavigationController:(UINavigationController*)((AViewController*)navigationController.presentedViewController)
];
}
if ((UINavigationController*)navigationController.presentedViewController == nil) {
return navigationController;
}
return [self getActiveNavigationController:(UINavigationController*)navigationController.presentedViewController];
}
`
After that you should write method like
-(void)getInitialScreen:(UINavigationController*)AViewControllerNavigationController {
if ([AViewControllerNavigationController.presentedViewController isKindOfClass:[AViewController class]]) {
return;
}
UINavigationController *navigation = [self getActiveNavigationController:AViewControllerNavigationController];
[navigation dismissViewControllerAnimated:YES completion:^{
[self getInitialScreen:AViewControllerNavigationController];
}];
}
finally after you wrote those 2 methods. You can call them like below and you can always get AViewController
[self getInitialScreen:AViewControlelrnavigationcontroller];
[AViewControlelrnavigationcontroller popToRootViewControllerAnimated:YES];
Related
I have three Viewcontrollers : ViewControllerA, ViewControllerB and ViewControllerC.
When I am in ViewControllerC, I click on Navigation Back button to go back to ViewControllerA directly, skipping ViewControllerB.
I have tried following approaches, both of them work. But, I wonder while transiting from ViewController C to ViewController A, it shows ViewController B in one second for during the transition.
Is there a way just directly navigate from ViewController C to ViewController A skipping ViewControllerB.
Approach 1:
-(void) viewWillDisappear:(BOOL)animated {
if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
NSLog(#"back button pressed");
[self.navigationController popViewControllerAnimated:YES];
}
[super viewWillDisappear:animated];
}
Approach 2:
-(void) viewWillDisappear:(BOOL)animated {
if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
NSLog(#"back button pressed");
//[self.navigationController popViewControllerAnimated:YES];
NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];
for (UIViewController *aViewController in allViewControllers) {
if ([aViewController isKindOfClass:[ViewControllerA class]]) {
[self.navigationController popToViewController:aViewController animated:NO];
}
}
}
[super viewWillDisappear:animated];
}
You need to use setViewControllers method, and pass only the viewControllerA that is the first element in your navigationController.viewControllers array
Code
- (IBAction)backAction:(id)sender {
UIViewController * viewControllerA = [self.navigationController.viewControllers firstObject]; //we get the first viewController here
[self.navigationController setViewControllers:#[viewControllerA] animated:YES];
}
similar answer here How to start from a non-initial NavigationController scene but in swift
Try popToRootViewControllerAnimated . It will move to First ViewController which NavigationController embed.
[self.navigationController popToRootViewControllerAnimated:YES];
NSArray *arrayViewControllers = [self.navigationController viewControllers];
for (UIViewController *viewcontroller in arrayViewControllers) {
if ([viewcontroller isKindOfClass:[ViewControllerA class]]) {
[self.navigationController popToViewController:viewcontroller animated:true];
}
}
I have the following code to push new ViewControllers.
- (IBAction)btnEditPressed:(id)sender {
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *controller = [storyboard instantiateViewControllerWithIdentifier:#"contactListViewController"];
[self parentShowViewController:controller sender:sender];
}
- (void)parentShowViewController:(UIViewController *)controller sender:(id)sender {
if ([self isIOS7]) {
// En iOS7 no existe el método showViewController
[self.navigationController pushViewController:controller animated:YES];
} else {
//[self.navigationController pushViewController:controller animated:YES];
[super showViewController:controller sender:sender];
}
}
Now I have the following scenario: I have 3 ViewControllers called A,B,C.
A->B->C If press back button I want to back from C to A
Try something like this
If you want go to Controller A from controller C on Controller C create custom back button and set the action of it, and put the following code.
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];
This is only work if you know that Controller A is your first Controller in Navigation.
If you don't know the order of viewController try this one
for (UIViewController *vc in self.navigationController.viewControllers) {
if ([vc isKindOfClass:[ViewControllerA class]]) {
[self.navigationController popToViewController:VC animated:Yes];
}
}
And to add a custom button go to this link
Hope this will help you.
I have a navigation controller A on which i push the view controller B. From B i present modally the view controller C. I need to dismiss C and pop B at the same time. I would like to that in sequence, keeping the dismiss animation first and then the pop animation from B to A. I tried without success this code:
[self dismissViewControllerAnimated:YES completion:^{
[self.presentingViewController.navigationController popViewControllerAnimated:YES];
}];
Any suggestion on how can i achieve this?
If you are writing in C viewcontoller then :
UIViewController *pvc = self.presentingViewController;
UINavigationController *navController = [pvc isKindOfClass:[UINavigationController class]] ? (UINavigationController *)pvc : pvc.navigationController;
[self dismissViewControllerAnimated:YES completion:^{
[navController popViewControllerAnimated:YES];
}];
or if in B view controller
[self.presentedViewController dismissViewControllerAnimated:YES completion:^{
[self.navigationController popViewControllerAnimated:YES];
}];
I had tried popping two times in succession before but not dismissing one and popping another one. You can try what I did and see if it works for you.
In Subview B:
- (void)subViewCController:(SubViewCController *)controller didSelectID:(NSNumber *)theID
{
// do something with theID...
// for my case, I popped
// [self.navigationController popViewControllerAnimated:YES];
// for your case
[self dismissViewControllerAnimated:YES completion:nil];
// Somehow, adding a small delay works for me and the animation is just nice
[self performSelector:#selector(backToSubViewA) withObject:nil afterDelay:0.6];
}
- (void)backToSubViewA
{
[self.navigationController popViewControllerAnimated:YES];
}
Are you using storyboards and segues? If so, you can use unwind segue:
In your first view controller (the one you want to jump back to, not the one you're returning from), create an unwind segue action:
- (IBAction)gotoMainMenu:(UIStoryboardSegue *)segue
{
// if you need to do anything when you return to the main menu, do it here
}
Then in storyboard, you can create a segue from the "dismiss" button to the exit outlet icon () in the bar above the scene, and you'll see main menu listed there.
I have a NavigationController with different ViewControllers. Sometimes I want to push a ViewController to NavigationController, which is already included.
In this case I want to move to the existing from TopController, and pop all other ViewControllers between top and the existing one.
Is there a way to give a ViewController a special id (for example a NSString), to find him later in "NavigationController.viewControllers"?
Or should I use a seperate Dictionary to manage my ViewControllers?
Or is there a better way, I dont consider.
best regards
On your appDelegate, you can store all your ViewController and when you want to pop call :
[self.navigationController popToViewController:yourViewController animated:YES];
Or you can try to search
NSArray *viewControllers = self.navigationController.viewControllers
for (UIVIewController *anVC in viewControllers) {
if (anVC isKindOfClass:[yourController class] {
[self.navigationController popToViewController:anVC animated:YES];
break;
}
}
Hope it will help you.
Note : As the view controllers are the same class, most times
Add strUniqueID property on each controller while pushing view controller to navigation controller don't forget to set it
Now you know which unique ID's you want remove, so find it
//Firstly find your viewController
for(id viewcontroller in self.navigationController.viewControllers)
{
//For finding specific viewController use isKindOfClass
if(viewcontroller isKindOfClass:[YourViewControllerNameHere Class])
{
//Now find UniqueIDHere
YourViewController *objYourViewController = (YourViewController *)viewcontroller
if(YourViewControllerNameHere.strUniqueID isEqualToString:removeUniqueIDHere])
{
//Now pop to YourViewController
[self.navigationController popToViewController:viewcontroller animated:YES];
break;
}
}
else if(viewcontroller isKindOfClass:[YourDifferentViewControllerNameHere Class]) //Different ViewControllers here like this
{
//Now find UniqueIDHere
YourDifferentViewController *objYourDifferentViewController = (YourViewController *)viewcontroller
if(YourDifferentViewController.strUniqueID isEqualToString:removeUniqueIDHere])
{
//Now pop to YourViewController
[self.navigationController popToViewController:viewcontroller animated:YES];
break;
}
}
}
Try this :
//Firstly find your viewController
for(id viewcontroller in self.navigationController.viewControllers)
{
//For finding specific viewController use isKindOfClass
if(viewcontroller isKindOfClass:[YourViewControllerNameHere Class])
{
//Now pop to YourViewController
[self.navigationController popToViewController:viewcontroller animated:YES];
break;
}
}
Swift 5
let vc = navVC.viewControllers.first(where: { $0.hasKey })
I do it with code:
NSArray *viewControllersFromStack = [self.navigationController viewControllers];
NSMutableArray *viewControllersFromStackMutable = [NSMutableArray arrayWithArray:viewControllersFromStack];
NSMutableArray *viewControllersToRemove = [[NSMutableArray alloc]init];
for (UIViewController *currentVC in viewControllersFromStack)
{
if ([currentVC isKindOfClass:[TalksViewController class]])
{
[viewControllersToRemove addObject:currentVC];
if (viewControllersToRemove.count == 2)
{
UIViewController *oneVCtoRemove = [viewControllersToRemove objectAtIndex:0];
[viewControllersFromStackMutable removeObject:oneVCtoRemove];
[self.navigationController setViewControllers:viewControllersFromStackMutable];
}
}
}
Problem is that I have reference to removed VC's in navigation Item. How to fix it?
When you want to remove a view from the navigation stack you can simply just call this method on the navigation bar to pop the view from the stack:
[self.navigationController popViewControllerAnimated:YES];
To pop an external view use
for(UIViewController *currentVC in viewControllersFromStack)
{
if([currentVC isKindOfClass:[TalksViewController class]])
{
[currentVC.navigationController popViewControllerAnimated:YES];
}
}
The above answer is correct.
I have 'A' as rootview controller. 'B to F' are other view controllers. From 'F', if I wanted to go directly to 'A', it is as under.
[self.navigationController popToRootViewControllerAnimated:YES];
BUT if I wanted to jump to 'B' then the code in answer is helpful. I only changed the array of view controllers to run reverse with 'reverseObjectEnumerator' and Animated to NO with 'popViewControllerAnimated:NO'. the Code is as under
NSArray *viewControllersFromStack = [self.navigationController viewControllers];
for(UIViewController *currentVC in [viewControllersFromStack reverseObjectEnumerator])
{
if(![currentVC isKindOfClass:[A class]] && ![currentVC isKindOfClass:[B class]])
{
[currentVC.navigationController popViewControllerAnimated:NO];
}
}