I have an app with multiple tabs. On one tab my user can select a button which will lead them to another tab, but it will be a detail view controller there.
So I have on tab 1 a button where the user can go to the second tab.
On tab 2 I have a UINavigationController with a UIViewController set as rootViewController, where I need to land on a detail UIViewController.
I don't know how I can do this the right way.
I could create a static (or class) variable in the rootViewController of my second tab that will tell me if I need to push the detailViewController.
But I have multiple detail view controllers, which means that if I switch to the correct tab, I could go to a detail viewcontroller, which means that the static variable in that rootviewcontroller won't matter until I go back to that rootviewcontroller.
Any ideas on how I can improve my setup? (I am using separate storyboards for each tab, to reduce merge conflicts)
Call this method on your button click from tab1. This will add your DetailViewController in navigation stack of your second tab.
#pragma mark- Injecting middle view controller
-(void)showDetailViewControllerInjectingMiddleViewController {
// get navigation controller for your 2nd tab
UINavigationController *navigationController = [[((UITabBarController *)self.window.rootViewController) viewControllers] objectAtIndex:1]; // 1 is for second tab
NSMutableArray *controllers = [navigationController.viewControllers mutableCopy];
[controllers addObject: [self prepareMiddleViewController]];
[controllers addObject:[self prepareDestinationViewController]];
[navigationController setViewControllers:controllers animated:NO];
[self.tabBarController setSelectedIndex:1];
}
-(UIViewController *)prepareMiddleViewController {
UIViewController *rootViewController = [self.storyboard instantiateViewControllerWithIdentifier:rootViewIdentifier];
return rootViewController;
}
-(UIViewController *)prepareDestinationViewController {
UIViewController *detailViewController = [self.storyboard instantiateViewControllerWithIdentifier:detailViewIdentifier];
return detailViewController;
}
Related
I have Collection View Controller PatientList -> on selection of cell navigates to PatientdetailView -> on click of button navigates to startDignosisView. This is Navigation controller stack. Now from Patient List I have button "ADD" that navigates to AddpatientView, from where I have to navigate to StartdignosisView without disturbing Navigation stack. How can I do it?
for (UIViewController *controller in self.navigationController.viewControllers)
{
if ([controller isKindOfClass:[NeededViewController class]])
{
[self.navigationController popToViewController:controller
animated:YES];
break;
}
}
if let viewControllers = self.navigationController?.viewControllers {
var newStack: [UIViewController] = []
for viewController in viewControllers {
newStack.append(viewController)
if viewController is StartdignosisView {
break
}
}
self.navigationController?.viewControllers = newStack
}
try like this:
some *vc = [self.storyboard instantiateViewControllerWithIdentifier:#"some identifier you add to a vc in the storyboard"];
[self.navigationController pushViewController:vc animated:YES];
Just set the identifier to the storyboard for that view controller.
If you are not using storyboard then follow the below steps:
See if you Add Patient and then directly navigate to StartDignosisVC then you will not be able to pop to PatientDetailVC
You can do any one from these two:
First:
Try to present your AddPatientVC, add new and then dismiss it and follow your old stack path.
Second:
One ADD button action instantiate your AddpatientView like this:
AddPatientVC *obj = [storyboard instantiateViewControllerWithIdentifier:#"AddPatientVC"];
And similarly navigate to StartdignosisView with setting a flag that you are coming from AddPatientVC:
StartDignosisVC *obj = [storyboard instantiateViewControllerWithIdentifier:#"StartDignosisVC"];
obj.isFromAddPatientView = true
When you press Back button from StartDignosisVC then check if you came from AddPatientVC to directly pop it to Patient list.
If you are using storyboard then you can do the following see attached screen shot:
Thanks Mayank for your answer: following code worked in my case.
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];
I have an UITabBarController that has 3 buttons. The second button points to ViewController1 which is connected to another view called ViewController2. After I tap a button in ViewController2 I programmatically present ViewController1 again, that works perfect except one thing. After I "arrived" to ViewController1 the tab bar disappears.
I'm using this method to navigate back to ViewController1. (exactly I navigate to its navigation controller, but already tried with the view)
- (void)presentViewControllerAnimated:(BOOL)animated {
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"storyboard" bundle:nil];
UINavigationController *firstViewNavigationController = [storyboard instantiateViewControllerWithIdentifier:#"destination"];
[self presentViewController:firstViewNavigationController animated:animated completion:nil];
}
I call here the first method
- (void)didTapButton:(id)sender {
UIButton *button = (UIButton *)sender;
CGPoint pointInSuperview = [button.superview convertPoint:button.center toView:self.tableView];
[self presentViewControllerAnimated:YES];
}
This method hides the tab bar in the ViewController2, I already tried without it, therefore there is no problem with it.
-(BOOL)hidesBottomBarWhenPushed
{
return YES;
}
I can't figure out why this thing happens, I think it's a fair solution, that worked well for a several times when I needed to present views. I've read it can happen with segues, but I'm doing it with code without segues.
Actually your code works right. There should not be tab bar when you present FirstViewController from SecondViewController. Because when you call instantiateViewControllerWithIdentifier its basically creates a new instance of that view controller, and of course, there is no tab bar.
The right way to go back to your first view controller is to pop SecondViewController (or dismiss it, if it presented modally). So your final code should be like this
- (void)didTapButton:(id)sender {
// If this view controller (i.e. SecondViewController) was pushed, like in your case, then
[self.navigationController popViewControllerAnimated:YES];
// If this view controller was presented modally, then
// [self dismissViewControllerAnimated:YES completion:nil];
}
And of course, your view controller hierarchy in storyboard must be like this:
-- UINavigationController -> FirstViewController -> SecondViewController
|
->UITabBarController____|
-...
-...
I've tried the same and got the same result.
My solution was simple, on the push do this :
UINavigationController *firstViewNavigationController = [storyboard instantiateViewControllerWithIdentifier:#"destination"];
firstViewNavigationController.hidesBottomBarWhenPushed = true; // Insert this and set it to what you want to do
[self presentViewController:firstViewNavigationController animated:animated completion:nil];
and then remove your
-(BOOL)hidesBottomBarWhenPushed
{
return YES;
}
In android, switching between activities, is fairly straightforward
you call
Intent intent = new Intent(this,NextActivity.class); <- define the next activity
startActivity(intent); <- start the next activity
finish(); < -get rid of the current activity
now in iOS i know how to do this:
UIViewController *nextviewcontroller = [[UIViewController alloc]initWithNibName:#"nextvc" bundle:nil];
[self presentViewcontroller:nextviewcontroller animated:YES completion:nil];
How do I get rid of the current view controller? so that currentviewcontroller dies after presenting nextviewcontroller ?
[self dismissViewController:YES]; doesnt seem to do the trick
the lifecycle methods viewWillDisappear and viewDidDisappear are called even if I don't call [self dismissViewController:YES];
i want "currentviewcontroller" to be removed from the memory, and from the viewcontroller stack, so that clicking "back" in "nextviewcontroller" will go to some thirdviewcontroller that was before currentviewcontroller
In iOS is different, since there's no concept of Activity and everything is more focused on the app itself (in Android you can mix activities from different apps). Therefore, there's no concept of "view controller stack".
The most similar concept is the "navigation stack" of navigation controllers, where you actually push and pop new view controller into some kind of linear navigation. A navigation bar is automatically created and populated with back buttons.
presentViewController will show your view controller modally upon the current one, but you can't thrash the presenting one since it's holding and containing ("defining context") the new one.
If you use a navigation controller for your navigation hierarchy (I don't know if you can), you can override the back button and use something like
UIViewController * prev = self.navigationController.viewControllers[self.navigationController.viewControllers.count -2 ]
[self.navigationController popToViewController:prev animated:YES]
With a modal view controller, you may try something like (I haven't tried but it may work)
[self.presentingViewController.navigationController popViewControllerAnimated:YES]
You should write one of these code into the target action of your close button.
iOS doesn't maintain a global stack of controllers in the way that Android does. Each app shows a controller at its root, and that one is responsible for showing the other controllers in the app. Controllers can display other controllers modally using presentViewcontroller:animated:completion: but the presenting controller remains underneath the presented one.
If your current controller is the root controller, then instead of using presentViewcontroller:animated:completion: you'd just do this:
self.view.window.rootViewController = nextViewController;
It's very common for the root controller to be a UINavigationController, which does manage a stack of controllers. If that is the case, and if your current controller is at the top of the stack, you'd do this:
[self.navigationController popViewControllerAnimated:NO];
[self.navigationController pushViewController:nextViewController animated:YES];
If your setup is different, you'd do something different; it's hard to say what without knowing more. But it's most likely that you'd be in the UINavigationController case.
In the viewDidAppear of your nextviewcontroller you could add :
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
NSArray *controllers = self.navigationController.viewControllers;
NSMutableArray *newViewControllers = [NSMutableArray arrayWithArray:controllers];
[newViewControllers removeObjectAtIndex:[controllers count]-2];
self.navigationController.viewControllers = newViewControllers;
}
There is nothing available like this in iOS but you can achieve it doing something like below
NSArray *viewControllers=[self.navigationController viewControllers];
NSMutableArray *newControllers=[[NSMutableArray alloc] init];
for(int i=[viewControllers indexOfObject:self];i<viewControllers.count;i++){
[newControllers addObject:[viewControllers objectAtIndex:i]];
}
[self.navigationController setViewControllers:[[NSArray alloc] initWithArray:newControllers]];
I have tried the method of storing all the view controllers in an array but it didn't work for me . When you try popViewController it will move to the View Controller which is last in the stack.
You can make 2 navigation controllers and switch between them and also switch between the view controllers of a particular Navigation Controller.
For eg.
You can switch between 2 Navigation Controller using the following code:
FirstNavController *fisrtView=[storyboard instantiateViewControllerWithIdentifier:#"firstnavcontroller"];
self.window.rootViewController = firstView;
}else{
SecondNavController *secondView=[storyboard instantiateViewControllerWithIdentifier:#"loginnavcontroller"];
self.window.rootViewController = secondView;
}
If your FirstNavController has 2 ViewControllers then you can switch between them using pushViewController
SecondViewController *sc = [self.storyboard instantiateViewControllerWithIdentifier:#"secondviewcontroller"];
[[self navigationController] pushViewController:sc animated:YES];
and popViewController
[self.navigationController popViewControllerAnimated:YES];
In my program have 6 view controllers.(in storyboard)
Lets define 1,2,3,4,5,6.
1 is my main view.
I want to navigate like this(image bellow).Is it possible to do?
give me a idea to do this navigation.
Yes, u can implement this. This is a simple navigation in iOS using NavigationController.
you have six viewControllers 1, 2, 3, 4, 5, 6.
to do this:
First create a NavigationController and initialize it with ViewController 1 (ie a root View Controller).
Now your navigationController behaves like a stack which contains all ur pushed view controller. NavigationController is only push and pop ur view controllers.
So, every time when u want to navigation first check ur viewController is inside navigationController stack or not. If it is already in stack then pop to that controller, if not then push the same view controller.
for this use following:
In case ViewController3
-(void)popToSelectedViewController
{
NSArray *vc=[self.navigationController viewControllers];
ViewController3 *vc3=nil;
for (int i=0; i<[vc count]; i++)
{
UIViewController *tempVC=[vc objectAtIndex:i];
if([tempVC isKindOfClass:[ViewController3 class]])
{
vc=[vc objectAtIndex:i];
break;
}
}
if(vc3)
{
//If exists inside stack the pop
[self.navigationController popToViewController:vc3 animated:YES];
}
else
{
//If not exists inside stack push ViewController3
ViewController3 *vc3New= [[ViewController3 alloc]initWithNibName:#"ViewController3" bundle:nil];
[self.navigationController pushViewController:vc3New animated:YES];
[vc3New release];
}
}
For initializing ur ViewController1 with navigationController:
if using storyboard
Embed ur initialViewController(ie viewController3) with UINavigationController.
for this:
Step1: open storyboard, and select ur initialViewController(ie viewController3).
Step2: Go to Editor in menu -> Choose Embed In -> Select UINavigationController.
this creates a navigationcontroller and initializes with viewController3 as rootViewController.
if not using storyboard
make property of vc3 (ViewController3) and applicationNavigationController (UINavigationController) in .h
and in .m:
got method "application... didFinishedLaunching...." in appDelegate
and write:
self.vc3=[[ViewController3 alloc]initWithNibName:#"ViewController3" bundle:nil];
self.applicationNavigationController=[[UINavigationController alloc] initWithRootViewController:self.vc3];
self.window.rootViewController=self.applicationNavigationController;
[self.window makeKeyAndVisible];
First You create a navigation controller object
UINavigationController *navCtrl = [[UINavigationController alloc]initWithRootViewController:rootViewController];
self.window.rootViewController = navCtrl;
If you want to go to 1->2,1->3,1->6,etc, create an object for the next viewcontroller and push it to navigation stack
[self.navigationController pushViewController:second animated:YES];
You dont need to do any additional work to go back to the previous view controller. The default back button lets you go back.
If you need to return to the root view controller, then use this:
[self.navigationController popToRootViewControllerAnimated:YES];
if you want to return to any particular view controller, then use this
[self.navigationController popToViewController:viewController animated:YES];
Use UINavigationController.It is nor circular.It can be assumed as stacked approch.That is what navigation controller do
A must read for you
I need to jump between view controllers. For example:
View1: First screen (Just logo)
View2: Download Screen
View3: First app screen (Some Buttons)
View4-View(N): some app screens
When user enters app the app goes to View1->View2 (downloads stuff)->View 3->View4->View5
Then user wish to go to First app screen (View3) he does:
NSArray *array = [self.navigationController viewControllers];
[self.navigationController popToViewController:[array objectAtIndex:2] animated:NO];
The first time user enters the app it goes: View1->View3 (The download screen no longer needed), and I have different push segue to go to View3 so lets assume the user goes to: View1->View 3->View4->View5, now he wishes to go back to View3, so the function:
NSArray *array = [self.navigationController viewControllers];
[self.navigationController popToViewController:[array objectAtIndex:2] animated:NO];
Will return him to View4, and this is WRONG. How can I solve it?
Well if you are using storyboards , what you can do is set your uiviewcontrollers' storyboard id and use it for popping and pushing your views.
Lets say your Storyboards name is MainStoryboard.storyboard
UIStoryboard* sb = [UIStoryboard storyboardWithName:#"MainStoryboard"
bundle:nil];
SettingsListViewController *settingsVC = [sb instantiateViewControllerWithIdentifier:#"SettingsListViewController"]; // #"SettingsListViewController" is the string you have set in above picture
[self.navigationController popToViewController:settingsVC animated:YES];
Above solution should work for you , but If I were you I would change the structure of my app , you say :
View1: First screen (Just logo)
View2: Download Screen
Since View1 is just logo and View 2 is also a view that you skip, you can remove them from navigation controller and make View3 your navigation controller's root view controller and when you need view1 and view2 present them as Modal View Controllers,
when you are done with them lets say; user successfully loaded the app dismiss logo screen and present Download Screen if download successful then dismiss it.
So your View3 Will be there as root view controller, lets say your at View(n) you want to go to home screen which is View3 all you need to do is call
[self.navigationController popToRootViewControllerAnimated:NO];
When you are on view(n) and want to pop to view(n-1) just use
[self.navigationController popViewControllerAnimated:YES];
good luck,
I always use this, and it will work fine in your case. In fact the following line of code is copied to my "Notes" for quick copy/paste.
Be sure to import your ViewController.h file, if not.
for (UIViewController *viewController in self.navigationController.viewControllers) {
if([viewController isKindOfClass:["your ViewController" class]]) {
[self.navigationController popToViewController:viewController animated:NO];
}
}
In the second sequence your navigation stack changes and view3 would be at index 1. so
[[self.navigationController popToViewController:[array objectAtIndex:1] animated:NO];
would be the right way of doing it.
according to your sitation use directly name of viewController
create instance of your viewController,like this
i supposed here that your viewController name is-view3Controller
View3Controller view3Controller=[[View3Controller alloc]init];
[self.navigationController popToViewController:#"view3Controller" animated:NO]
or if you are using storyboard then
View3Controller view3Controller=[self.storyboard instantiateViewControllerWithIdentifier:#"view3Controller"];
[self.navigationController popToViewController:#"view3Controller" animated:NO]
It sounds like View 2 is not being added to your view controllers array at run time, possibly because of the segue you've created.
Try removing the segue that transitions from View 1 > View 3 and pushing the user past View 2 without animating, as your application's logic requires it:
// If the user needs to skip ahead to view 3, conditionally push view 2 and view 3 without animating
[self.navigationController pushViewController:viewController2 animated:NO];
[self.navigationController pushViewController:viewController3 animated:NO];
Alternatively if you left the segue in place could you not look at the size of the UINavigationController viewControllers property and "guess" based on the size whether or not you skipped View 2? If you did then you can adjust the popToViewController method to pop to the correct index. This is, admittedly less elegant and brittle if you need to skip other views as well.
// Check length of viewController array with 'N' views (pseudo code)
if (self.navigationController.viewControllers.length == N-1)
// View 2 was ignored: pop to objectAtIndex:1
else
// View 2 was included: pop to objectAtIndex:2
If I understood you correctly, your view3 has special view controller, so you can use such code:
NSArray *VCs = [self.navigationController viewControllers];
for (UIViewController *VC in VCs)
{
if ([VC isKindOfClass:[**YOUR-VIEW-CONTROLLER** class]]) {
[self.navigationController popToViewController:VC animated:NO];
}
}
It's simple and it works!
for (UIViewController* controller in self.navigationController.viewControllers) {
if ([controller isKindOfClass:[<Your View Controller Name> class]]) {
[self.navigationController popToViewController:controller animated:YES];
return;
}
}
Go like this to a particular view controller
[self.navigationController popToViewController:[[self.navigationController viewControllers]objectAtIndex:1] animated:YES];