I have 2 ViewControllers directly connected with a push segue. I am navigating from first to second view controller by calling [self performSegueWithIdentifier:#"segueIdentifier" sender:sender]. On the second one I have an IBAction method that is bound to a "Done" button. Pressing that button should basically cause the first view controller to be displayed (sort of a back button). I managed to do that with:
NSArray *viewControllers = self.navigationController.viewControllers;
[self.navigationController popToViewController:[viewControllers
objectAtIndex:0] animated:YES];
I did try to achieve the same effect by using:
[self dismissViewControllerAnimated:YES completion:nil];
No matter what I tried though this didn't do the job. I am trying to understand what exactly am I missing but I can't figure it out. Does dismissViewControllerAnimated method work only with Modal segues ( this is the only thing that came to mind ).
Thank you
Yes,
- (void)dismissViewControllerAnimated:(BOOL)flag completion:(void (^)(void))completion
is when a UIViewController is displayed modally.
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
should do what you are seeking.
So basically, in your second VC:
[self.navigationController popViewControllerAnimated:YES];
You will save you a lot of trouble if you read the UIViewController and UINavigationController references. Twice ;)
Related
I have looked around but haven't found a satisfying answer. My problem is that whenever I call popToRootViewControllerAnimated:(BOOL) it is not doing anything. When I NSLog it, it logs (null).
Let me back up a bit here. I have a table view controller that has a list of things, at the navigation bar up top there is an option to add and that takes me to a new view controller with a segue "Present as PopOver" which gets rid of the principal or main navigation bar. So I made one manually and added 2 bar button items "Cancel" and "Add". When "Cancel" is tapped, it should take the user back to the table view controller and discard changes, when "Add" button is tapped, it should also take user back to the previous table view controller with the changes. But it's not doing anything.
Here is my code.
- (IBAction)cancelButton:(UIBarButtonItem *)sender {
UINavigationController * navigationController = self.navigationController;
NSLog(#"%#", navigationController);
NSLog(#"cancel tapped though");
ListingTableViewController *rootController = [[ListingTableViewController alloc] init];
[navigationController popToRootViewControllerAnimated:NO];
[navigationController pushViewController:rootController animated:YES];
}
As far as the segue, this view controller is not connected to anything, or should I connect it? This is a noobish question indeed. Here is my xcode screenshot.
Check this link for the screenshot of the storyboard
http://i.stack.imgur.com/lqnCF.png
You must call
- (IBAction)cancelButton:(UIBarButtonItem *)sender {
NSLog(#"cancel tapped though");
[self dismissViewControllerAnimated:YES completion:nil];
}
instead of popToRootViewControllerAnimated because your VC presented and not pushed!
When presenting a view, you are not pushing it in your navigation controller, but having it presented. To dismiss it, try using [self.presentingViewController dismissViewControllerAnimated:NO completion:nil].
Im trying to return to a specific ViewController in it's current state after going from that ViewController to another using presentViewController.
But when I try to close the other ViewController (with dismissViewController) I get a white screen.
RootViewController *rootViewController
= [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil]
instantiateViewControllerWithIdentifier:#"RootViewController"];
[self presentViewController:rootViewController animated:YES completion:nil];
This isn't an option either because that instantiates a new viewcontroller and I want the old ViewController in its current state.
Do I need to pass the RootViewController as an argument when presenting the other ViewController or is there another option to return to the RootViewController in its current state?
Yes, there is a way to return original screen.
I met just like problem but solved it with following code line
[self dismissViewControllerAnimated:YES completion:nil];
one way to address this is to avoid having one view controller responsible for presenting and dismissing the other one.. what you can do is create a controller of controllers (give it a singelton method).. and have that object basically keep a reference to any view controller you are interested in maintaining its state. That way you wouldn't have worry about what's going on behind the scenes when you dismiss or present a view controller.
I've spent hours and I cant figure this out. I have a detail view controller (UITableView) which is launched here:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
EventLocationDetailController *newDetailViewController = [[EventLocationDetailController alloc] initWithNibName:#"EventLocationDetailController" bundle:nil];
self.eventDetailController = newDetailViewController;
[self.navigationController pushViewController:self.eventDetailController animated:YES];
[newDetailViewController release];
}
In the detail view controller there is a button method which calls the below method to display a slide-in-slide-out animation confirming the users choice:
-(void)confirmLastActionWithMessage:(NSString *)message {
ConfirmActionViewController *newConfirmActionViewController = [[ConfirmActionViewController alloc] initWithNibName:#"ConfirmActionViewController" bundle:nil];
self.confirmActionViewController = newConfirmActionViewController;
[newConfirmActionViewController release];
[[self.view superview] addSubview:self.confirmActionViewController.view];
}
Protocol method called by the ConfirmActionViewController indicating that the animation is finished.
-(void)didFinishConfirmDisplay:(UIView *)viewToRemoveFromSuperview {
[viewToRemoveFromSuperview removeFromSuperview];
}
This works perfect the first time I press the button. If I pop the detail controller and push it back on to the stack and press the button again, nothing happens and the detail controller's superview is nil every time I invoke the method after that. Superview is not nil in the viewWillAppear method for the detail view, only when It gets to the confirmLastActionWithMessage method. No other user interaction happens in between. How do I get the superview back? I have a similar code that works without animation.
I've also noticed that the detail view controller hasn't called dealloc when popped off the stack. Not sure where the problem is.
Thanks.
EDIT 1
OK. I replaced the addSubview line with this one:
[self.view insertSubview:self.confirmActionViewController.view atIndex:0];
and the animation view appeared underneath one of the table cells. Could one of the table cells steal the superview?
Well I don't really understand why you should add the subview to the superview. Why not add it just to self.view
I may not be able to explain why there is no superview but try either adding the controller view to self.view or
[[[[UIApplication sharedApplication] delegate] window] addSubview:yourview];
This will render the view on top of everything.
I need a little help on a problem with navigation controllers.
I have a navigationController with 4 ViewControllers pushed. The last vc I push presents a further ViewController modally. The modal ViewController presents an ActionSheet. Depending on the user's answer I either dismiss the modal ViewController only or I want to go back to the root ViewController.
In the ViewController presented modally I have:
- (void) dismissGameReport
{
[[self delegate] GameReportModalWillBeDismissed:modalToPopToRoot];
}
In the last ViewController pushed onto the navigationController stack I have:
- (void)GameReportModalWillBeDismissed: (BOOL)popToRoot;
{
if (popToRoot)
{
[self.navigationController popToRootViewControllerAnimated:NO];
}
else
{
[self dismissModalViewControllerAnimated:YES];
}
}
Dismissing the modal view controller works fine.
However,
[self.navigationController popToRootViewControllerAnimated:NO];
does not cause the root ViewController to display its views. Adding some log info I see that after the message to self.navigationController the stack is correctly popped but execution continues sequentially. The screen still shows the view of the modal ViewController.
As a workaround I tried always dismissing the modal view controller and in the ViewWillAppear method have the popToRootAnimated message. No difference. Still the stack of controllers is popped but the screen continues showing my modal view controller's view and execution continues sequentially.
Could someone help me please?
I like these deceptive questions. It seems very simple, until you try to do it.
What I found was that basically you do need to dismiss that modal view controller, but if you try to pop from the navigation controller on the next line things get mixed up. You must ensure the dismiss is complete before attempting the pop. In iOS 5 you can use dismissViewControllerAnimated:completion: like so.
-(void)GameReportModalWillBeDismissed:(BOOL)popToRoot{
if (popToRoot){
[self dismissViewControllerAnimated:YES completion:^{
[self.navigationController popToRootViewControllerAnimated:YES];
}];
}
else{
[self dismissModalViewControllerAnimated:YES];
}
}
But I see you have 4.0 in your question tags. The solution I found for <iOS 5 is far less pretty but should still work, and it sounds like you were already on the trail. You want viewDidAppear: not viewWillAppear:. My solution here involves an ivar, lets say:
BOOL shouldPopToRootOnAppear;
And then your GameReportModalWillBeDismissed: would look something like this:
-(void)GameReportModalWillBeDismissed:(BOOL)popToRoot{
shouldPopToRootOnAppear = popToRoot;
[self dismissModalViewControllerAnimated:YES];
}
And your viewDidAppear: would look like this...
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
if (shouldPopToRootOnAppear){
[self.navigationController popToRootViewControllerAnimated:YES];
return;
}
// Normal viewDidAppear: stuff here
}
I have a problem about viewController. I created a program What is viewController based applicaiton. There is 4 button on mainViewController. I used this code for calling mainviewController
-(void) applicationDidFinishLaunching:(UIApplication *)application{
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
}
Then click to any button on homePage , I go to the other viewController. This code for call another viewController belong
-(IBAction)clickCalendarButton{
calendarButton.selected=YES;
[calendarButton
setImage:[UIImage imageNamed:#"afvalkalender_pressed.png"] forState:(UIControlStateHighlighted+UIControlStateSelected)];
GarbageCalendar *garbageCalendar = [[GarbageCalendar alloc] initWithNibName:#"GarbageCalendar" bundle:nil];
[self presentModalViewController:garbageCalendar animated:YES];
}
And then I want to go home page from another viewController. But I didn' go home page viewController.
Create button on detail view controller, which calls something like this:
- (IBAction)goBack {
[self dismissModalViewControllerAnimated:YES];
}
If you want to keep your current UI design, based on modal view controllers, then I think you should ensure that your other view controllers have got a button that does the dismiss of the view. Say, e.g., a "Back" or "Done" button. When you click on that button, a delegate method is called that executes: [self dismissModalViewControllerAnimated:YES];
Look also at this document for more info, section "Dismissing a Modal View Controller".
If you would like to consider alternative approaches to your UI, you could look into using a UINavigationController, which would make your life a little bit easier with navigating back from one controller to another.