I'm showing UINavigationController modally.
For the root view controller, I don't want to show the Navigation bar.
However for deeper controllers, I do want to show it.
I though of doing something like this inside my root view controller :
-(void) viewWillAppear:(BOOL)animated
{
[self.navigationController.navigationBar setHidden:YES];
}
-(void) viewWillDisappear:(BOOL)animated
{
[self.navigationController.navigationBar setHidden:NO];
}
However, this presents issues, when I go back from the first view controller to the root view controller.
The navigation bar is disappearing after pressing the "back" button (inside the first view controller, leaving white space), and not only after the rootViewController finished loading. (Obviously because my code uses viewWillAppear)
Is there a solution for it ?
The only thing I thought of is hidiing the navigation bar permanently, and adding Navigation bar manually to each view controller in the stack.
I hope not to do that since it's much more work, and moreover, I want to use arrow shaped buttons, for which I would have to create custom images.
Appreciate any suggestions.
This should do it, I haven't tested it out, but should work in theory:
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
Related
1st view set nothing.
2nd view navigationBar set hidden and it has UIButton works like this
- (IBAction)back:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
[self.navigationController.navigationBar setHidden:NO];
}
In this situation, when push works navigationBar makes afterimage like this.
How can I disappear this black afterimage?
Put [self.navigationController.navigationBar setHidden:NO]; either in viewWillDisappear: or viewDidDisappear: after calling super in each method.
EDIT:
Also try doing that in the viewWillAppear or viewDidAppear methods of the ViewController that needs the navigation bar shown.
Don't forget to remove the method that hides the navigation bar from the View Controller that you're leaving.
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].
This is the approach I am using:
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.tabBarController hideTabBar];
}
-(void) viewWillDisappear:(BOOL)animated
{
[self.tabBarController showTabBar];
[super viewWillDisappear:animated];
}
With this approach if I add something to the navigation stack the UITabBar will be shown again.
What about if I want UITabBar to be only shown when user navigate away to another tab or press back button, so not all cases of viewWillDisappear?
Pushing a UIViewController on top of navigation stack shouldn't change that
You can use NSNotification as well, so whenever you require to hide tab bar. At that moment fire that notification which will show/hide your tab bar.
Benifit of NSNotification is, you can fire that in entire application life cycle, and it does not be specific to any view controller or any class. One can use that independently from any class/view controller.
Hope this is what you are looking for.
Regards,
Mrunal
Do following in your view will appear method
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillDisappear:animated];
self.navigationController.tabBarController.tabBarController.tabBar.hidden=TRUE;
}
This will remove tabbar from the particular controller . and navigation stack will not change.
This is what I did
At viewDidDisappear, I check if self.navigationController is empty. If it's empty I simply know that the view has been poped out of navigationController, which is the only way to get that view out of window hierarchy.
As the title indicates, the root view is my navigation controller, and it is set to be invisible, which it is on launch. However if I push a view onto the stack and then pop it the navigation bar appears.
Any clues as to why and how to remedy the situation?
You need to hide it every time yours controller's view appears (or disappears) on screen. This is necessary since the bar maintains the state among differents push/pop operations. For example, if you have set it hidden in viewDidLoad within in first controller and in the second one you set it visible, when you pop the second controller the bar mantains the last state you have set.
For example override viewWillAppear and viewWillDisappear methods and hide/unhide the bar there.
- (void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
- (void) viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:NO animated:animated];
}
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
}