I'm using this code
-(void)gotoInformationViewController:(id)sender
{
MoreViewController *moreViewController = [[MoreViewController alloc] init];
[self.navigationController pushViewController:moreViewController animated:YES];
[moreViewController release];
}
to push a MoreViewController (which is UITableViewController) but it doesn't have UINavigationBar when pushed, just UITableView on whole screen.
Try this in your view Controllers
- (void) viewWillAppear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:NO animated:animated];
[super viewWillAppear:animated];
}
and make sure in interface builder your viewcontroller's top bar is not set to none
Related
I have an app where the first screen (the menu for the app) does not need a navigation bar BUT the rest of the app does.
The code I am using works fine in the sense that the navigation bar is not present on the menu screen and is present elsewhere in the app BUT the BIG PROBLEM is that once you go back to the menu the navigation bar appears for about a split second and then disappears.
That is NOT a very smooth transition.
How do I make the transition SMOOTHER so that the navigation bar DOESN'T even appear for a second when I go back to the menu screen?
Here is the code that I am using:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
[self.navigationController setNavigationBarHidden:YES animated:NO];
}
return self;
}
- (void)viewDidLoad {
[self.navigationController setNavigationBarHidden:YES animated:NO];
[super viewDidLoad];
}
-(void) viewDidAppear: (BOOL)animated {
[[self navigationController] setNavigationBarHidden:YES animated:NO];
[super viewDidAppear:animated];
}
Try like this,
-(void) viewWillAppear: (BOOL)animated {
[super viewWillAppear:animated];
[[self navigationController] setNavigationBarHidden:YES animated:YES];
}
Hope it may helps you...
In your first view controller:
- (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];
}
In your second view controller (not needed, but good practice for code clarity) :
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
set this in the view did disappear in first screen of the app
[[self navigationController] setNavigationBarHidden:NO animated:YES];
and this in viewdiddisappear of the second VC
[self.navigationController setNavigationBarHidden:YES animated:NO];
Instead of hiding and showing the navigation bar, you can update the alpha for the navigation bar. It will animate smoothly during the transition. For the view controller with transparent nav bar, instead of modifying the nav bar, create a navbar (or just the back button and title etc.) manually in the second controller's view. We will then hide the navbar when transitioning from first view controller to the second one.
On your second controller's viewWillDisappear and on your first view controller's viewWillAppear:, set the navigation bar alpha to zero using self.navigationController.navigationBar.alpha = 0;. Since this is in animation block, this will make the navigation bar disappear during the push animation.
Set the alpha back to one in second controller's viewWillAppear and first controller viewWillDisappear.
I have a main window that pops a modal view controller. When done in this modal view controller, it returns to the main window then dismisses itself.
Then the main windows pops a new Modal view controller with animated=YES.
The problem is that the dismiss call that is done inside the first modalviewcontroller applies to both and SecondController is never shown.
Putting the first dismiss before or after the parent call does not change anything.
If first dismiss is set wih animate= NO, everything works fine. But I need the animation.
Main.m
- (void) entry {
FirstController *nextWindow = [[FirstController alloc] initWithNibName:#"theNIB" bundle:nil];
nextWindow.caller = self;
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:nextWindow];
[self.navigationController presentModalViewController:navController animated:YES];
[nextWindow release];
[navController release];
}
- (void) thingsDoneInFirstModalController:(OBJECT)returnValue retval2:(OBJECT2)returnValue2 {
[self display2ndController];
}
- (void) display2ndController {
SecondController *nextWindow;
nextWindow = [[SecondController alloc] initWithNibName:#"NIB2" bundle:nil];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:nextWindow];
[self.navigationController presentModalViewController:navController animated:YES];
[navController release];
[nextWindow release];
}
1st ModalViewController.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self.navigationController dismissModalViewControllerAnimated:YES];
[self.caller thingsDoneInFirstModalController:theResult retval2:someMoreResult];
}
What may I do ?
I don't want to catch anything in view....Disapear...
Why does the dismiss colides as they are not called from the same navigation controller ?
The reason is likely the animation when you dismiss it. Try showing the second modal window using the performSelector:withObject:afterDelay:, a method inherited from NSObject. Reference here.
I want to use a modal view (UIViewController) as a "normal" view, which can be pushed on the navigation controller stack. Normally, a modal view is presented like this:
LoginViewController *myView = [[MyViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:myView];
[self.navigationController presentModalViewController:navController animated:YES];
[myView release];
myView = nil;
[navController release];
navController = nil;
But I want to do something like this:
[[self navigationController] pushViewController:myView animated:YES];
The problem is that my modal view has a right and a left button. So I would have to check how the view is loaded and present the buttons in another way. The idea behind this is to have the back button. So I can use the same modal view a few times.
Edit:
#petert:
Now I followed your example. My issue is that I'm using a UINavigationBar for the modal view. To get this UINavigationBar I create a navigation controller. I'm using the navigation bar because I have my buttons in it. So checking if parentViewController is of type UINavigationController does not work for me. I'm always getting a modal view. Here is how I do it:
// load modal view
MyViewController *myView = [[MyViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:myView];
[[self navigationController] presentModalViewController:navController animated:YES];
[navController release];
navController = nil;
[myView release];
myView = nil;
// load as normal view
MyViewController *myView = [[MyViewController alloc] init];
[[self navigationController] pushViewController:myView animated:YES];
Good tips in this StackOverflow answer.
I prefer to use UIViewController's property:
#property(nonatomic, readonly) UIViewController *parentViewController
in a view controller's subclass:
Look at the value of the controller's parentViewController property. If it's an instance of UINavigationController, then you're in the navigation stack. If you're being displayed modally, it'll be an instance of your last view controller.
So in -viewDidLoad for example:
- (void)viewDidLoad
{
if ([self.parentViewController isKindOfClass:[UINavigationController class]])
{
// navigation controller
self.title = #"...";
}
else
{
// modal
self.title = #"Modal";
// add cancel and done buttons now...
}
}
Or, a pretty simple solution would be to customize your init method to your MyViewController class to encode your intent for the view controller.
Add the following to the MyViewController header:
#interface MyViewController : UIViewController
{
BOOL modal;
}
- (id)initForModal:(BOOL)isModal;
#end
Now in the implementation file:
#interface MyViewController ()
#property (nonatomic) BOOL modal;
#end
#implementation MyViewController
#synthesize modal;
- (id)initForModal:(BOOL)isModal;
{
if (self = [super initWithNibName:#"MyViewController" bundle:nil])
{
self.modal = isModal;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
if (self.modal)
{
// add cancel and done buttons …
}
else
{
// assuming we're presented from a navigation view …
}
}
Now to use this modally:
// load modal view
MyViewController *myView = [[MyViewController alloc] initForModal:YES];
Or not modally:
// load as normal view
MyViewController *myView = [[MyViewController alloc] initForModal:NO];
I'm assuming you're creating the view controller(s) from NIBs, but as always see the View Controller Progamming Guide for iOS and especially the section titled "Defining a Custom View Controller Class".
For clarification: myView isn't modal. You just present it as a modal one.
If you just push it into a UINavigationController hierarchy it will behave like a "normal" one.
You can't push the same view controller onto the navigation stack several times. Just once.
Also see this for how to customize the view:
SO modal question
i have class like this
DrillDownAppAppDelegate.h
PictureCell.h
RootViewController.h
SlideShowViewController.h
DrillDownAppAppDelegate.m
PictureCell.m
RootViewController.m
SlideShowViewController.m
i want to hide my navigation bar,in class SlideShowViewController when i tap on the screen
but it doesn't work
my code is
[self.navigationController setNavigationBarHidden:YES animated:YES];
Assuming RootViewController is the visible view controller on the UINavigationController stack, simply push SlideShowViewController as normal, however in SlideShowViewController, include this code:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear];
[self.navigationController setNavigationBarHidden:NO animated:animated];
}
A very simple question: My iPhone app has a button in MainWindow.xib. When I press that button a new view should load. That view will contain a nice navigation controller. How can I do that?
All the information I've found is about apps that start directly from a navigation controller. I need to load the nav controller after a button click.
Many thanks!
Another way to go about this is to simply hide the navigation bar in your root controller:
- (void) viewDidLoad {
...
if (![self.navigationController isNavigationBarHidden])
[self.navigationController setNavigationBarHidden:YES animated:NO];
...
}
That way, you have a nice, clean root controller with no navigation bar in the way.
When you click on a button in your root controller, you simply push in a new view and un-hide the navigation bar:
- (IBAction) pushAnotherView:(id)sender {
AnotherViewController *anotherViewController = [[AnotherViewController alloc] initWithNibName:#"AnotherViewController" bundle:nil];
[self.navigationController pushViewController:anotherViewController animated:YES];
if ([self.navigationController isNavigationBarHidden])
[self.navigationController setNavigationBarHidden:NO animated:YES];
[anotherViewController release];
}
If you have some notification or other action that brings you back to the root view controller, just hide the notification bar again:
- (void) viewWillAppear:(BOOL)animated {
if (![self.navigationController isNavigationBarHidden])
[self.navigationController setNavigationBarHidden:YES animated:YES];
[super viewWillAppear:animated];
}