I created a new window based application, and a RootViewController that sublcasses UIViewController. I created a UINavigationController in the AppDelegate and when I add the UINavigationController's view to the window, I do see the navigation bar on top. However, I cannot seem to add a button to the navigation bar - there are no compile errors, but the button (and the title) does not show up. The code is below:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
RootViewController * rootViewController = [[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
UIBarButtonItem *next = [[UIBarButtonItem alloc] initWithTitle:#"Next" style:UIBarButtonItemStyleDone target:nil action:nil];
navigationController.title = #"Foo";
navigationController.navigationItem.rightBarButtonItem = next;
[self.window addSubview:navigationController.view];
// Override point for customization after application launch.
[self.window makeKeyAndVisible];
return YES;
}
What am I doing wrong?
Change this:
navigationController.navigationItem.rightBarButtonItem = next;
to this:
rootViewController.navigationItem.rightBarButtonItem = next;
May be style:UIBarButtonItemStyleDone only used in editing mode is YES. If in Root controller or sub view controller, you may try call self.editing = YES, but in AppDelegate you can't.
Related
I'm having troubles with an UINavigationController which viewControllers property is null after tapping Back on a previously pushed view controller.
The root view controller in AppDelegate is defined with that code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
StartViewController *startVc = [[StartViewController alloc] initWithNibName:#"StartViewController" bundle:nil];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:startVc];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
return YES;
}
At StartViewController I'm hiding the navigation bar within - (void)viewWillAppear:(BOOL)animated where I've also a UIButton instance where I push the next view controller when tapping with that code:
- (IBAction)buttonTapped:(id)sender {
PhilosophyViewController *philsophyVc = [[PhilosophyViewController alloc] initWithNibName:#"PhilosophyViewController" bundle:nil];
[self.navigationController pushViewController:philsophyVc animated:YES];
}
I'm heading over to the next view as expected. But when tapping the Back button at the navigation bar, the previous view (StartViewController) is empty and when checking the viewControllers property of the navigation controller - it is null?
Any idea?
Thanks in advance.
The back button of the pushed viewController can be hooked up to an IBAction
-(IBAction)backButtonPressed:(id)sender{
[self.navigationController popViewControllerAnimated:YES];
}
This should pop you back to the previous view controller front the stack.
Hope this helps.
Please, help to understand the navigation. I'm working with xibs. The scheme is: https://www.dropbox.com/s/o82fxpte0hmyxcq/Scheme_Simple.jpg .
Here's my code :
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
FirstViewController *firstViewController = [[firstViewController alloc] initWithNibName:#"firstViewController" bundle:nil];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:firstViewController];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
return YES;
}
#implementation FirstViewController
- (IBAction)button1Tapped:(id)sender {
SecondViewController *secondViewController = [[SecondViewController alloc] init];
secondViewController.title = #"View2";
[self.navigationController pushViewController:secondViewController animated:YES];
}
#implementation SecondViewController
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
ThirdViewController *thirdViewController = [[ThirdViewController alloc] init];
thirdViewController.title = #"View3";
if (indexPath.row == 0) {
[self.navigationController pushViewController:thirdViewController animated:YES];
[secondViewTableView deselectRowAtIndexPath:indexPath animated:YES];
}
}
So, I have questions:
Where should I create the next view? In my code view has created in "previous" class: view2 created in FirstViewController, view3 created in SecondViewController etc. All new ViewControllers are inside the method that initiates the navigation, is it right way? I think it's wrong, but the navigation is working.
Problems with headers in the navigation bar. It turns out that the title of view2 is only displayed when moving from view1 to view2, but when going back from view3 to view2 – header disappears. I googled, tried to add self.title = #"name" to viewDidLoad, initWithNibName, viewWillAppear – none of this works.
So I've solved the problem with disappearing title of navigation bar. The problem was in my custom back button: self.navigationItem.title = #"";
It was working and title "Back" from my back button disappeared but also title of navigation bar disappeared too. The right way to make back button untitled is:
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:#"" style:UIBarButtonItemStyleBordered target:nil action:nil];
[self.navigationItem setBackBarButtonItem:backButton];
Not sure how to title this question, but i'v got such a problem: Up until now i my app runs mainly in one navigationcontroller with table views. But now i'm trying to integrate dropdown settings menu, and can't get it properly done.
The way i'v done now and it works
The changeController is called from one button. ChangeController is in appdelegate.
- (void) ChangeController
{
self.window.backgroundColor = [UIColor blackColor];
DropDownExample *e = [[DropDownExample alloc] initWithStyle:UITableViewStyleGrouped];
self.navigationController = [[UINavigationController alloc] initWithRootViewController:e];
[e release];
[self.window addSubview:self.navigationController.view];
self.window.backgroundColor = [UIColor blackColor];
[self.window makeKeyAndVisible];
}
But this approach has consequances - there is no transition if button is pressed, the settings menu appears instantly, you cannot go back via navigation bar above (nothing there).
So how to do this properly?? I'm new to ios, so just tell me the whole idea how to do this.
Didfinishlaunchingwithoptions method from appdelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease
];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
TableViewController *tableVC = [[TableViewController alloc] initWithNibName:#"TableView" bundle:nil andType:CONTROLLER_TYPE_FIRST];
UINavigationController *navC = [[UINavigationController alloc] initWithRootViewController:tableVC];
self.navigationController = navC;
[tableVC release];
[navC release];
self.window.rootViewController = _navigationController;
[self.window makeKeyAndVisible];
return YES;
}
Ok, here's the answer. Write the method changeController in the same class where the Button exists which calls changeController
In the method, write this.
- (void) ChangeController
{
DropDownExample *e = [[DropDownExample alloc] initWithStyle:UITableViewStyleGrouped];
[self.navigationController pushViewController:e animated:YES];
[e release];
}
What you want is to insert new UIViewController on the top of the present Stack. If you would be having a navigation Bar at the top by default then there would be a back Btn by default, which would pop up that controller.
The problem is pretty simple to understand with pictures.
I have a UINavigationController that allow the user to switch between to views.
The first view contains a search bar and a table view like so :
The second is a basic view where information about the cell are display
When I click on the search bar, the navigation controller gets hidden and the search bar is now at the top.
Now, if I click on a cell, it goes to the second views, but the navigation bar is first hidden like below :
And then, it automatically appears like that :
I have tried a couple of things like show the navigation bar before pushing the next view controller but it is quite ugly..
Does anyone know how to have the show the navigation bar directly on the second view (like in the contact application)?
[UPDATE] : Code
AppDelegate.m (I'm talking about navigationcontroller2)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
FirstViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
SecondViewController *viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
viewController1.managedObjectContext = [self managedObjectContext];
viewController2.managedObjectContext = [self managedObjectContext];
viewController1.viewController2 = viewController2;
UINavigationController *navigationcontroller1 = [[UINavigationController alloc] initWithRootViewController:viewController1];
[navigationcontroller1.navigationBar setTintColor:[UIColor lightGrayColor]];
UINavigationController *navigationcontroller2 = [[UINavigationController alloc] initWithRootViewController:viewController2];
[navigationcontroller2.navigationBar setTintColor:[UIColor lightGrayColor]];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:navigationcontroller1, navigationcontroller2, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
FirstView.m
- (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar {
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (!noResultsToDisplay) {
PinDetailsViewController *pinDetailsViewController = [[PinDetailsViewController alloc] initWithNibName:#"PinDetailsViewController" bundle:nil];
NSManagedObject *managedObject = [fetchedResultsController objectAtIndexPath:indexPath];
Pin *pin = (Pin *) managedObject;
[self.navigationItem setTitle:#"Pins"];
[self.navigationController pushViewController:pinDetailsViewController animated:YES];
[pinDetailsViewController updateWithPin:pin];
}
}
If you need anything else, just ask but I think it's all there.
Try to use this code in each viewcontroller.
- (void) viewWillAppear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:NO animated:animated];
}
- (void) viewWillDisappear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
Before you push the new view controller, you should unhide the navigation bar:
[self.navigationController setNavigationBarHidden:NO animated:YES];
I had a similar problem with the position of my navbar. Mine was moving up behind the status bar, and I fixed the issue by manually setting the navbar frame:
-(void)adjustNavBarOrigin
{
CGRect r = self.navigationController.navigationBar.frame;
r.origin = CGPointMake(0, 20); // 20 is the height of the status bar
self.navigationController.navigationBar.frame = r;
}
I had to call this method in a number of places, including viewWillAppear: and didRotateFromInterfaceOrientation:, but it worked a treat :)
Hiding the UINavigationBar can disturb the properties sometimes. Try using the property alpha instead of hidden.
I started a project in Xcode 4.2 using tab view template. In the app delegate I added a third tab by code just like first and second tabs. Then I created a third view controller class with a nib file.
When I run this app, I see all three tabs but when I click on the third tab, it crashes.
I noticed the first and second nib files have a dark bar at the bottom(probably representing the tab bar) of the view but the new third nib file that I created lacks it. Any idea how I make this third tab work?
Thanks
This is how I add the third view controller.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1, *viewController2, *viewController3;
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController_iPhone" bundle:nil];
viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController_iPhone" bundle:nil];
viewController3 = [[ThirdViewController alloc] initWithNibName:#"ThirdViewController_iPhone" bundle:nil];
} else {
viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController_iPad" bundle:nil];
viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController_iPad" bundle:nil];
}
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, viewController3, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
In the tab bar controller make sure the class of the view controller for the tab is the same as the view controller class you created.
Also check the logs, it will probably have a very informative message for you as to why it crashed.
Edit:
Never mind, you are passing in an un-initialized view controller for viewController3. Set all of those initial values to nil.