I started out with a navigation based project and am pushing further views onto the controller. The problem is that if I do not give a title to the navigation item then the back button is not drawn! Only if I give the navigation bar a title, will the back button come. It seems apple could'nt write "back" or "go back" in case of NO title. I do not want to give the navigation item a title(I'll use a label inside my view). So how do I fix this?
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = #"Home"; /// <- without setting the title, the back button won't show !
}
In the view didLoad method, if I remove the title, the back button won't show
Just create the back button yourself:
- (void)viewDidLoad
{
[super viewDidLoad];
UIBarButtonItem *back = [[UIBarButtonItem alloc] initWithTitle:#"Back"
style:UIBarButtonItemStylePlain
target:nil
action:nil];
[[self navigationItem] setBackBarButtonItem:back];
[back release];
}
(If you prefer dot notation, self.navigationItem.backBarButtonItem = back;)
Related
I am using a webView to show Instagram login. However there is no cancel button. How do I add a cancel button? I tried to add a cancel button on top of the webView but it's not relative to the webView, in that if you were to drag down that window as if to refresh it,the cancel button will remain static. Is it possible to have it right next to the Log in button? If not is the uINavigationBar the best way?
If all you want from the cancel button is to close the webView, you can have the webView embedded in a UIViewController which is added to the UINavigationController stack. Then you will be able to add the Cancel Button as a UIBarButtonItem on the navigation bar.
For example:
Your home screen is MainViewController and you tap a button to show Instagram in webView. Then in your MainViewController.m (which is already the rootViewController of the UINavigationController) do this:
// Init your web view controller and push to UINavigationController stack to show it.
WebViewController *yourWebViewContainer = [self.storyboard instantiateViewControllerWithIdentifier:#"YourControllerIdentifier"];
[self.navigationController pushViewController:yourWebViewContainer animated:YES];
Then in your WebViewController.m file, create the cancel button in viewDidLoad:
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Cancel" style:UIBarButtonItemStylePlain target:self action:#selector(cancelTapped:)];
}
You can't add the cancel button beside the Login button because it's in web view which contains html code, but you can add button on navigation bar using this code:
- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:#"Cancel" style:UIBarButtonItemStylePlain target:self action:#selector(cancelAction:)];
self.navigationItem.rightBarButtonItem = cancelButton;
}
-(void)cancelAction:(UIButton *)sender{
//do cancel action
}
Trying to customize my back button in a drilldown navigation controller.
On my one view controller I have an Add button where the code programatically generates a new UIViewController:
- (void)add:(id)sender
{
MyAddViewController *addController = [[MyAddViewController alloc] initWithNibName:#"MyAddViewController" bundle:nil];
[self.navigationController pushViewController:addController animated:YES];
[addController release];
}
This works and when I click the add button it drills down into the new view. Inside the viewDidLoad method of MyAddViewController.m I have:
self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil] autorelease];
But this isn't working. The back button in the navigation controller remains the title of the previous view's controller on the stack. It seems that line does nothing. Did I miss something?
Thanks
self.navigationItem.backBarButtonItem is for the back button that appears on the view pushed by the view controller. So you need to move that line to the previous view controller.
This will only work on each child after the viewController that has self.navigationItem.backBarButtonItem.
You're confusing the backBarButtonItem and the leftBarButtonItem. From the UINavigationItem docs on backBarButtonItem:
When this item is the back item of the
navigation bar—when it is the next
item below the top item—it may be
represented as a back button on the
navigation bar. Use this property to
specify the back button. The target
and action of the back bar button item
you set should be nil. The default
value is a bar button item displaying
the navigation item’s title.
So, if you were to change:
self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil] autorelease];
To:
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil] autorelease];
I believe you would get the desired effect.
You can't replace the backBarButtonItem, but you can use the leftBarButtonItem to override it. But to get the new button to perform operate the same as the back button, you do need to set the target and action of the new button something like:
- (void)dismissMyView {
[self.navigationController popViewControllerAnimated:YES];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
initWithTitle:#"Quit" style: UIBarButtonItemStyleBordered
target:self action:#selector(dismissMyView)];
}
If ViewController A push ViewController B meanwhile we want to set the back bar button tittle, we should set "self.navigationItem.backBarButtonItem = ..".if it was set in ViewController B, it will not work as we want.
I have a tab bar controller as my root view with 5 navigation controllers (one for each tab). The navigation bar in each tab will have a button that has the same functionality across all tabs. Is there an easier way to add this button (and respond to selection) than copy/pasting it into each navigation controller?
EDIT:
In my custom navigation controller's child view controller, I have:
- (void)viewDidLoad
{
[super viewDidLoad];
...
CustomNavigationController *navController = [self.storyboard instantiateViewControllerWithIdentifier:#"HomeNavigationController"];
[navController addNotificationsButton:YES searchButton:NO];
}
and in the custom navigation controller I have:
-(void)addNotificationsButton:(BOOL)notifications searchButton:(BOOL)search { //Choose which bar button items to add
NSMutableArray *barItems = [[NSMutableArray alloc]init];
if (notifications) {
//Create button and add to array
UIImage *notificationsImage = [UIImage imageNamed:#"first"];
UIBarButtonItem *notificationsButton = [[UIBarButtonItem alloc]initWithImage:notificationsImage landscapeImagePhone:notificationsImage style:UIBarButtonItemStylePlain target:self action:#selector(notificationsTap:)];
[barItems addObject:notificationsButton];
}
if (search) {
//Create button and add to array
UIBarButtonItem *searchButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:#selector(searchTap:)];
[barItems addObject:searchButton];
}
[self.navigationItem setRightBarButtonItems:barItems];
}
But I just get an empty navigation bar when the child view controller loads. Any ideas?
EDIT 2:
I just had to add an argument for the view controller who's navigation bar I wanted to add buttons to. Here is the final implementation...
for CustomViewController.m:
- (void)viewDidLoad
{
[super viewDidLoad];
...
CustomNavigationController *navController = [self.storyboard instantiateViewControllerWithIdentifier:#"HomeNavigationController"];
[navController addNotificationsButton:YES searchButton:NO forViewController:self];
}
For CustomNavigationController.m
-(void)addNotificationsButton:(BOOL)notifications searchButton:(BOOL)search forViewController:(UIViewController*)vc { //Choose which bar button items to add
NSMutableArray *barItems = [[NSMutableArray alloc]init];
if (notifications) {
//Create button and add to array
UIImage *notificationsImage = [UIImage imageNamed:#"first"];
UIBarButtonItem *notificationsButton = [[UIBarButtonItem alloc]initWithImage:notificationsImage landscapeImagePhone:notificationsImage style:UIBarButtonItemStylePlain target:self action:#selector(notificationsTap:)];
[barItems addObject:notificationsButton];
}
if (search) {
//Create button and add to array
UIBarButtonItem *searchButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:#selector(searchTap:)];
[barItems addObject:searchButton];
}
vc.navigationItem.rightBarButtonItems = barItems;
}
You need to create a subclass of UINavigationController,
configure it as you want (so with your button),
and set that as class of your 5 Navigation Controller.
Obviously i can't write here all your apps, but the important is that you have a way.
If you are a developer at the first times, i encourage you to study about subclassing etc.
Subclass navigation bar and add button as part of subclass. Now you can use 5 instances of the subclass instead of the 5 base navigation bars and cut out the repeated work of adding the buttons.
I started my xcode project from a NavigationViewController template. And now, when I push a view, that view comes up with an edit button by default and no back bar button. I have commented out the editButton code and the corresponding setEditing delegate method. But I can not get the back button to show up. What am I doing wrong?
Pushing the new view:
PlaylistViewController *playlistViewController = [[PlaylistViewController alloc] init];
playlistViewController.managedObjectContext = self.managedObjectContext;
[self.navigationController pushViewController:playlistViewController animated:YES];
[playlistViewController release];
in my PlaylistViewController:
- (void)viewDidLoad {
[super viewDidLoad];
self.title = #"";
// self.navigationItem.leftBarButtonItem = self.editButtonItem;
// doesn't matter if this is here or not
self.navigationItem.hidesBackButton = false;
UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:#selector(insertNewObject)];
self.navigationItem.rightBarButtonItem = addButton;
[addButton release];
}
When you tell a UINavigationController to pushViewController, it automatically sets the navigationItem.leftBarButtonItem to be a button with the title of the previous UIViewController's title.
If no title is set, the default text is "Back".
If the title is set to "", no button will display at all.
self.title = #"";
Try changing this text and your back button should match the text set here.
Or you can manually override the text of the leftBarButtonItem from your new UIViewController.
I dropped in a UINavigationBar in UIInterfaceBuilder. I present this view modally and just want a UIBackBarButton to return to my last view. I have an outlet and property to this UINavigationBar declared. I thought in my viewDidLoad method, I could create a UIBackButton like this:
UIBarButtonItem *backButton =
[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonItemStyleBordered
target:self
action:#selector(goBack)];
self.navigationItem.backBarButtonItem = backButton;
[backButton release];
But I do not see my UIBackBarButtonItem on the UINavigationBar. I think I am doing something wrong here since I don't think my UINavigationBar knows I'm trying to add this UIBackBarButtonItem to it in this way. Would I have to do create an NSArray, put the button in it, and setItems for the NavigationBar instead?
I'm confused on how the navigationItem property works vs the setItems of the UINavigationBar as well. Any help would be appreciated. Thanks!
You are trying to set the Back Button Item in a modal view which doesn't add a backBarButtonItem. This what causes the Button (or any sort of back button for that matter) not to show. The backBarButtonItem is mainly for use with Pushed View Controllers which have a Back Button added from the parent (next item below) when you push a new view controller (top item). The Apple UINavigationItem Documentation says:
When this item is the back item of the navigation bar—when it is the next item below the top item—it may be represented as a back button on the navigation bar. Use this property to specify the back button. The target and action of the back bar button item you set should be nil. The default value is a bar button item displaying the navigation item’s title.
To get the Back Button on the left side like you wish, Try changing
self.navigationItem.backBarButtonItem = backButton;
to
self.navigationItem.leftBarButtonItem = backButton;
making a call such as this from a view controller
{
NextViewController* vcRootView = [[NextViewController alloc] initWithNibName:#"NextView" bundle:[NSBundle mainBundle]];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:vcRootView];
[vcRootView release];
[self.navigationController presentModalViewController:navController animated:YES];
[navController release];
}
will present NextViewController as a Modal view on the calling view and NextViewController will have a navigationController for it.
In The NextViewController implementation file all you need is this
- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem* backButton = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:self
action:#selector(barButtonBackPressed:)];
self.navigationItem.leftBarButtonItem = backButton;
[backButton release];
}
-(void)barButtonBackPressed:(id)sender{
[self dismissModalViewControllerAnimated:YES];
}
to have the back button to dismiss the modalview. Hope it helps.
Use below code snippet :
//Add button to NavigationController
UIBarButtonItem *backButton =
[[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(#“back”, #"")
style:UIBarButtonItemStylePlain
target:self
action:#selector(goBack)];
self.navigationItem.leftBarButtonItem = backButton;
//Perform action on back Button
- (void) goBack { // Go back task over-here
}
Different style types available are :
UIBarButtonItemStylePlain, UIBarButtonItemStyleBordered, UIBarButtonItemStyleDone
You may use this setters without creation new UIBarButtonItem:
[self.navigationItem.leftBarButtonItem setAction:#selector(doBackButton:)];
[self.navigationItem.leftBarButtonItem setTarget:self];