I've got a UIView with a NavigationBar and I'd like to add a button which looks like the style of a Back Button. I'm not using a UINavigationController and was wondering if this could be done without it?
The style of the button should look like this:
Thanks
You need to set up a custom stack of UINavigationItem objects and push them on to the UINavigationBar. This is the only way I know of to get a true back button. I haven't tested this code, but you should do something like this:
UINavigationItem *previousItem =
[[[UINavigationItem alloc] initWithTitle:#"Back title"] autorelease];
UINavigationItem *currentItem =
[[[UINavigationItem alloc] initWithTitle:#"Main Title"] autorelease];
[navigationBar setItems:[NSArray arrayWithObjects:previousItem, currentItem, nil]
animated:YES];
To handle when the buttons are pressed you should set yourself as the navigation bar's delegate and implement the UINavigationBarDelegate delegates.
You can also update this by modifying the backBarButtonItem on the previous view controller (not the currently viewed one).
Related
I'm using the following code to try to make a "back" button for my app, the view that this code is located is in a modal view (if that has any bearing?):
navBar = [[UINavigationController alloc] initWithRootViewController:tvController];
[navBar.view setFrame:CGRectMake(0, 0, 320, 460)];
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle: #"Back"
style: self.navigationController.navigationItem.leftBarButtonItem.style
target: self
action: #selector(backAction)];
navBar.navigationItem.backBarButtonItem.enabled = YES;
[self.view addSubview:navBar.view];
The view does not show at all, thank you for any tips!
EDIT: Even if I use a leftBarButtonItem, it still does not show up, I think there is some problem with the self.navigationItem bit of my code?
You need to make sure that when you present the modal view that you wrap it in a UINavigationController, then you'll have a valid navigation bar to manipulate. Otherwise you'll change the navigationItem all you want but it won't show up because you're not in a navigationController.
So when you go to present the view controller you're probably doing something like this.
SomeViewController *someViewController = [[[SomeViewController alloc] init] autorelease];
[self presentModalViewController:someViewController animated:YES];
What you want to do is present it like this
SomeViewController *someViewController = [[[SomeViewController alloc] init] autorelease];
UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:someViewController] autorelease]
[self presentModalViewController:navigationController animated:YES];
Then when you're in the modal view you'll have a valid navigation bar that you can manipulate. Altering the leftBarButtonItem at that point will actually do something and be visible.
If you're trying to make this show a back button though you're probably "doing it wrong" typically if you're presenting something modally like this you'd show a "done" button. However by wrapping this with a navigation controller like this it does allow the modal view to then push and pop view controllers and operate as a normal navigation stack. But the root of it should probably have a "done" button not a back to return back to its previous state.
The backBarButtonItem property needs to be defined on the previous item in your stack, i.e. on the view controller you are going back to, not the current one.
EDIT:
OK, I see now you are adding your own custom navigation bar. In that case, you cannot use the view controller's navigation item. You must instead push your own navigation items on to the navigation bar and access those instead. For example:
UINavigationItem *item = [[UINavigationItem alloc] initWithTitle:#"Back"];
item.leftBarButtonItem = ...;
[navBar pushNavigationItem:item animated:NO];
I've a UINavigationController and in the picture you can see a UIViewController added to it.
Now, I would like to customize the top bar of the UINavigationController with the content of the current visible UIViewController. More in particular, I would like:
add the title
customize "back" button text
Should I use self.navigationController method from the current UINavigationController ? If so, what are the next steps ?
Thanks
You can set the Title with:
[[self navigationItem] setTitle:#"title text"];
You can change the backbuttontext in the InterfaceBuilder or:
[[[self navigationItem] backBarButtonItem] setTitle:#"back button text"];
But remember that the backBarButtonItem comes from the previous ViewController so you have to set it there. Alternatively the title is set from the previous view.
self.title = "Your title";
You can use this in the current view controller for displaying title
I am trying to show the UIToolBar in the RootView of a UISplitView application, the code is the following:
self.navigationController.toolbarHidden = NO;
UIBarButtonItem *refreshItem = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
target:self
action:#selector(refresh:)];
self.toolbarItems = [NSArray arrayWithObjects:refreshItem, nil];
[refreshItem release];
However, what I see is:
There's black bar on top (I don't know where this came from, I don't need this) also the bar at the bottom, is there a way to resize it?
What I want is to get something like this:
Using something like this you can add a bar button item to the top of the controller:
UIBarButtonItem *refreshItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:#selector(refresh:)];
self.navigationItem.leftBarButtonItem = refreshItem;
[refreshItem release];
You will make the button appear in the main view controller's title bar, as it's meant to be.
If you want to make the button appear in the bottom of the navigation controller you could try using this approach, instead:
UIBarButtonItem *refreshItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:#selector(refresh:)];
[self setToolbarItems:[NSArray arrayWithObjects:refreshItem, nil animated:YES]];
[self.navigationController setToolbarHidden:NO]; //optional, don't remember if it's required ...
[refreshItem release];
For this piece of code to work correctly the side controller has to be a UINavigationController, otherwise you wouldn't be able to create and handle the toolbar. I tried this approach in a clean project and the toolbar renders perfectly.
I had the same issue and Just fixed it, Due to moving the code out of the Viewdid Load to lower down the Page,
As I had previous put in
- (UIBarButtonItem *)barButtonItem {
Moving the Code You used to under that, Worked and fixed the issue
Stewart
Just a note for anybody else who stumbles upon this question. I was having the same issue as adit. The problem turned out to be I was setting up and unhiding the toolbar in the viewDidLoad method instead of the viewWillAppear method. Those gaps are caused by setting up the toolbar before the view knows it's being displayed in landscape mode.
The safest and easiest solution is to setup the UINavigationController to display the toolbar and navigation bar in Interface Builder.
If it looks as expected in IB, it is very unlikely it will change at run-time.
If the toolbar is to be shown/hidden when navigating you should add the cod to do so in viewWillAppear: and allways call the super implementation, or unexpected things may occurs. Something like this tends to give the best results in a consistent manner:
-(void)viewWillAppear:(BOOL)animated;
{
[super viewWillApplear:animated];
[self.navigationController setToolbarHidden:NO
animated:animated];
}
Also make sure to show/hide the toolbar as need in viewWillAppear: for all view controllers in your navigation stack for best result.
In my iPhone application I want to make a page/view where the user can add notes.. essentially write something and then save it...
similar to what the Notes app offers on the iPhone... but at a basic level...
I was thinking of something simple like a tableview with a "+" button on the navigation bar that lets the user add a note.
I have googled every possible thing I could think of.. :(
Could someone show me how I would go about implementing this in my view controller?
(I know it seems very simple but I'm new to programming for the iPhone - hence why I'm struggling...)
You will want to add a barbuttonitem to the navigation bar and set the action to method that launches your Note viewController with a new note. The easiest way to do all that is to use Interface Builder to add the button and hook up the action to a custom method that looks something like this:
- IBAction newButtonPressed:(id)sender
{
NoteViewController *noteVC = [[NoteViewController alloc] initWithNibName:#"NoteViewController" bundle:nil];
[self presentModalViewController:noteVC animated:YES];
[noteVC release];
}
If you want to add the BarButtonItem from code you can do this in your viewDidLoad method:
UIBarButtonItem *newButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:#selector(newButtonPressed:)];
self.navigationItem.rightBarButtonItem = newButton;
[newButton release];
Note - the above code assumes your View Controller is called NoteViewController and has a Nib called NoteViewController, if you are doing some other form of initialization, then do it there, the important code is the presentModalViewController.
If instead of the modalview approach, you would like a more navigation like entrance (with back button functionality, etc.) you can use the following method instead:
- IBAction newButtonPressed:(id)sender
{
NoteViewController *noteVC = [[NoteViewController alloc] initWithNibName:#"NoteViewController" bundle:nil];
[self.navigationController pushViewController:noteVC animated:YES];
[noteVC release];
}
I know that it could seem strange but i need to add a back button on the navigation Bar of the first navigationController's view. I tried like this:
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:#"Foo" style:UIBarButtonItemStyleBordered target:self action:#selector(foo:)];
self.navigationItem.backBarButtonItem=backButton;
if instead of backBarButtonItem i write leftBarButtonItem the button is showed. My problem is that i need an arrow button as the normal back button. Is this possible?
Usually this works out of the box, but sometimes with modal views / action sheets you may need this. Just before you instantiate your viewcontroller and push it onto navigationcontroller stack, try
UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle: #"Back" style: UIBarButtonItemStyleBordered target: nil action: nil];
[[self navigationItem] setBackBarButtonItem: newBackButton];
[newBackButton release];
DetailViewController *detailVC = [[DetailViewController alloc]init];
[self.navigationController pushViewController:detailVC animated:YES];
[detailVC release];
I don't think you can do that on the first NavigationController view, because you need to set the backBarButtonItem property in the parent controller, before the child controller is pushed. Also, according the to the Apple docs, the target & action of the backBarButtonItem must be nil.
This question about creating a left-arrow button on a UIToolbar may give you some ideas of how you could work around this using a custom image (for the leftBarButtonItem).
or you could also do the following - I prefer this method. I got this from a different post.
Use following psd that I derived from http://www.teehanlax.com/blog/?p=447
http://www.chrisandtennille.com/pictures/backbutton.psd
Then I just create a custom UIView that I use in the customView property of the toolbar item.
Works well for me.
Hope that helps a little
Of course you can do this. You just need to change the leftBarButtonItem's title to back
then you will get a nice left arrow button with the title back. Then you just change the selector to actually perform a method when the button is clicked. So #selector(foo:)
Here some code on how to achieve the above:
self.navigationItem.leftBarButtonItem.style = UIBarButtonItemStyleDone;
self.navigationItem.leftBarButtonItem.title = #"Back";
self.navigationItem.leftBarButtonItem.target = self;
self.navigationItem.leftBarButtonItem.action = #selector(endTextEnteringButtonAction:);
Let me know if that helps.
Apple Document says:
When this navigation item is immediately below the top item in the stack, the navigation controller derives the back button for the navigation bar from this navigation item.
So If your navigation item is the top of the Stack (as we are talking here) you can't add the back button to the navigation controller, simply because no place he can navigate back to it because it's the top item in the stack.
Updated Answer :
After I searched I found work a round to make a back button in your root view controller in Navigation controller in these link
It's very simple :)
[self.navigationItem setHidesBackButton:YES animated:YES];
UIBarButtonItem* backButton = [[UIBarButtonItem alloc] initWithTitle:#"Start" style:UIBarButtonItemStyleBordered target:self action:#selector(initializeStuff)];
self.navigationItem.leftBarButtonItem = backButton;