I've tried hiding the thing, but it just appears greyed out in UINavigationController
I found a delete method, but it asks to pass in Anyobject..
Button.delete(AnyObject?)
You can remove the UIBarButtonItem. It's just one type of deallocating the item:
self.navigationItem.rightBarButtonItem = nil
self.navigationItem.leftBarButtonItem = nil
Related
I am converting an app that is written in ios 2 to ios 9. I am not really familiar with ios 2 and I need some help. Back in ios 2 there were no view controllers and xib files were used. There was one xib file called the main window which would hold all the navigation items. In my case the main window xib has a navigation bar. And in code there is the following line
self.navigationItem.title = #"Back";
So I could see when i run the app on a simulator, in one of my views there is a button with titled "Back". But i cannot find a method for this button. Like there is no IBAction for it or a method. I am trying to add a selector for the navigationitem but it doesn't work. This is what I tried:
self.navigationItem.selector = #selector(backButtonClicked:)
How can I add a selector to a navigationItem so I can search that in the project or create my own selector.
You can add custom back button to your navigation bar this way
UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStyleBordered target:self action:#selector(backButtonClicked:)];
self.navigationItem.leftBarButtonItem = btn;
-(void)backButtonClicked: (id)sender
{
[self.navigationController popViewControllerAnimated: YES]; // or popToRoot... if required.
}
I am trying to add a bar button to my iOS app and can't get it to show up. I can see the bar in the Navigation Item's view hierarchy by setting a breakpoint. If it helps, I chose 'Embed Navigation Controller'. Any idea what's going on?
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:#selector(choosePreferredTerm:)];
[self.navItem setRightBarButtonItem:item animated:YES];
Here is the connection in IB
This is what the embedded Navigation Controller looks like:
This is what it looks like on the sim:
Try this rather than using custom outlet "navItem" also insure your application has a navigation controller in place
self.navigationItem.rightBarButtonItem = barButton;
I need to make a button reappear after I set it to nil but I can't seem to figure it out.
I set it to nil using:
self.navigationItem.rightBarButtonItem =nil;
When you set the button to nil you destroy (deallocate) it. Just recreate the button. Or, if it's expensive to create for some reason, create another property which holds the button and then use that to restore the rightBarButtonItem.
It's a requirement to set the button to nil? Another approach is to set the button's background alpha to 0, or disable it with setEnabled:NO. If it's a requirement, you have two options:
Store the button as a property and assign the button to the rightBarButtonItem of the navigationItem. Make sure you do all button manipulation to the property.
Create a method to create an instance of UINavigationItem with the button and assign this button to rightBarButtonItem. By the way, if you want to have exactly the same instance you had in the nil assignment, you must use the first option.
Hope it helps!
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(done)];
[self.navigationItem setRightBarButtonItem:doneButton animated:YES]
Hide the button by setting the reference to nil, however if you want to restore it later, you'll need to hang onto a copy of it so you can reassign it.
UIBarButtonItem *oldButton = self.navigationItem.rightBarButtonItem;
[oldButton retain];
self.navigationItem.rightBarButtonItem = nil;
//... later
self.navigationItem.rightBarButtonItem = oldButton;
[oldButton release];
Or create a property of the barbuttonitem and just pass it whenever you need it.
#property (nonatomic, retain) UIBarButtonItem *rightNavButton;
self.navigationItem.rightBarButtonItem = self.rightNavButton;
How I hide the rightBarButtonItem of a navigation controller when I want to navigate from tab-bar instead of Navigation Controller.
To Hide the right button:
self.navigationItem.rightBarButtonItem = nil;
And to show it:
If you setup the right button in your view controller by assigning it to self.editButtonItem then simply assign it again in order to show it:
self.navigationItem.rightBarButtonItem = self.editButtonItem;
Just write this line in viewDidLoad or viewWillAppear of the class in which you want to hide the right bar button
self.navigationItem.rightBarButtonItem = nil;
I have a Navigation Bar in a view, and I want to change its Navigation Item title programmatically.
How is this done?
In your UIViewController
self.navigationItem.title = #"The title";
Swift 3 Version:
If you use a navigation bar without navigation controller, then you can try this:
navigationBar.topItem?.title = "Your Title"
Hope for help.
In viewDidLoad
self.title = #"Title";
Write the below code in viewDidLoad or may be better would be under initWithNibName:
self.navigationItem.title = #"title";
Thanks.
From Apple Documentation:
The most common way to use a navigation bar is with a navigation
controller. You can also use a navigation bar as a standalone object
in your app.
So If you have a UINavigationController, all what you have to do to set the title of the navigation bar (as explained in all previous answers)
self.navigationItem.title = #"title";
But If you have a standalone navigation bar that is created programmatically within an object of UIViewController, You have to set the initial appearance of the navigation bar by creating the appropriate UINavigationItem objects and adding them to the navigation bar object stack i.e.
Create an instance of navigation bar (UINavigationBar)
Create an instance of navigation bar item (UINavigationItem) that manages the buttons and views to be displayed in a UINavigationBar object. Note that you set the title at this step.
(Optional Step) Add right/left buttons (instances of UIBarButtonItem) to the navigation bar item.
Sample of Objective-C Code for the mentioned steps:
UINavigationBar* navbar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 64)];
/* Create navigation item object & set the title of navigation bar. */
UINavigationItem* navItem = [[UINavigationItem alloc] initWithTitle:self.shoppingItem.name];
/* Create left button item. */
UIBarButtonItem* cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:#selector(onTapCancel:)];
navItem.leftBarButtonItem = cancelBtn;
/* Create left button item. */
UIBarButtonItem* doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(onTapDone:)];
navItem.rightBarButtonItem = doneBtn;
/* Assign the navigation item to the navigation bar.*/
[navbar setItems:#[navItem]];
/* add navigation bar to the root view.*/
[self.view addSubview:navbar];
For Swift version of the standalone navigation bar, check out this answer.
You can also use 👇🏻
[self.navigationController.navigationBar.topItem setTitle:#"Titlet"];
In your UIViewController's viewDidLoad
self.navigationItem.title = "The title"; //In swift 4
or
you can just
self.title = "The title"
will do the trick
you can also put the above statement in the app delegate to replicate globally.
This code did not work for me
self.navigationItem.title = #"Title here";
But this worked.
self.title = "Title Name"
Use it in ViewDidLoad method
Format :
#property(nonatomic,readonly,retain) UINavigationItem *navigationItem; // Created on-demand so that a view controller may customize its navigation appearance.
Example :
self.navigationItem.title = #"Title here";
very important note : make sure you make the changes that mentioned above in parent view Controller's viewDidLoad method, or parents navigation bar in storyboard
Sometimes you might get a case where you are updating the title and it is not causing any effect, this can be when you have a custom view on the topItem therefore you might want to update it like this: (self.navigationController?.navigationBar.topItem?.titleView as? UILabel)?.text = "My Happy New Title"