I have a tabbed application written in Objective-C with 3 tabs and I want to add an additional tab that will call a UIAlertController.
However, all tutorials explaining how to add additional tabs to Tab Bar always do so using storyboard, where you first add a viewcontroller and then a segue.
I just want to add a tab bar button and then call the UIAlertController when that button is pressed. Any ideas on how to do this?
I tried adding the code
UIImage* anImage = [UIImage imageNamed:#"beaker.png"];
UITabBarItem* theItem = [[UITabBarItem alloc] initWithTitle:#"Home" image:anImage tag:3];
to the viewDidLoad of my TabBarController, but it did not work.
Any suggestions would be greatly appreciated!
Related
Im using the following code to customize tabbar.
- (void)viewDidLoad {
[super viewDidLoad];
// The following line centres the UITabBarItem.
[UITabBarItem appearance].titlePositionAdjustment = UIOffsetMake(20, -20);
//the following line make the tabbaritem button with tag 4 to appear as more button
self.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemMore tag:4];
}
But the problem is that, the more button is not being shown for the tabbaritem with tag 4. I have five tabs and I want to show more button after three tabs. Whats wrong with my code?
You do not have to manually create a "More..." button.
Simply add all of the View Controllers that you need to the Tab Bar Controller and it will handle the rest.
If you want to create then one of the solution is,
You could make your own More tab and then have it display a navigation controller and table view with the other options.
do it like following way:
You can set the last bar button as a "More" button even when there are only 4 tabs. The initialization code for that tab bar item would be:
self.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemMore tag:0];
I hope this will work perfectly..:)
My app is navigated by a slide out menu from the left. On top of each viewController is a left UIBarButton titled "Navigation", that when touched, opens the slide out menu without having to do the drag effect. I am implementing speech commands into my app, and if a user speaks "Go to Finances", it segues to a viewController titled FianceViewController through instantiateViewController to pushViewController.
This all works fine, the only problem is the back button associated with push segue covers up my "Navigation" button in the left slot of the UINavigationBar. Using self.navigationItem.hidesBackButton = YES; hides both the back button and my "Navigation" button. Is there anyway not make a back button appear when the push happens, but still allow my previously created "Navigation" bar button to be seen and used? Or is there another type of segue that I can do other than push if this UIBarButton dilemma cannot be solved?
Section of code that segues when spoken:
if ([title isEqualToString:#"FINANCES"])
{
FinanceViewController *fvc = [[self storyboard] instantiateViewControllerWithIdentifier:#"finance"];
[[self navigationController] pushViewController:fvc animated:YES];
}
How are you adding the navigation button?
I would try to add it after hiding the back button, something like this:
self.navigationItem.hidesBackButton = YES;
UIButton *navigationButton = [[UIButton alloc] initWithFrame:CGRectMake(15.0, 15.0, 100.0, 32.0)];
self.navigationController.navigationBar.backItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:navigationButton];
Instead of hiding my back button, I figured out I could simply write over it! Using fvc.navigationItem.leftBarButtonItem = self.navigationItem.leftBarButtonItem; before pushViewController, allows the "navigation" button to override the back button.
I have an app that uses bottom tabs aswell as a side menu, to have the button that initiates the side menu i use the typical three line menu button, to put that there I have a Navigation Bar. With the bar in place there is no way I can get the bar to be on top of the screen. I built it with interface builder, and heres a screenshot. The question is how do i have the navigation bar alone without the other grey bar above it?
The issue you're encountering is due to the fact that you're manually creating a navigation bar for your view controller, instead of using the bar that you get for free by embedding the view controller in a tab bar controller, hence the reason you see two bars. The other answer suggesting hiding the auto-generated navigation bar is not the correct solution. Instead, you should place your menu button and view title in the auto-generated bar instead of manually creating your own (you almost never want to do that, in-fact).
So what you should do instead is set the title property of your view controller to be "News", and the leftBarButtonItem property of the view controller to be your hamburger menu button (an instance of UIBarButtonItem initialized with an image for the icon).
For example (inside your view controller's viewDidLoad method or wherever appropriate):
self.title = #"News";
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"menuIcon"] style:UIBarButtonItemStylePlain target:self action:#selector(showSideMenu)];
If you want to remove the topmost navigation bar you need use self.navigationController.navigationBarHidden = YES; for view controllers that used for tabs in UITabBarController:
// StoriesViewController.m
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.navigationController.navigationBarHidden = YES;
}
I have following view controllers hierarchy:
View Controller VC1
Tab Bar Controller TBC1 - configured in storyboard to lead to a Table View Controller TVC1 and a Map View Controller MVC1
Table View Controller TVC1
Table View Controller TVC2
In VC1, I do this:
[self.navigationController pushViewController:TBC1 animated:YES];
This rightly brings up tab bar controller, with TVC1 in focus.
TVC1 shows back button in its navigation bar (programmatically created from VC1 code), which will get me to VC1, which is expected.
However, from TVC1 onwards, I need one more navigation to TVC2. I am trying to add right button to the TVC1 navigation bar for this, but it doesn't show up.
Here is the code I use in TVC1 (rightButton is UIButton type property of TVC1):
self.rightButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem: UIBarButtonSystemItemAdd
target: self
action: #selector(MySelector:)];
self.rightButton.style = UIBarButtonItemStyleBordered;
self.rightButton.title = #"";
self.navigationItem.rightBarButtonItems = [NSArray arrayWithObjects: self.rightButton, nil];
(specified blank title and style just to ensure if that's the issue which is causing this, I don't actually need those values)
MySelector is declared in TVC1.h as:
- (void) MySelector:(id)sender;
And it is properly implemented, too.
But rightButton above does not display in TVC1 navigation bar.
What am I missing?
I suspect its with TBC1 (tab bar) that comes between VC1 and TVC1, and somehow it resets navigation properties.
But then I argue that I see navigation bar on TVC1, and a left button leading to VC1.
I checked that in TBC1, self.navigationItem.rightBarButtonItems has 1 object inside which is definitely the rightButton I am adding.
Where am I wrong?
Note: Above is found in all of iOS 5.0, 5.1 and 6.0 simulators.
It seems to me that your are missing UINavigationController between TVC1 and TVC2 in your storyboard. If you are using storyboards then you can create navigation item Add button type on the navigation controller itself and have a PUSH segue to TVC2. See this diagram if that makes sense. If this doesn't solve your problem then please upload example code and I will have a look.
[EDIT]
I had reproduced your issue by creating your view controllers structure in storyboard.
If you notice here TVC1 doesn't have it's UINavigationController but it is inheriting it from VC1. Solution to your problem is rather than adding rightButton onto self add it to self.parentViewController and you will see rightButton in TVC1. But mind you it will also appear in MVC1 as it is belong to TBC1's parent. You can hide right bar button in MVC1's viewWillAppear if you don't want it there. Following is the code.
self.rightButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem: UIBarButtonSystemItemAdd
target: self
action: #selector(MySelector:)];
self.rightButton.style = UIBarButtonItemStyleBordered;
self.parentViewController.navigationItem.rightBarButtonItems = [NSArray arrayWithObjects: self.rightButton,nil];
If you want to Add right button into the TVC1's navigation controller then you need Embed TVC1 into UINavigationController. To do this, select TVC1 screen in the storyboard -> Editor -> Embed In->Navigation Controller. When you do this your code will also work and will show you right button but you will have two navigation controllers(see image below) in it because of your structure of storyboard. You will need to hide Parent's navigation controller in to the TVC1's view did load and have left button to Pop to Parentview Controller. You do the same in MVC1.
Hope this helps! Happy coding :)
Had the same problem recently in Swift and found that embedding the child view in a navigationController was still the correct way to be able to access the rightBarButtonItems.
I'm not using a navigation controller so I'm just getting a plain rounded rect. I want to get the arrow-esque back button instead, is that possible?
From your comments, you would like to use a navigation controller but don't have room for the navigation bar on your root view controller.
self.navigationController.navigationBarHidden
Will hide or show the navigation bar within a view controller. That should make your life simpler.
It is rather simple, create your custom back button like so:
UIButton *button = /* your custom button, most likely with an image */
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
[self.navigationItem setRightBarButtonItem:barButtonItem];