I have a reference of UIViewController. From that reference i want to get references to all my navigation bar and bar button items and apply custom styles on them.
How can i achieve this on iOS 5?
You can do something like that.
[backbutton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor blackColor],UITextAttributeTextColor,[UIFont fontWithName:TEXTFONT size:16.0f],UITextAttributeFont,
nil] forState:UIControlStateNormal];
Assuming your view controller has a navigation controller, you should be able to access the navigation bar and its items using the following code:
UINavigationBar *navBar = [myViewController.navigationController.navigationBar];
NSArray *navBarItems = navBar.items;
Related
The Initial View Controller of this project is a Navigation Controller. I want to show a Tab Bar Controller on a View Controller later in the view hierarchy after the user signs in.
When I embed a Tab Bar Controller on the View Controller I want it to be on, the navigationBar I have programmatically implemented gets overridden with a new navigationBar item that, when pressed, leads the user back to the log in page.
Here is the code for the navigationBar.
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
//Changes The Title Color
[self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName]];
//Sets The Navigation Controller Font
[self.navigationController.navigationBar setTitleTextAttributes:
[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor whiteColor], NSForegroundColorAttributeName,
[UIFont fontWithName:#"ArialMT" size:12.0], NSFontAttributeName,nil]];
[[UINavigationBar appearance] setBarTintColor:UIColorFromRGB(0x0080ff)];
self.navigationController.navigationBar.translucent = YES;
self.navigationItem.leftBarButtonItem = btnRefresh;
//
self.navigationItem.rightBarButtonItem = btnCompose;
Here is how the navigationBar is supposed to be implemented on the View Controller:
Here is what happens when a Tab Bar Controller in embedded in the View Controller that I want it to be on:
What is the correct way to show a Tab Bar Controller on this View Controller that will preserve the existing navigationBar? Apple's Documentation on Tab Bar Controllers seems extensive and it seems it should be implemented programmatically.
According to Apple docs TabBarController should not be pushed to UINavigationController. Instead you can just use UITabBar and UITabBarDelegate to get same effect. You can refer below link of documentation.
https://developer.apple.com/documentation/uikit/uinavigationcontroller/1621887-pushviewcontroller
I think my title is what i am looking for. So, i have a tab bar with 4 view controllers. I started to configure my app within storyboard and i configured my tab bar controller from there. I, also, have declared the names of the view controllers in my appdelegate file. My question is the following. Can i add a button in the middle of my tab bar controller? I searched a lot about that and i didn't find a complete solution. Can i use storyboard to connect my view controllers to the tab bar and also app delegate to declare that button to the center of tab bar? Please help. This is my code so far in app delegate file (anything else is in storyboard, juts the view controllers connected to tabbarcontroller) :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
Assign tab bar item with titles
UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
tabBarController.selectedIndex = 1;
UITabBar *tabBar = tabBarController.tabBar;
UITabBarItem *tabBarItem1 = [tabBar.items objectAtIndex:0];
UITabBarItem *tabBarItem2 = [tabBar.items objectAtIndex:1];
UITabBarItem *tabBarItem3 = [tabBar.items objectAtIndex:3];
UITabBarItem *tabBarItem4 = [tabBar.items objectAtIndex:4];
tabBarItem1.title = #"Tab1";
tabBarItem2.title = #"Tab2";
tabBarItem3.title = #"Tab3";
tabBarItem4.title = #"Tab4";
[tabBarItem2 setFinishedSelectedImage:[UIImage imageNamed:#"maps_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:#"maps.png"]];
// Change the tab bar background
UIImage* tabBarBackground = [UIImage imageNamed:#"TAPBARBGR.png"];
[[UITabBar appearance] setBackgroundImage:tabBarBackground];
[[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:#"tabbar_selected.png"]];
// Change the title color of tab bar items
[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor whiteColor], UITextAttributeTextColor,
nil] forState:UIControlStateNormal];
UIColor *titleHighlightedColor = [UIColor colorWithRed:153/255.0 green:192/255.0 blue:48/255.0 alpha:1.0];
[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
titleHighlightedColor, UITextAttributeTextColor,
nil] forState:UIControlStateHighlighted];
return YES;
}
Thank you.
If you connect 4 pages to the standard UITabbarController it will layout 4 buttons equally dividing the space between them. You don't have any control how they are laid down. You can rearrange them in the storyboard or in the code but with 4 buttons - no button will be in the middle.
You can add 5th button and rearrange it to the 3rd position, so this one will be in the middle of tabbar. Or you can look for 3rd party custom tabbar implementations - there are bunch of them on gitnub and other places. Some of them would have specific middle page that styled differently from others.
Can i add a button in the middle of my tab bar controller?
No.
Assuming that you mean adding a button different from the other tab bar items, then no, UITabBar doesn't provide for this. As explained in the UITabBar documentation, all items in a tab bar are expected to be tab bar items, but you could consider a UIToolbar instead:
Each button in a tab bar is called a tab bar item and is an instance
of the UITabBarItem class. If you instead want to give the user a bar
of buttons that each perform an action, use a UIToolbar object.
From a user experience point of view (IMO) it's probably not a good plan to try to mix tab bar and tool bar functionality.
Note, I've recently come back to this and it seems to have been fixed in more recent versions of the SDK, without me having to implement anything except the code in the question. Many thanks to all who answered.
I have an Objective-C app that runs on the iPad and displays a view controller with a modal presentation style of UIModalPresentationPageSheet:
UINavigationController *editorNavigationController = [[UINavigationController alloc] initWithRootViewController:editorViewController];
editorNavigationController.modalPresentationStyle = UIModalPresentationPageSheet;
[navigationController presentViewController:editorNavigationController animated:YES completion:nil];
When this view controller is displayed the buttons in the navigation bar are purple, which I assume has been picked up from the window's tint colour, which is what I want.
Later I need to display another view controller over the top, that fills the whole window:
UINavigationController *previewNavigationController = [[UINavigationController alloc]initWithRootViewController:myPreviewViewController];
[owningViewController presentViewController:previewNavigationController animated:YES completion:nil];
The problem I have is that when myPreviewController is displayed, the buttons in the navigation bar are grey. I've tried reinstating the colour on the new navigation controller:
previewNavigationController.navigationBar.tintColor = [UIColor colorWithRed:123/255.0 green:26/255.0 blue:69/255.0 alpha:1];
but without any joy.
How can I get the buttons to have the correct colour? Can I get the new navigation controller to pick up the window tint colour automatically, or do I have to set it explicitly? Is this something to do with presenting the second navigation controller over the top of one that uses UIModalPresentationPageSheet?
Any help much appreciated! Thanks,
Paul
You can set the navigationBar translucent and transparent.
In view Will Appear:
self.navigationController.navigationBar.translucent = NO;
Than create a UIView with frame size of navigationBar (CGRectMake(0,0,self.view.frame.size.height,22) and create buttons on it with color you need.
I know, thats a crutch but should work)
You can change the appearance of the UIBarButtonItem globally so all UINavigationControllers will share the same design:
[[UIBarButtonItem appearance] setTintColor:[UIColor purpleColor]];
[[UIBarButtonItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
[UIFont fontWithName:#"fontName" size:16.0f],NSFontAttributeName,
nil] forState:UIControlStateNormal];
Additionally you could also change the [UINavigationBar appearance]:
//The setTintColor would tint the < Back button in the NavigationBar
[[UINavigationBar appearance] setTintColor:[UIColor greenColor]];
[[UINavigationBar appearance] setBarTintColor:[UIColor redColor]];
[[UINavigationBar appearance] setTitleTextAttributes:
#{NSForegroundColorAttributeName:[UIColor blueColor]}];
This code can be add it before presenting the UIViewControllers or simply in the AppDelegate.m.
Earlier I used a navigationcontroller with this code :
self.navigationItem.title = #"News";
Now I have the problem that I no longer needed the navigationcontroller as I am using a page controller for navigation. Now I added a navigationbar however it doesn't change the title with this code anymore.
Also how can I change the background color?
IN iOS 7 use write following code in didFinishLaunchingWithOptions
if ([[UINavigationBar class] respondsToSelector:#selector(appearance)])
{
[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed: 4.0/255.0 green:173.0/255.0 blue:214.0/255.0 alpha:1.0f ]]; //// change background color of navigationBar
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]]; /// set backButton color of navigation bar
[[UINavigationBar appearance] setTitleTextAttributes:#{NSForegroundColorAttributeName : [UIColor whiteColor]}]; // set title color
[[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], UITextAttributeTextColor,nil] forState:UIControlStateNormal]; /// set all barButton item color
self.navController.navigationBar.translucent = NO;// set translucent NO
}
Use as per your requirement.
So there is some magic happening when you use a navigation controller that you don't see and now that you've made the switch to justing using a navigation bar you lose that magic.
Navigation bars are responsible for managing and presenting UNavigationItems, and as such hold an array of them. A NavigationItem holds things like left and right buttons, and the title or titleView. When your navigation controller pushes a new controller, it creates a brand new UINavigation item then links it to your new view controller, and then pushes that onto navigation bars stack of nav items. That's why from within your view controller you set the title with self.navigationItem.title instead of referencing the navbar.
Basically you have to manage the bar and nav items yourself now. This should about do it for you:
_navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, yOffset, CGRectGetHeight(size), height)];
_navItem = [[UINavigationItem alloc] initWithTitle:#"My navbar title"];
[_navBar setItems:#[_navItem]];
[self.view addSubview:_navBar];
Of course you'll have to manage the size a bit differently as my example comes from an app where it's being used in landscape mode.
I am using a cocoa iOS component from cocoacontrols.com, which is NOT using storyboards. This class creates a new modal view and the modal view has a NavigationBar at the top. I am trying to get the color of the navigationBar to change. In all my other views, which are storyboard based, I use a base class of STBaseViewController which sets the navigationBar as white.
I have changed this cocoacontrol class to be a STBaseViewController instead of a UIViewController, but it still is not changing my background to white.
#interface BZPasscodeFieldController : STBaseViewController
In the BZPasscodeFieldController, which they don't make any reference to a navigationbar, so I am not sure how its even showing up (again it has no storyboard's only xibs and they don't have navigationbars)?
Anyway, does anyone know how to make the navigationbar background color white programatically?
Further, in all my storyboard viewControllers that have a UINavigationBar, I have added a UIButton over the area where the title goes, so that I can easily change the font/style and also make it clickable. I need to add this same UIButton to the uinavigationBar of this BZPasscodeFieldController created programatically. How would I go about doing that?
To Set Navigationbar Background Color:
[[UINavigationBar appearance] setBarTintColor:[UIColor orangeColor]];
To set Navigationbar Tint Color:
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
For your question about the button on the place of title of navigationBar. Each navigationBar has a titleView property, you can assign any view to it. For example take a look at this method, you can call it in your BZPasscodeFieldController:
- (void) setNavigationBarTitleButton
{
UIButton* centralButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 40, 44)];
[centralButton setImage:navigationCentralButtonImage forState:UIControlStateNormal];
[centralButton setShowsTouchWhenHighlighted:TRUE];
[centralButton addTarget:self action:#selector(goHigher) forControlEvents:UIControlEventTouchDown];
self.navigationItem.titleView = centralButton;
}
For your previous question the answers provided already are all correct, calling them in the right place(for example in AppDelegate's application:didFinishLaunchingWithOptions: should make it work well, unless something is messed up in your custom view controller classes.
[[UINavigationBar appearance] setTintColor:[UIColor blueColor]];
[self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];