I have an iPhone application with 2 tabs. This is my application delegate:
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
// Add the tab bar controller's current view as a subview of the window
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
My first tab is a subclass of UITableViewController. I would like to push a new view controller when someone clicks on a row of my table. I know that this is done in didSelectRowAtIndexPath like this:
TableViewDetailViewController *fvController = [[TableViewDetailViewController alloc] initWithNibName:#"TableViewDetailViewController" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:fvController animated:YES];
[fvController release];
fvController = nil;
My self.navigationController is NIL so nothing gets pushed to the view stack. Where should I create my navigationController, so there would be as little code to change as possible?
We have direct solution using Interface builder.
In interface builder go to xib in which you have added tabBarController and delete the tabBarItem with which you have connected your tableViewController .
Now, drag and drop an UINavigationController from library in your tabBar and set this navigationController's rootViewController as your tableViewController.
Thanks
Instead of setting your TableViewDetailViewController as one of your tabbbars ViewControllers, you should create an UINavigationController for each tab on your tabbar. Then place your TableViewDetailViewController inside the corresponding UINavigationController. self.navigationController will point to a valid UINavigationController in that case.
Related
Basically when i start my application I show tab view controller, and it shows first tab, and loads only first tab. I would like at the same time to preload rest of the view controllers. I have found this post - Load All TabBar Views
But I am getting error. I call [subcontroller view] in viewDidLoad method of tab bar controller. I am using storyboard. The problem is that I am getting error - Could not load NIB in bundle: 'NSBundle'
What am i missing?
EDIT:
I will try to be more concise - Tabbar has 4 view controllers, corresponding to 4 different tabs. When user presses tab, corresponding view controller is loaded. When you first launch the app, only the first view controller is loaded. Other view controllers are not loaded, they are loaded after user taps their tabs. I want all those controllers to load to memory so i can do something with them (they are not shown on screen).
// load all view controller in appdelegate.h file in project
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
ViewController1 *view1=[[ViewController1 alloc]initWithNibName:nil bundle:nil ];
view1.tabBarItem.image = [UIImage imageNamed:#"1.jpg"];
UINavigationController *navi1=[[UINavigationController alloc]initWithRootViewController:view1];
ViewController2 *view2=[[ViewController2 alloc]initWithNibName:nil bundle:nil ];
view1.tabBarItem.image = [UIImage imageNamed:#"1.jpg"];
UINavigationController *navi2=[[UINavigationController alloc]initWithRootViewController:view2];
NSArray *navi= [[NSArray alloc]initWithObjects:navi1,navi2,navi3,navi4,nil];
UITabBarController * bar=[[UITabBarController alloc]init];
NSArray *navi= [[NSArray alloc]initWithObjects:view1,view2,nil];
bar.viewControllers=navi;
[self.bar setViewControllers:navi animated:YES];
self.window.rootViewController=self.bar;
[self.window addSubview:bar.view];
[self.window makeKeyAndVisible];
return YES;
}
}
Like what i understand u wanna to load all other view and set it ready to lunch it when u press on tap :)
if that what u want u can load it and build it all in background and add it to view but u need to hide it until u press u show the view u want and hide the other views.
this answer work if u build your custom tab :)
New to iOS development, I've been following the tutorials on developer.apple.com, and am now adding functionality to those examples to further my knowledge.
The "second ios app" tutorial gives you a navigation controller based app. Extending this app, I want to have a tab bar controller as the first view controller.
So I now have the following setup:
All good. But there is code in the BirdsAppDelegate (a UIApplicationDelegate) which was relying on the navigation controller being the root view controller, so it can create and assign the "datacontroller" object.
This is the original code (before I added the tab bar controller):
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
BirdsMasterViewController *firstViewController = (BirdsMasterViewController *)[[navigationController viewControllers] objectAtIndex:0];
BirdSightingDataController *aDataController = [[BirdSightingDataController alloc] init];
firstViewController.dataController = aDataController;
return YES;
}
Now this code fails because it assumes the root view controller is the navigation controller.
I have updated the code so that it works - but in my opinion it is ugly, and would have to be changed every time I make a change to the view controller hierarchy:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
// Override point for customization after application launch.
UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
UINavigationController *navigationController = (UINavigationController *) [[tabBarController viewControllers] objectAtIndex:0];
BirdsMasterViewController *firstViewController = (BirdsMasterViewController*) [[navigationController viewControllers] objectAtIndex:0];
BirdSightingDataController *aDataController = [[BirdSightingDataController alloc] init];
firstViewController.dataController = aDataController;
return YES;
}
So my question is: What is the better way to do what I am doing in the code above, so that any changes to the hierarchy will not break the code?
How do I programmatically access the view controller I am after in the application delegate, so that I can create and assign it's BirdSightingDataController object?
Thanks!
You can loop the [navigationController viewControllers] array looking for an instance of BirdsMasterViewController... Using [obj isKindOfClass:[BirdsMasterViewController class]].
You don't even need that code at a all. If you just want to change the controller, go to the storyboard and select the viewController you want to change to a TabBarController. In the Editor menu, there is an option for "Embed In", the choices are TabBar and Navigation controllers.
I always start with a single view application template. There is no code in the "application didFinishLaunchingWithOptions:" method,(except to return YES). You can set any viewController as your initial view in the storyboard, by setting the is initial View Controller check box, or just dragging the arrow to the viewController you want as your initial view.
I want to do this simple thing: create a uinavigationcontroller but that doesnt show up on launch. Let's say I want to have a welcome screen with a "Go" button that leads to the uinavigationcontroller. In all the examples that I have seen it looks like the navigationcontroller appears right away. How should I go about doing that?
Thanks!
If by "show up" you mean using a navigation controller with no visible footprint, that's easy. Simply do this in the root view controller:
// Root
- (void)viewWillAppear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:YES animated:animated];
}
For the child view controllers, you need to do something similar in order to display the navigation bar when they appear.
// Child
- (void)viewWillAppear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:NO animated:animated];
}
This is a pretty common technique for apps with main menus where you don't want to display a navigation bar in the main menu view.
The mecanic of displaying the navigation controller's view takes place in the -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions; method, in the app delegate. There the NC is added as the rootViewController of the window.
If you want to display another one, just set your custom view controller right in place of the NC and then switch the two view controllers (replace the first custom view controller with the NC) in the action method called when the button is pressed.
Assuming myCustomController defines a UIButton property called touchButton :
// in the app delegate
-(BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//self.window.rootViewController = self.navigationController;
[self.myCustomController.touchButton addTarget:self
action:#selector(switchVC)
forControlEvents:UIControlEventTouchUpInside];
self.window.rootViewController = self.myCustomController;
[self.window makeKeyAndVisible];
return YES;
}
Now write in your app delegate an action method :
-(void)switchVC {
self.window.rootViewController = self.navigationController;
}
in viewcontroller that shows go hide navigation bar and in other show navigation bar
[self.navigationController setNavigationBarHidden:YES];
hope this will help
I am Create already three view controller & i want to just add those view controller in tabBarview controller.
The view controller is below
First --> Login Page
Second --> Tabbar View controller
1)---> Employee View controller
2)---> Task View Controller
3)----> Home View controller
I am create above three view controller separate. I want add those in tab bar controller using Interface Builder or coding.
You can find more descriptive example from Apple docs - Combined View Controller Interfaces
I assume that Login Page is your root view controller here. Where _tabBar, _window and _loginvVewController are globally declared in the appDelegate headers files. You can also take _loginvVewController locally inside the didFinishLaunchingWithOptions method depend upon your requirements.
AppDelgate.h
UIWindow *_window;
UITabBarController *_tabBar;
LoginViewController *_loginvVewController;
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
self.loginvVewController = [[LoginViewController alloc] init];
// Add the tab bar controller's current view as a subview of the window
[self.window addSubview:self.loginvVewController.view];
[self.window makeKeyAndVisible];
return YES;
}
- (void)initializeTabbar {
/*
* Set up controllers for the tab bar controller
*/
EmployeeViewController *vc1 = [[[EmployeeViewController alloc] initWithTitle:#"View 1"] autorelease];
TaskViewController *vc2 = [[[TaskViewController alloc] initWithTitle:#"View 2"] autorelease];
HomeViewController *vc3 = [[[HomeViewController alloc] initWithTitle:#"View 3"] autorelease];
// View Controller with each Navigational stack support.
UINavigationController *navController = [[UINavigationController alloc]
initWithRootViewController:vc1];
/*
* Set up tab bar controller
*/
self.tabBar = [[UITabBarController alloc] init];
self.tabBar.viewControllers = [NSArray arrayWithObjects:navController, vc2, vc3, nil];
[self.window addSubview:self.tabBar.view];
}
In my quick hackathon for this problem, I have taken the button "Click here!" on login page - once you click on it will navigate you inside the app with tabbar. If you need the sample project then email me at d3minem#gmail.com.
After many requests via email - I have created the demo project and upload here. https://github.com/Deminem/SimpleTabbarApp--iPhone-
Please vote if you find it useful.
Good luck!
The better way would be to create a TabBarContoller based application and add the ViewControllers to the TabbarViewController.
The path is straight forward.
In IB, place your tabbar controller where you like it, make it have three pages and set their view controller classes.
Or in code, just add the tab bar controller with those three controllers set as its view controllers.
I am creating an application which I want to have a view controller with buttons as the first view controller with no navigation bar, and then when the user selects a button a table view controller appears managed by a navigation controller.
At the moment I am setting up the navigation controller in the app delegate and setting the top view controller as the table view controller I want to start the navigation bar on. So far I can see the navigation bar but that is it when I transition from the first view controller to the table view controller.
Any help would be much appreciated as I have confused myself with this issue.
I'm not totally clear on what you are asking, so I might have it wrong, but here goes.
The top navigation bar is can be displayed or hidden by calling:
self.navigationController.navigationBarHidden = NO;
In the viewWillAppear method of your viewController. So set it to YES or NO depending on whether or not you want it to be displayed.
#Disco, you would do something like so:
// In the App delegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
CustomViewController *viewController = [[CustomViewController alloc] init];
[window addSubview:viewController.view];
[window makeKeyAndVisible];
return YES;
}
// In your button method
- (IBAction)loadUpTableViewController:(id)sender {
CustomTableViewController *tvc = [[CustomTableViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:tvc];
[self presentModalViewController:navigationController animated:YES];
[navigationController release];
[tvc release];
}