Adding a Navigation Controller to a Tab Bar Application (Programmatically) - iphone

This might look like a silly question to some, but handling the different types of controllers in an iPhone application is still a little fuzzy to me. Here's the setup:
I have a Tab Bar application with four tabs. Each tab passes control to its respective ViewController, where some of those are initialized with a .XIB file and some are done purely programmatically. One of the programmatic ones is DirectionsViewController, which is essentially a UITableViewController. Selecting a cell from its table needs to present (modally) a DetailedDirectionsViewController, which needs to have some sort of back-reference to the presenting view controller. I figured the easiest way to do this is to add a navigation controller to the Directions and DetailedDirections VCs - except I don't know how to do this without a .XIB file.
Also, the way I hand control over to DetailedDirections is by changing Directions the following way:
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailedDirectionsViewController *vc = [[DetailedDirectionsViewController alloc] initWithStyle:UITableViewStyleGrouped];
[self.tabBarController presentModalViewController:vc animated:YES];
}
I seem to recall one of my professors saying that presentModalViewController is kind of an old method and there are better alternatives... I just can't remember them right now.


For what you want to do it would be best to have the tab in your tabbar manage a UINavigationController, and to set the rootViewController of that navigation controller to your DirectionsViewController.
Then in your direction view controller's didSelectRowAtIndexPath: methods you can do the following:
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailedDirectionsViewController *vc = [[DetailedDirectionsViewController alloc] initWithStyle:UITableViewStyleGrouped];
[self.navigationController pushViewController:vc animated:YES];
}
And it will function like you want it to. The UINavigation controller will take care of putting a back button on your detailed directions view controller.


If I understood well, in the tableview:didSelectRow..: you just need to create a navigation controller initializing it with the view controller that you want to display modally, before presenting it create a UIBarButtonItem and add it to the navigation bar of the navigation controller as selector create a new method with the dismiss command inside.

Related

Pushing UIViewController to NavigationController does not actually push the view

I have this code in my table view controller (and delegate):
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
DetailStatus *detailViewController = [[DetailStatus alloc] initWithNibName:#"DetailStatus" bundle:nil status:[mStatuses objectAtIndex:indexPath.row]];
[[self navigationController] pushViewController:detailViewController animated:YES];
[detailViewController release];
[self.tableView deselectRowAtIndexPath:indexPath animated:NO];
NSLog(#"exiting didselectrow");
}
And in my DetailStatus class:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil status:(NSDictionary *)pStatus {
NSLog(#"I am being called %d", [pStatus objectForKey:#"id"]);
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// some stuff
}
return self;
}
The funny thing is, my DetailStatus is actually being initialised, in the console window, it even outputs "I am being called 000001" but strangely the view is not being pushed to the table view...
I've checked the nib name, and it's ok. I checked the DetailStatus heading file, it looks ok (like this):
#interface DetailStatus : UIViewController {
So does anyone know why the view is not being pushed to the window even if I've initialised it and pushed it?
UPDATE: I tried logging some debugging messages to viewDidLoad in DetailStatus, and it seems like the view is not loaded even though the class was instantiated... I wonder why.
UPDATE2: I have a feeling that this might be my navigation controller organisation that's wrong.. I have this following:
Login page -> customtabbar -> First table view -> DetailStatus
-> Second table view -> DetailStatus
I think I'm only maintaining one navigation controller in that hierarchy. I've never created other navigation controllers. I only push view after another.
Thank you everyone for the answers! I will give out the bounty soon, I'll let other people vote first before the bounty expires.

After looking at it,the scenario seems to be same like me.What I faced for the first time when doing Tab+Navigation.
I am sure that there is some problem with your Tab+Navigation based application.
Although it shows the Tab as well as navigation are not able to navigate the basic flow.And it is very difficult to solve your problem with such less code.
Instead of this, I had an alternate solution for the same:
Once you have a tab bar in a XIB, the easiest way to approach this is to drag a UINavigationController object over from the Library window (looks like a left nav bar button on a gold background) into the Tree View for your tab bar (the text only view, not the GUI). Place it under the tab bar, then drag your existing view controller under the tab bar controller instead of under the tab bar.
When you go to view that tab you should then see a navigation bar on the top of it... if you are loading the navigation controller from another xib, you'll modify the nav bar in the tab bar xib.
else you can below you can follow the best url for the same:
http://books.google.co.in/books?id=2yYlm_2ktFYC&pg=PA179&lpg=PA179&dq=navigation+with+the+tab+based+application+iphoneSDK&source=bl&ots=nf2YYjX5Am&sig=COpHj9wOtsDChQBglpsljSTsElw&hl=en&ei=3ZoFTeGSOI_tsgbc_Iz6CQ&sa=X&oi=book_result&ct=result&resnum=6&ved=0CDAQ6AEwBQ#v=onepage&q&f=false
http://www.youtube.com/watch?v=LBnPfAtswgw
Hope this will surely solve your problem.

Unless the UINavigationController is the immediate parent of your table view controller, [self navigationController] will return nil.
I'm unclear exactly where it lies in the view controller hierarchy, based on your explanation, but I suspect you might have your UITabBarController nested within the navigation controller, when it should be the other way around. If, by chance, you actually mean to push the tab bar off screen (and thus you do want the tab bar controller nested within the navigation controller), you will need to call something like the following:
UIViewController *parentViewController = self.parentViewController;
[parentViewController.navigationController
pushViewController:detailViewController
animated:YES
];
P.S. Once the push is working correctly, you won't need to deselect the tapped row, as UITableViewController does this automatically when the view reappears.

I not seen putting status on the end of the init of the view. Guessing that's something you added.
Dont you just need to do [self pushViewController etc instead of the navigationController bit

Could it be that the nib is not wired up correctly. I.e. In the nib there is no connection between the view and the controller so even though the controller is pushed correctly, the navigation controller cannot find the view.
Just a guess!

You need to implement like above In tab controller put navigation controller according to your tabs and in navigation controller you can put your tab item.And also you need to set tab bar item nib file.then on tapping a tab you get tab screen and because of navigation controller you can easily navigate.even you can navigate on the screen of any tab main screen.
This is the way which you need to implement.
It definitely helps you but you need some logical implementation.

Is your tableViewController directly pushed to the navigation controller or is there another viewController in between ? Check the value of [self navigationController] against the value of your navigationController (from the place your actually instanciate it)

Once check that have you initialized the First Tableview and Second TableView with Navigation controller or not.
While adding to the tabBar, have you added the UINavigationController or only the UIViewController object.
PM_FirstNavigationController *First_navController = [[PM_FirstNavigationController alloc] initWithRootViewController:FirstTableViewController];
tabBarController.viewControllers= [NSArray arrayWithObject: First_navController];
You have to add the view controllers to the tabBar's like that.
Then while calling the [self navigationController], it will give navigation controller object.
Regards,
Satya

UINavigationController - do not want this to appear first page iPhone

I am going to use an UINavigationController to keep track of all the views the user visits. This is all well and good except that I do not want the navigation bar to appear on the first view. Is it possible not to show the navigation bar on the first view?
Thanks!

sure, you can use - (void)setNavigationBarHidden:(BOOL)hidden animated:(BOOL)animated on the navigation controller, when you want to hide it and then use it again to display it.
so if you are on a view controller that is the root for the UINavigationController, you might want to call it in the viewWillAppear: method:
[self.navigationController setNavigationBarHidden:YES animated:NO];

iphone uitableview to another view

in my program I need a tableview and, when you click onto a row, the view scroll left and show the details (like the mail for example...)
how can I do this??
I explain... it's an automatic thing or I need to manage by hand the animation of the view??
thanks in advance

I use UINavigationControllers to achieve this effect of the detail animating left when you click on the row. So you need a UINavigation controller above the UIViewController or UITableView Controller that controls your table.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
...my code
[self.navigationController pushViewController:myViewController animated:YES];
}

Your case is exactly what UINavigationController class is for - it will handle your controllers hierarchy and will do animated transition for you as well. To learn how to use it you can have a look at Apple's NavBar sample.

Iphone -- push a view controller onto the navigation stack when a button is clicked in a UITableViewCell

When a button is pushed in one of my app's table view cells, I need to push a certain view controller onto the navigation stack.
This could be done by using an instance of NSNotification to inform the table view's controller of the button press. But that would be awfully heavyweight, especially since selections in a tab bar in the app could cause the table view to appear or disappear, creating additional overhead as the various table views register and unregister themselves whenever they are tabbed onto or off of the screen.
Can anyone think of a better solution?

Why not put
[[self navigationController] pushViewController:targetViewController animated:YES];
in the method called by the button?

Make your UITableViewController use the UITableViewDelegate Protocol and implement this method:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
From the indexPath you can get which row has been pressed and then you know which cell is being selected. The purpose of the UITableViewController is to know about the cells and the cell itself does not need a button to trigger an event to push a new view.

What I did was set the table view's delegate to be the same as its controller. Then:
UITableView *myTableView = (UITableView *)self.superview;
NSIndexPath *indexPath = [myTableView indexPathForCell: self];
MyTableViewController *myTableViewController = (MyTableViewController *)(myTableView.delegate);
[myTableViewController buttonWasPressedOnCellWithIndexPath: indexPath];

Set a navigation controller without an app delegate

I would like to show a Navigation Controller after clicking a button. Every tutorial assumes the navigation controller will be the first screen so it links it to the App Delegate, but App delegate only appears at MainWindow.xib.
How do you guys add a navigation controller to a view different than the MainWindow?
Thanks!

Here is some sample code to expand on Roger's answer. The following method is linked to some user interaction on the current view controller (to compose an email for example). This will give the compose view the navigation bar across the top instead of coding buttons inside your custom view.
-(void) composeButtonPushed: (id) sender {
ComposeViewController *controller = [[ComposeViewController alloc] initWithNibName:#"ComposeView" bundle:nil];
UINavigationController *composeNavController = [[UINavigationController alloc] initWithRootViewController:controller];
[self presentModalViewController:composeNavController animated:NO];
}

UINavigationController is to navigate a heirarchy of views with UIViewControllers. If you don't have a root UIViewController, it won't work (and doesn;t make sense). If you do have a UIViewController, you simply send a - (id)initWithRootViewController:(UIViewController *)rootViewController init message to a new navigation controller passing in your UIViewController.