I have a class called CataloguesEtTarifsPDFViewController which displays a tableView.
Now, inside this class I wanna create a UINavigationController and set the root of the UINavigationController this class:
Here is what I did:
CataloguesEtTarifsPDFViewController.h
UINavigationController *navigationController;
in the implementation file
CataloguesEtTarifsPDFViewController.m
- (void)viewDidLoad
{
CataloguesEtTarifsPDFViewController *catalog =[[CataloguesEtTarifsPDFViewController alloc] init];
loadingView.hidden=YES;
navigationController = [[UINavigationController alloc] initWithRootViewController:catalog];
}
When I click on the table cell I do this:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
WebViewController *webViewController = [[WebViewController alloc] init];
[self.navigationController pushViewController:webViewController animated:YES];
[navigationController release];
}
But when I run and click on the tableView nothing happens...not view is showed up!!!Where am I going wrong?
IMPORTANT: I don't have a delegate file.Only CataloguesEtTarifsPDFViewController.h CataloguesEtTarifsPDFViewController.m and CataloguesEtTarifsPDFViewController.xib.
EDIT:
- (IBAction)showViewCataloguesEtTarifsPDF:(id)sender{
// Remove view to middleView
[mainMenuViewController removeViewsToMiddleView];
// create view controller
cataloguesEtTarifsPDFViewController = [[CataloguesEtTarifsPDFViewController alloc] init];
cataloguesEtTarifsPDFViewController.mainMenuViewController = mainMenuViewController;
// hide/show header button
[mainMenuViewController.headerViewController showMainMenuButton];
// highlight footer tabbar button
[mainMenuViewController.footerViewController.footerTabBar setSelectedItem:mainMenuViewController.footerViewController.footerTabBarItemMyAudi];
UINavigationController* navigationController = [[UINavigationController alloc] initWithRootViewController:cataloguesEtTarifsPDFViewController];
[self presentModalViewController:navigationController animated:YES];
}
You should probably read this: http://www.iosdevnotes.com/2011/03/uinavigationcontroller-tutorial/
Or this: http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html#//apple_ref/doc/uid/TP40007457-CH1-SW1
Or watch this: http://peepcode.com/products/iphone-view-controllers-part-i
That'll give you the basics and you'll be well equipped to answer your question and fix your code :)
PS: You don't have to explicitly create and set a UINavigationController in your view controller. If the view controller is embedded within a navigation controller, the navigationController property of your view controller instance will automatically find it and return it.
What you're doing in viewDidLoad is wrong.
Wherever you are showing the CataloguesEtTarifsPDFViewController, you should wrap it in a UINavigationController there and show the UINavigationController instead.
This will make sure the navigationController property of UIViewController will be set.
In your tableView:didSelectRowAtIndexPath: method you should release the webViewController variable instead of the navigationController property.
Related
I'm trying to load a specific UITableViewController as the Detail view of a UISplitViewController when the user selects a cell within the Master view; but having some problems. When i select the cell, it just shows a blank window with out a table view controller.
However if i change the App Delegate to just load the UITableView controller without using the UISplitViewController it works fine, so i know it's a problem with the way i've coded the UISplitViewController.
The view hierachy:
UISplitViewController
-->
UINavigationController
--> UITableViewController (DetailViewController)
UINavigationController
--> UIViewController (ColorViewController)
The user selects a cell in ColorViewController and that should change the DetailViewController.
In AppDelegate.m:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.viewController = [[ViewController alloc] init];
self.window.rootViewController = [self.viewController splitViewController];
[self.window makeKeyAndVisible];
return YES;
}
In ViewController.m:
- (UIViewController *) splitViewController {
// Create the navigation-run root view
ColorViewController *rootVC = [ColorViewController controller];
UINavigationController *rootNav = [[UINavigationController alloc] initWithRootViewController:rootVC];
// Create the navigation-run detail view
DetailViewController *detailVC = [DetailViewController controller];
UINavigationController *detailNav = [[UINavigationController alloc] initWithRootViewController:detailVC];
// Add both to the split view controller
svc = [[UISplitViewController alloc] init];
svc.viewControllers = [NSArray arrayWithObjects: rootNav, detailNav, nil];
svc.delegate = detailVC;
return svc;
}
In ColorViewController.m:
#interface ColorViewController : UITableViewController
...
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UIViewController *controller = (UIViewController *)self.splitViewController.delegate;
TableViewController *tvc = [[TableViewController alloc] init];
[controller.view addSubview:tvc.view];
}
What's the best way to change the Detail view within a UISplitViewController? Should i just add the replacement view to UIViewController like above or is there a better way? Maybe that's the cause of my problem?
Since you have a navigation controller handling the detail side of your split view, your strategy should be to use it to push your new table view controller. When I've done this, I've kept references to both navigation controllers as properties in the app delegate so that I can use one or the other for push operations.
I'm not sure what the real purpose of your ViewController class is but if you move its splitViewController method into the app delegate it would be easier to change the navigation controllers from local variables to properties in a place where they can be easily accessed.
I'm going to answer my own question..
For some reason, in the Master view (ColorViewController), the detail object TableViewController *tvc needs to be declared as an instance variable, not as a variable within a method.
After doing that, it works and displays the table properly.
I don't really understand why though, if anyone would like to try to explain.
Cheers,
I have a ViewBased App. I added a UITableView on one of the UIViewControllers. It shows the data and I implemented all the delegate methods etc. My problem is when I want to show the detailView it just doesn't happen. My code:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailViewController *detailViewController =[[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
NSLog(#"DidSelectRowAtIndexPath");
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
}
I see that I need a navigationController but I don't have one and I was unsucessful trying to add one programatically. I don't have one in my appDelegate either, so my question is do I need to add one to show the detail view? If yes, please give me a code sample how to do that.
If not, what other way is there?
I am new to iOS so I am a bit lost here.
Please help!
To add a navigation controller programmatically just for this detail view, you need to something like this:
UINavigationController * controller = [[UINavigationController alloc] initWithRootViewController:detailViewController];
[[detailViewController] release];
[self presentModalViewController: controller animated: YES];
If you want to use pushViewController, you need to already have a navigation controller surrounding the view you're starting with.
You need to add the Navigation Controller FIRST, then your master table becomes the root view controller of the nav controller, then when you tap a row in the table, you push another view controller onto the nav stack.
How does your master table get into the app in the first place? If you're using a nib, it's super easy to just change out the view controller for a nav controller with the old view controller added as a child of the nav controller.
You can create one programmatically by working within your app delegate's application:didFinishLaunchingWithOptions: method like so:
UITableViewController *tableViewController = [[[WhateverYourSubclassVCIsCalled alloc] init] autorelease];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:tableViewController];
window.rootViewController = navController;
[window makeKeyAndVisible];
I'm trying to use a UINavigationController but I'm uncertain how. Up till now (for about a year), I've been using presentModalViewController and dismissModalViewController to present/dismiss view controllers.
So, this is what I did. My main view controller (the first one that shows on launch) is called MainViewController, and it extends UIViewController.
So I made this launch function in my app delegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
MainViewController *controller = [[MainViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:controller];
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}
And in my MainViewController's viewDidLoad method:
- (void)viewDidLoad {
[super viewDidLoad];
self.title = #"Title";
self.navigationController.navigationBar.tintColor = [Constants barColor];
....more code...
}
But, in my MainViewController, I'd like to present another view controller called SecondViewController, which needs a UINavigationBar with a back arrow button. So do I make SecondViewController extend UIViewController and do the same thing by setting the title and backButton in the viewDidLoad method? And how do I present it? What should I do to accomplish this?
You'll need to set a root view controller up, it's easiest starting from the apple template.
Here's where the magic happens:
UIViewController *controller = [[UIViewController alloc] initWithNibName:#"MyNib" bundle:nil];
[self.navigationController pushViewController:controller animated:YES];
[controller release];
The nav controller does all the work for you (back buttons, titles, animations) - it keeps track!
My workflow is this:
Setup MutableArray in the viewDidLoad, add controllers to it, e.g:
NSMutableArray *array = [[NSMutableArray alloc] init];
MyCustomViewController *customView = [[MyCustomViewController alloc] initWithNibName:#"nib" bundle:#"nil"];
customView.title = #"Second Level";
[array addObject:customView];
self.controllers = array;
Then in your delegate:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSUInteger row = [indexPath row];
UIViewController *childControllerToBe = [controllers objectAtIndex:row];
[self.navigationController pushViewController:childControllerToBe animated:YES];
}
This, along with a lot more can be learnt by reading a decent beginner book such as Beginning iPhone Development
Also, apple docs are always good :)
UINavigationController is a subclass of UIViewController, but unlike UIViewController it’s not usually meant for you to subclass. This is because navigation controller itself is rarely customized beyond the visuals of the nav bar. An instance of UINavigationController can be created either in code or in an XIB file with relative ease.
Please visit "How to add UINavigationController Programmatically"
You should Push it onto the navigation stack.
This Lecture by Stanford's iPhone Course will teach you a lot about Navigation Bars. (It's a quick read)
Basically at the heart of it you need this code:
[self.navigationController pushViewController:SecondView];
You can use PopViewController to go back programmatically, but the Back Button is automatically created.
Here's some source code from the Lecture. It covers exactly what you are having issues with.
The other day I asked about using a UINavigationController as a child of a UIViewController. I got that working via the answer. Now what I'm trying to do is push a controller onto the nav stack. When a table cell is touched, I do the following:
- (void) showSetup {
NSLog(#"Showing Setup");
SetupViewController *controller = [[SetupViewController alloc]initWithNibName:#"SetupViewController" bundle:nil];
self.setupViewController = controller;
self.setupViewController.title = #"Setup";
[self.navigationController pushViewController:self.setupViewController animated:YES];
[controller release];
}
I can see the log statement in my console, but the view never changes. Am I missing something?
Hmmm, well it's a bit tricky without knowing the details of your implementation -- I assumed that you implemented your navigation controller as in the linked article. Also although you give no details it sounds like you've added a table view controller somewhere along the line, so I made the UIViewController conform to the UITableView protocols to handle everything in one place:
#interface SOViewController : UIViewController<UITableViewDelegate,UITableViewDataSource > {
UINavigationController* navController;
}
- (IBAction) pushMe:(id)sender;
#end
I dropped a button on the SOViewController's view in IB and wired the pushMe: action to it. I also created another UIViewController-based class called JunkController and dropped a "Junk" label on it's view in IB -- that's all I did in IB. In the SOViewController's viewDidLoad:
navController = [[[UINavigationController alloc] init] retain];
navController.navigationBar.barStyle = UIBarStyleBlackOpaque;
navController.toolbarHidden = YES;
UITableViewController* tvController = [[UITableViewController alloc] init];
UITableView* tv = [[UITableView alloc] init];
tvController.tableView = tv;
tv.delegate = self;
tv.dataSource = self;
[navController setViewControllers:[NSArray arrayWithObject:tvController]];
In the pushMe: action implementation:
[self presentModalViewController:navController animated:YES];
Implemented the tableView delegate and datasource methods; for selection:
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"row selected");
JunkController* junk = [[JunkController alloc] initWithNibName:#"junkcontroller" bundle:nil];
[navController pushViewController:junk animated:YES];
[junk release];
}
This should yield an app that surfaces a screen with a "Push me" button. When that button is pressed you should get an animated modal navigation-based table view -- mine had one row in it that contained a label "select me". Touching this row should animate the junk controller into view.
There is no need to make setupViewController a declared property in this view controller. Also, I could be mistaken but I thought "controller" was a reserved name in Cocoa, I'd change that name. So make sure you have registered with the UITableViewDelegate and use - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath to hook into and push your new view controller as follows:
SetupViewController *detailViewController = [[SetupViewController alloc] initWithNibName:#"SetupViewController" bundle:nil];
detailViewController.title = #"Setup";
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
Goodluck!
I have 2 XIBs with their corresponding View Controllers. Will call them MainViewController and AboutViewController. The names of the XIBs are exactly the same as the names of the ViewControllers. Upon a button click in the MainViewController, I want to show the AboutViewController.
I have code like this in the MainViewController:
- (IBAction) infoButtonAction:(id)sender {
AboutViewController *aboutViewController = [[AboutViewController alloc] init];
[[self navigationController] pushViewController:aboutViewController animated:YES];
}
But nothing happens, the AboutViewController does not show up. I also tried this line:
AboutViewController *aboutViewController = [[AboutViewController alloc] initWithNibName:#"AboutViewController" bundle:nil];
But to no avail. What am I missing?
Examine your AboutViewController.xib in Interface Builder and ensure that the File Owner is set to AboutViewController in the class inspector. Also ensure that the view property of the File Owner is wired into the View in the xib. Finally, the code to display it should read:
- (IBAction) infoButtonAction:(id)sender {
AboutViewController *aboutViewController = [[AboutViewController alloc] initWithNibName:#"AboutViewController" bundle:nil];
[[self navigationController] pushViewController:aboutViewController animated:YES];
[aboutViewController release];
}
Also, you should check that this is non-nil inside that same method:
UINavigationController * nc = self.navigationController;
do you get an error? Did you check that the button is correctly wired in IB?
did you try using a modal view controller?