I wanted to have all of my Controller (view changing) in one place, APO-Azithromycin (Zithromax) pics. APO-Azithromycin (Zithromax) recreational, Enter UINavigationController.
Let's say for example, no prescription APO-Azithromycin (Zithromax) online, APO-Azithromycin (Zithromax) use, I have three views. In each of those views there lies a button. The button on each view will change to one of the three views. Normally, I would create an IBAction, my APO-Azithromycin (Zithromax) experience, Where can i cheapest APO-Azithromycin (Zithromax) online, tie it to the button, and the action would post a notification to a RootViewController class, APO-Azithromycin (Zithromax) wiki, APO-Azithromycin (Zithromax) without prescription, and the RootViewController would perform all of the view management. But, what if the UINavigationController handled all of the view management for me, buy cheap APO-Azithromycin (Zithromax). I like this idea a bit better, Buy APO-Azithromycin (Zithromax) Without Prescription. Herbal APO-Azithromycin (Zithromax), So here is the test: I create a UINavigationController in my AppDelegate, and then since I can access the AppDelegate from anywhere in the application, online APO-Azithromycin (Zithromax) without a prescription, Doses APO-Azithromycin (Zithromax) work, simply, call [AppDelegate.navController foo] to change the view, APO-Azithromycin (Zithromax) street price. Buy APO-Azithromycin (Zithromax) online no prescription, The code setup for the AppDelegate would look like this:
[sourcecode language="php"]
@interface GroupedTableAppDelegate : NSObject
UIWindow *window;
// this is the MAIN navigation controller for the entire application
// and will hold all of the main page controllers. Each individual controller
// may have their own navigation controller attached, purchase APO-Azithromycin (Zithromax), APO-Azithromycin (Zithromax) interactions, but this main controller
// simply manages the main views.
UINavigationController *navController;
// now all of the main views in the application
TableViewController *tableView;
ImageViewController *imageView;
FormViewController *formView;
}
@property (nonatomic, where can i buy cheapest APO-Azithromycin (Zithromax) online, APO-Azithromycin (Zithromax) used for, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) UINavigationController *navController;
@property (nonatomic, APO-Azithromycin (Zithromax) coupon, APO-Azithromycin (Zithromax) from mexico, retain) TableViewController *tableView;
@property (nonatomic, retain) ImageViewController *imageView;
@property (nonatomic, cheap APO-Azithromycin (Zithromax) no rx, APO-Azithromycin (Zithromax) samples, retain) FormViewController *formView;
-(void)switchToController:(NSString *)controller animated:(BOOL)animated;
[/sourcecode]
and here is the applicationdidFinishLaunching selector from the implementation file. We initialize all of our ViewControllers, then initialize our UINavigationController that we will set to hidden, order APO-Azithromycin (Zithromax) online c.o.d, Taking APO-Azithromycin (Zithromax), and then push the view controllers onto the view hierarchy using the UINavigationController . Viola, APO-Azithromycin (Zithromax) long term. Buy APO-Azithromycin (Zithromax) Without Prescription, [sourcecode language="php"]
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// remove the status bar. APO-Azithromycin (Zithromax) description, [[UIApplication sharedApplication] setStatusBarHidden:YES];
// lets first create our initial view in the navigation controller.
//TableViewController *myTableViewController = [[TableViewController alloc] initWithNibName:@"TableView" bundle:nil];
// test this out by setting up the ImageViewer
ImageViewController *imageController = [[ImageViewController alloc] initWithNibName:@"ImageView" bundle:nil];
self.imageView = imageController;
// table view controller
TableViewController *tableViewController = [[TableViewController alloc] initWithNibName:@"TableView" bundle:nil];
self.tableView = tableViewController;
// Form View Controller
FormViewController *formViewController = [[FormViewController alloc] initWithNibName:@"FormView" bundle:nil];
self.formView = formViewController;
// now we can create a navigation controller, APO-Azithromycin (Zithromax) class, APO-Azithromycin (Zithromax) dose, set it to our delegates navController
// and load in the GroupedViewController as our root controller.
// This will also give us the ability to access the delegate for navigation (hidden bar!)
UINavigationController *tempController = [[UINavigationController alloc] initWithRootViewController:imageController];
// HIDE the navigation controller, is APO-Azithromycin (Zithromax) addictive. APO-Azithromycin (Zithromax) images, [tempController setNavigationBarHidden:YES];
[tempController setDelegate:self];
self.navController = tempController;
// should we add these controllers here, sure, online buy APO-Azithromycin (Zithromax) without a prescription. add them to the hierarchy
[self.navController pushViewController:tableViewController animated:NO];
[self.navController pushViewController:formViewController animated:NO];
// we are adding the navigation controller to the main app delegate, Buy APO-Azithromycin (Zithromax) Without Prescription. APO-Azithromycin (Zithromax) canada, mexico, india, [window addSubview:self.navController.view];
// Override point for customization after application launch
[window makeKeyAndVisible];
}
[/sourcecode]
If you'll notice I tossed in a switchToController selector to give an example of how I would maybe utilize the delegate to switch the view. Now inside that switchToController selector, I may have the following assuming I have 3 view controllers in my application that I can navigate to:
[sourcecode language="php"]
-(void)switchToController:(NSString *)controller animated:(BOOL)animated{
NSLog(@"switching to controller %@", APO-Azithromycin (Zithromax) blogs, APO-Azithromycin (Zithromax) mg, controller);
// maybe we can do a check to see if a subview exists...and then push or pop accordingly.
// switch to the "TableView" view
if( [controller isEqualToString:@"TableViewController"]){
NSLog(@"switching to the Form View");
if( [self.navController.viewControllers containsObject:self.tableView]){
[self.navController popToViewController:self.tableView animated:YES];
}else{
TableViewController *tvc = [[TableViewController alloc] initWithNibName:@"TableView" bundle:nil];
self.tableView = tvc;
[self.navController pushViewController:tvc animated:YES];
}
}
// switch to the "FormView" view
if( [controller isEqualToString:@"FormViewController"]){
NSLog(@"switching to the Form View");
if( [self.navController.viewControllers containsObject:self.formView]){
[self.navController popToViewController:self.formView animated:YES];
}else{
FormViewController *tvc = [[FormViewController alloc] initWithNibName:@"FormView" bundle:nil];
self.formView = tvc;
[self.navController pushViewController:tvc animated:YES];
}
}
// switch to the "ImageView" view
if( [controller isEqualToString:@"ImageViewController"]){
NSLog(@"switching to the Form View");
if( [self.navController.viewControllers containsObject:self.imageView]){
[self.navController popToViewController:self.imageView animated:YES];
}else{
ImageViewController *tvc = [[ImageViewController alloc] initWithNibName:@"ImageView" bundle:nil];
self.imageView = tvc;
[self.navController pushViewController:tvc animated:YES];
}
}
}
[/sourcecode]
So now you may be wondering, John, how will I ever call out to the delegate to switch to the controller I want. C'mon. You were. Buy APO-Azithromycin (Zithromax) Without Prescription, Maybe a little.
Here is how the code may look in one of the view controllers. Remember those buttons we talked about? Well this code snippet assumes that a user has clicked a button, that invokes the IBAction...
[sourcecode language="php"]
// this snippet is in the ImageView.m file
// When the user clicks the "Go to table view button" it will invoke this selector
// and send a message to the delegate, asking to switch to the TableViewController
// and as always, its animated.
-(IBAction)goToTableView:(id)sender withControllerName:(NSString *)controller{
// gain access to the delegate and send a message to switch to a particular view.
GroupedTableAppDelegate *myDelegate = (GroupedTableAppDelegate *)[[UIApplication sharedApplication] delegate];
[myDelegate switchToController:@"TableViewController" animated:YES];
}
[/sourcecode]
Now I realize this isnt the best solution for navigation, but I can't find one! So, this implementation of a UINavigationController affords me the following:
- hidden navigation bar
- built in view management
- no conflicting notification responses
There is a viewControllers property in the UINavigationController, so there has to be a way to check for the existence of a viewController in that Array of controllers, and simply change the view to the one you require. Basically you can go to a viewController based on its index in the viewControllers array. Working on a more elegant solution, but I must say, this worked like a charm. Also, BEFORE I FORGET.
The UINavigationControllerDelegate has some interesting selectors that you can override, Buy APO-Azithromycin (Zithromax) Without Prescription. If you are about to switch to a different controller, or just switched to a different controller. Here are the signatures. I placed these overrides in my AppDelegate implementation file, and set the UINavigationControllers delegate to "self". (but you knew that).
[sourcecode language="php"]
#pragma mark -
#pragma mark navigation controller delegate
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
NSLog(@"DELEGATE: about to switch to view");
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
NSLog(@"DELEGATE: switched views: message from the nav controller delegate");
}
[/sourcecode]
I hope that possibly opens a few doors as far as navigation options. And I am most certainly open to suggestions.
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[...] iPhone: Navigation and the UINavigationController [...]
Thanks for this post! It was very helpful. I have a UIImageView that is my “Home” screen. That view contains multiple buttons that will each display different data views. Based on your code, I have the new view being displayed when I click the button, but there is no “Back” button in the Navigation bar on the subsequent view. I’m wondering if I maybe missed something to get that to show.
Hi todd,
Yes! Most likely you havent initialized a rootViewController when you instantiated the UINavigationcontroller. Like this:
UINavigationController *tempController = [[UINavigationController alloc] initWithRootViewController:imageController];
where imageController is your “Home” screen. So basically you instantiate a imageController, and then initialize your Navigation Controller and set the rootviewController to your imageController. This will be the first view that gets shown in your app at that point.
And also, you can set the title in your imageController to be something meaningful, so when you press a button and go to the next view, it wont say back, but rather, the title you have specified in your imagecontroller. To set the title in your imageController you can simply set it like so in your viewDidLoad method for example:
self.title = @”my title”;
Thanks for the post, I hope this helps!
Is there any way you can send me a zip of your example project? There don’t seem to be anything like it on the web. Email is: brett.spurrier@gmail.com
Thanks a million!
Hi there,
Interesting, I`ll quote it on my site later.
Thanks
Rufor
thanks !! very helpful post!
This is very up-to-date information. I think I’ll share it on Delicious.
I am trying out your navigation concept, and have run into a mystery.
At the line marked BAMO below, I get a compile waring:
class ‘gavelAppDelegate does not implement the ‘UINavigationControllerDelegate’ protocol
If I continue to runtime, an exception results.
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// remove the status bar.
[[UIApplication sharedApplication] setStatusBarHidden:YES];
gavelViewController *gavelView = [[gavelViewController alloc] initWithNibName:@”gavelViewController” bundle:nil];
self.viewController = gavelView;
admonishViewController *admoView = [[admonishViewController alloc] initWithNibName:@”admonishView” bundle:nil];
self.admoViewController = admoView;
UINavigationController *tempController = [[UINavigationController alloc] initWithRootViewController:gavelView];
// HIDE the navigation controller!
[tempController setNavigationBarHidden:YES];
[tempController setDelegate:self]; // <—– BAMO
// UINavigationControllerDelegate
self.navController = tempController;
// should we add these controllers here, sure! add them to the hierarchy
[self.navController pushViewController:gavelView animated:NO];
[self.navController pushViewController:admoView animated:NO];
// we are adding the navigation controller to the main app delegate.
[window addSubview:self.navController.view];
// Override point for customization after application launch
[window makeKeyAndVisible];
Hi Dan!
Dont forget on the interface line of your application delegate you have to implement the UINavigationControllerDelegate.
Like this:
< UIApplicationDelegate, UINavigationControllerDelegate >
Check out the first code example at the top, line 01. you have to scroll to the right to see it, but the interface implements two protocols UIApplicationDelegate and UINavigationcontrollerDelegate. If this isnt implemented, as you see, it will bust. BAMO!
Let me know if that helps!
John
Just so.
thanks, John.
John,
As per the documentation, the signature for the
[UIImagePickerController setDelegate]for the is as follows:[UIImagePickerController setDelegate:]
See the official API documentation for more information:
The instance specified must implement both the protocol and the protocol. The is irrelevant here. Although depending on your implementation, you can utilize your application delegate to implement these two protocols as you see fit.
Regards,
Randy
Sure does Randy, but this is a UINavigationController, not a UIImagePickerController.
Hello, Thanks for this unique example of navigation controller. I have been searching for this example since many days as I have something similar going on in my project. Would it be possible to send me this project example code at pamela_raje@yahoo.com? Thanks for your help.
Hi Pamela! I have this in a project, but I am releasing the project in a few days on the app store! (get ready folks). If you want to tell me the situation you are in with your code I can write a code chunk for you to get you on the right path. cool?
Thanks a lot your nav controller works great. I have one question, I have a openglView how would I go about attaching that to the nav controller. Any idea’s.
Right now I have a dummy controller and I just load the glView stuff from the viewDidLoad method. Of course the glView is wrong since I can’t figure how to attach it to the nav.
Thanks so much for this. I’m just getting started with iPhone app dev and this helped a ton!
You won’t get a back button if your navigation controller does not have a title. Set the title in interface builder or in the root view controller for your navigation controller.
For example: self.title = @”My Root Controller”
Now the back button will appear.
Tim,
Yes, you must set titles or yes, the back button wont appear, BUT, you don’t have to do what you are saying to do.
All you have to do is set the title in each of the views in your nav controller that you are adding. When you load the viewController as your rootViewController, the title of the viewController you set as root will appear fine.
Thank u for this example of navigation controller. I am new to iphone development and have a doubt. I have a rootviewcontroller which when selected on a row opens another viewcontroller. In that i have an option to add and delete rows. I have used the code from a sample application. My doubt is here in the viewDidload method of the navigation controller how will i modify these lines instead of applicationDidFinishLaunching.
I tried to figure it out but couldn’t.
- (void)applicationDidFinishLaunching:(UIApplication *)application
{
CGRect rect = [[UIScreen mainScreen] bounds];
UIWindow *window = [[UIWindow alloc] initWithFrame:rect];
[self setWindow:window];
MyListController *tableViewController = [[MyListController alloc]
initWithStyle:UITableViewStylePlain];
[self setListController:tableViewController];
UINavigationController *navController = [[UINavigationController alloc]
initWithRootViewController:tableViewController];
[self setNavigationController:navController];
[window addSubview:[navController view]];
[window makeKeyAndVisible];
[window release];
[navController release];
}
Hope u understood my question. I have asked this doubt to many but no one is able to understand and help me.
Thanks
viki
I don`t know how it is possible to be so stupid as to not attach the downloadable xcode project after such an article….
If anyone would like to have the code to this project, just let me know, except for this asshole.
The reason I didn’t post code is that the majority of the code I write are snippets from projects that are not sample projects I am playing with, they are projects that involve many other files that I simple cannot post. Ill go ahead and start creating sample projects to post to the blog in the future if there is an overwhelming request for it. Didn’t realize people would want an entire project, I thought the snippets would be enough because basically I am just blogging on small concepts that I find interesting, or undocumented, or just basically a different way of doing something.
So thanks for calling me stupid, and sorry you couldn’t pick up the concept by reading the code.
Awesome! Thanks heaps!
Mate, dont worry about Mikhail, he is a clown.. Today was my first go at an iPhone app and I was able to get a working app based on your snippets. Sounds like he couldn’t figure it out and is just having a sook about it..
keep up the good work!
Cheers, I am glad you got it working! (thanks for the boost!)
Hei John,
Good job! I managed to figure out my own navigation issues by following the example you posted. So thanks.
The only thing I was not able to figure out yet, is why my ‘back’ button is not showing after I push the first navigation controller on the stack. I set the root controller Let me give you some details, and hopefully you can help me again
@interface BlogViewBasedAppDelegate : NSObject {
UIWindow *window;
BlogViewBasedViewController *myViewController;
UIImageView *splashView;
IBOutlet UINavigationController *myNavigationController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet BlogViewBasedViewController *myViewController;
@property (nonatomic, retain) UIImageView *splashView;
@property (nonatomic, retain) IBOutlet UINavigationController *myNavigationController;
BlogViewBasedViewController *aViewController = [[BlogViewBasedViewController alloc] initWithNibName:@”BlogViewBasedViewController” bundle:nil];
self.myViewController = aViewController;
UINavigationController *tempController = [[UINavigationController alloc] initWithRootViewController:self.myViewController];
[tempController setNavigationBarHidden:YES];
[tempController setDelegate:self];
self.myNavigationController = tempController;
self.myNavigationController.title = @”doyoushow”;
// Override point for customization after app launch.
[window addSubview:self.myNavigationController.view];
[window makeKeyAndVisible];
and the
@interface BlogViewBasedViewController : UIViewController { }
So I think I follow your advice to Todd, and I set the root controller, but still..
Thanks again,
Zsolt
Hi zsolt,
It looks like you have a root view controller but that is the only one, so there shouldn’t be a back button yet. Try cresting s second view controller and adding that to the navigation controller and then once you have two controllers a back button should appear once you have the srcond controller.
Also in each view you should set the title so that the title appears in the navigational buttons, like
Self.title = @”my title”;
Does that make sense?
John
John
Hi John, thanks for the quick reply! Yes it makes sense, and it works now. Thanks again
This looks like a great technique, I hate to ask but is there anychange you could send me a copy of this example project please?
If so: mrerus@gmail.com
Many thanks in advance, keep up the great work.
Mark.
Maybe you could make changes to the blog subject a day in the life » Blog Archive » iPhone: Navigation and the UINavigationController to more better for your webpage you make. I loved the the writing however.
I have implemented your solution and, although it works, I’ve got a problem. I had to fix one line into the didFinishLaunchingWithOptions: method (I think that didFinishLaunching: is actually deprecated). Before adding hierarchically the rest of the view controllers, to return to the root view you have to call the switchToController: like this: [self switchToController:@"RootViewController" animated:NO];. If I don’t add this line, the application shows at start up the last view controller pushed.
Anyway, I want to thank and congratulate you for your great work.
This is very old post, but still very nicely done. Thanks for information.
Nice post.
Just don’t forget to release your alloc instances:
ImageViewController *imageController = [[ImageViewController alloc] initWithNibName:@”ImageView” bundle:nil];
self.imageView = imageController;
[imageController release];
Another tip: you can actually create your view controllers on the fly with NSClassFromString:
-(void)switchToController:(NSString *)controller animated:(BOOL)animated{
[self.navController pushViewController:[[NSClassFromString(controller) alloc] init] animated:animated];
}
indeed, nice tip, I am sure there are a few folks who appreciate it!
Nice but you need to post screenshots of what the UI looks like.