I need to set the view controller of the home screen as the the root of the navigation controller, no matter how the user reaches it (push/show or custom segue)
The following code put in the viewDidLoad of a view controller seems to have no effect with iOS 7:
[self.navigationController setViewControllers:#[self]];
The navigation stack does not change at all.
Have you ever experienced any similar issue?
Thanks,
DAN
Call your UIViewController method from app delegate like this..try it out.
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
ViewController* pp = [[ViewController alloc] init];
UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController:pp];
self.window.rootViewController = nav; or [self.window setrootviewcontroller=nav];
[self.window addSubview:[nav view]];
[self.window makeKeyAndVisible];
Only one line to make your current viewController as rootviewcontroller
[[[UIApplication sharedApplication] delegate] window].rootViewController = self;
Create global reference of navigation controller in App Delegate and then with the reference of appDelegate you can change you rootView controller anywhere just type below code :
[appDelegate.navigaitonController initWithRootViewController:viewController];
Note: Here viewController is new viewcontroller reference which you want to set as root of navigation controller .
Related
i would like to create an App whit a structure similar to the native application "Phone" of the iPhone. I will be more precise, the phone application have a tabBar that contains:"Favorites" , "Recents", "Contact", "Keypad" and "Voice Mail".
When we enter in the tab contacts we can see a navigation bar and a tableView.
I would like to have a similar structure but i'm questioning myself about which is the best and most correct way to do it?
I was thinking to start a single view application than use the view controller that is create automatically as a TabbedViewController then i would create another subclass of another viewController and i used it as my NavViewController.
I would have something like
[myTabBar.view addSubview:myNavController];
but how can i set those instance? once i have the automatically created ViewController and i create a SecondviewController how can i set them as the TabViewController and my NavViewController ?
If you're using storyboards, just add a tab bar controller to your storyboard. Then select one of the tab bar's child scenes and then choose "Embed In" - "Navigation Controller" from the Xcode "Editor" menu. If you repeat that process for whichever tabs you want to have navigation controllers. In this screen snapshot, I've added a navigation controller to the first and third tabs, but not the second.
Hopefully this illustrates the idea.
If you're determined to do this with NIBs, the easiest way to get started is create a new project with the Tabbed Application template (and obviously, at the next screen, uncheck "Use Storyboards"):
Then open up the app delegate .m file and replace the default didFinishLaunchingWithOptions that looks like:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = #[viewController1, viewController2];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
with one that creates a separate navigation controller for each tab for which you want a navigation bar (in this case, I'm adding it to the first one only, but it illustrates the idea):
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
UINavigationController *navigationController1 = [[UINavigationController alloc] initWithRootViewController:viewController1];
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = #[navigationController1, viewController2]; // was #[viewController1, viewController2];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
This a relatively easy way to start a NIB-based tabbed application. You can then customize from there.
Personally, I struggle to imagine why someone would use NIBs rather than storyboards (unless you're trying to support iOS 4), but hopefully this illustrates both techniques.
current version of my project :
I have 5 different UIViewControllers in my app. I've set my
FirstViewController to be the Initial View Controller using the
Attributes Inspector. I move back and forth from one ViewController to
another by using buttons to which I assign modal segues, from one
ViewController to another, using the StoryBoard
What I want to change:
I want to keep the navigation buttons obviously, delete the modal segues and use
a UINavigationController instead. If I understand the concept
correctly, when using a UINavigationController I need to go into each
UIButton-IBAction and at the very end of the method I have to push the next
ViewController I want to move to, onto my NavigationController (do I also
have to pop the current one first?). However, I can't figure out how
to implement all that correctly.
What I've done so far:
I removed all modal segues from the storyboard and kept the navigation buttons along with their corresponding IBActions
I unchecked the box in the Attributes Inspector that was making my FirstViewController the initial View Controller of my app
I went into my AppDelegate.m and tried to create the Navigation Controller there and make my FirstViewController be the RootViewController
MyAppDelegate.m
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UIViewController *myFirstViewController = [[FirstViewController alloc] init];
UINavigationController *myNavigationController = [[UINavigationController alloc] initWithRootViewController:myFirstViewController];
[myNavigationController pushViewController:myFirstViewController animated:YES];
// Override point for customization after application launch.
return YES;
}
I then tried to test if the above was working by going into the IBAction of a
navigation button on my FirstViewController and implemented the
following in order to move to my SecondViewController when the
button is pressed :
FirstViewController.m
- (IBAction)goRightButton:(UIButton *)sender
{
// some code drawing the ButtonIsPressed UIImageView on the current View Controller
UIViewController *mySecondViewController = [[SecondViewController alloc] init];
[self.navigationController pushViewController:mySecondViewController animated:YES];
}
but nothing happens. What am I doing wrong ?
You are not linking your XIB file. Please add your navigation controller as
UIViewController *myFirstViewController = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:myFirstViewController];
Use following code to move from one view to another
UIViewController *mySecondViewController = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
[self.navigationController pushViewController:mySecondViewController animated:YES];
If you are using a storyboard, you should just drag in the navigation controller there and hook it up to your app delegates. As long as it is the main storyboard, and you have identified a view controller to load first, you do not need to load any views in your app delegate.
In order to push a view programmatically that's in a storyboard, you need to do something like the following:
//bundle can be nil if in main bundle, which is default
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
MyCustomViewController *customVC = (MyCustomViewController *)[mainStoryboard instantiateViewControllerWithIdentifier:#"customVC"];
//standard way
[self.navigationController pushViewController:customVC animated:YES];
//custom animation
[UIView transitionWithView:self.navigationController.view duration:0.5 options:UIViewAnimationOptionTransitionCurlUp animations:^{
[self.navigationController pushViewController:customVC animated:NO];
} completion:nil];
You identify the view controller with the identifier you add in the storyboard editor. Below are some screenshots to help show what I mean.
i'm having trouble with a navigation Controller, when i'm pushing my view controller to an xib a see a UITabbar but in mij xib where i'm pushing the view to i'm doing this to push the xib where i'm pushing to, to another file but when i use this line of code the UITabbar doesn't show up.
What i'm doing in view controller 1 i check if a JSON file contains 0,1 or 2 items when it's for example '1' item in the JSON i would like to push the view controller to a file special for the '2 item file' i'm pushing on this way:
UIViewController *rootController =
[[2ViewController alloc]
initWithNibName:#"2ViewController" bundle:nil];
navigationController = [[UINavigationController alloc]
initWithRootViewController:rootController];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
But when i do that the UITabbar disappear 'under' the view controller. Could somebody help me out solving this problem please?
you set set navigationController into UITabBarController.
Like
//Add to tabbars.
NSArray* controllers = [NSArray arrayWithObjects:navigationController, nil];
myTabBarController.viewControllers = controllers;
Supposed you've got:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *rootViewController = [[UIViewController alloc] init];
rootViewController.view.backgroundColor = [UIColor whiteColor];
[self.window setRootViewController:rootViewController];
[self.window makeKeyAndVisible];
UINavigationController *modal = [[UINavigationController alloc] initWithRootViewController:[[PTFrontViewController alloc] init]];
modal.modalPresentationStyle = UIModalPresentationFormSheet;
[rootViewController presentViewController:modal animated:YES completion:NULL];
return YES;
}
whereas PTFrontViewController and PTBackViewController view controllers have nothing interesting for sake of this example.
How could you push an instance of PTBackViewController from PTFrontViewController animating as in UIViewAnimationTransitionFlipFromLeft or UIViewAnimationTransitionFlipFromRight?
I am already well aware of these three things:
this is not exactly how you should make use of presentViewController
there is a good reason for UINavigationController's default animation
there are several answers how to "customize" UINavigationController's default animation while pushing and poping, but if you try the code for your self you will notice that when a view controller is presented via presentViewController there are drop shadows and background views that won't get animated correctly
So please answer taking these things in mind. Thank you.
First - forget UINavigationController. If you don't need the default animation, just put a UINavigationBar into your controllers. It will get a little easier.
Second - this is a difficult problem, you can't create such an animation only within the modal controller because the background wouldn't be repainted.
Sincerely, the easist solution I see is too forget the modal controller and just add the view controller as a child of your root controller. Then you can control all the animations but you have to write everything by yourself (including the background fading).
I have a UINavigationController setup in my AppDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Add the navigation controller's view to the window and display.
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}
In my RootViewController I am pushing another view onto the stack:
//Show the deals
DealViewController *dvc = [[DealViewController alloc] initWithNibName:#"DealViewController" bundle:nil];
[self.navigationController.navigationBar setHidden:NO];
[self.navigationController pushViewController:dvc animated:YES];
The view shows up, but there is no back button that is added to my navigation bar. Why is this and how can I resolve it?
Are you setting self.title in RootViewController? Perhaps the UINavigationController doesn't have any text to put on the back button, so it omits it...?
Are you setting hidesBackButton = YES or backBarButtonItem = nil in DealViewController, or does it have a different leftBarButtonItem defined?
Try this:
DetailViewController *detailViewController = [[DetailViewController alloc] init];
UIBarButtonItem *back = [[UIBarButtonItem alloc] initWithTitle : #"Back"
style : UIBarButtonItemStyleDone
target : nil
action : nil];
self.navigationItem.backBarButtonItem = back;
[self.navigationController pushViewController : detailViewController animated : YES];
[detailViewController release];
You must think of the navigation controller as a stack of navigation controllers each controlling one screen full of information.
You instantiate the navigation controller with the
-(id)initWithRootViewController:(UIViewController *)rootViewController
method. You specify the root view controller in this call. Then you add the navigation controller's view as a subview to the window, like you did before.
If you want to show your second screen you push another view controller on the stack by using
-(void)pushViewController:detailViewController animated:YES
method.
Using presentModalViewController to show the naviagtionController. Set the navagitionController bar button like so:
[navigationController.navigationBar.topItem setLeftBarButtonItem:
[[[UIBarButtonItem alloc] initWithTitle: #"Back"
style: UIBarButtonItemStylePlain
target: self
action: #selector(dismisstheModal:)] autorelease]];
This happened to me because in my navigation controller's content controller I had set up some navigation controller behavior in viewDidLoad and in another class that inherits from my content controller, and the one that was being presented, i implemented a viewDidLoad as well, and forgot to call [super viewDidLoad] which thereby caused me to override the base class's viewDidLoad where I was setting up my navigation controller buttons. Oooops.