Im my application I have the following code, the first bit runs when my application launches, and it presents a login screen in a modal view. With my rootController added to the window before that.
The Modal view will allow a user to log on, view terms and conditions and then if they accept the loadMainApp function is called.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
rootController.delegate = self;
[window addSubview:rootController.view];
LoginViewController *_loginViewController = [[LoginViewController alloc] initWithNibName:#"LoginView" bundle:[NSBundle mainBundle]];
self.loginViewController = _loginViewController;
[_loginViewController release];
UINavigationController *navi = [[[UINavigationController alloc]initWithRootViewController:loginViewController]autorelease];
navi.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[loginViewController release];
[rootController presentModalViewController:navi animated:YES];
[self.window makeKeyAndVisible];
return YES;
}
This next bit is called when the user accepts terms and conditions:
-(void)loadMainApp:(UIView *)fromView{
[fromView removeFromSuperview];
[window addSubview:rootController.view];
rootController.selectedIndex = 2;
rootController.delegate = self;
}
From here I want to be able to use the people picker which is a modal view and I attempt it with this code:
ABPeoplePickerNavigationController *picker =
[[ABPeoplePickerNavigationController alloc]init];
picker.peoplePickerDelegate = self;
[rootController presentModalViewController:picker animated:YES];
[picker release];
But nothing happens, when I try to present a modal view from my rootController nothing displays.
This appears to occur after this code in applicationDidFinishLaunching is run:
LoginViewController *_loginViewController = [[LoginViewController alloc] initWithNibName:#"LoginView" bundle:[NSBundle mainBundle]];
self.loginViewController = _loginViewController;
[_loginViewController release];
UINavigationController *navi = [[[UINavigationController alloc]initWithRootViewController:loginViewController]autorelease];
navi.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[loginViewController release];
[rootController presentModalViewController:navi animated:YES];
[self.window makeKeyAndVisible];
return YES;
If I dont display the login screen at all and instead just add my rootController
rootController.delegate = self;
[window addSubview:rootController.view];
in the applicationDidFinishLaunching function then everything works fine when I go to display the people picker.
Is there something fundamental that I am breaking here or can anyone spot what I may be doing wrong?
Are you dismissing the first modal view controller correctly, via thedismissModalViewControllerAnimated: method? If you're just removing the modal view controller's view from its superview, then probably a lot of paperwork is being left undone by UIKit.
What you should really do is something like this:
Add rootViewController to navigationController. Then add navigationController to the window.
In rootViewController's viewDidLoad method, set loginViewController's delegate to rootViewController and display the LoginViewController's instance as a modal.
When you are done with terms acceptance, do [delegate loginViewControllerFinished];.
Now in rootViewController, handle the loginViewControllerFinished method. This should contain a call to [self dismissModalViewControllerAnimated:YES]; to close the login modal view. Then you should launch ABPeoplePickerNavigationController as a modal view.
In AppDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Make sure rootViewController is initiated by this point.
UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:rootViewController] autorelease];
[window addSubview:rootController.view];
[self.window makeKeyAndVisible];
return YES;
}
In RootViewController:
- (void)viewDidLoad {
[super viewDidLoad];
LoginViewController *loginViewController = [[[LoginViewController alloc] initWithNibName:#"LoginView" bundle:nil] autorelease];
loginViewController.delegate = self;
loginViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:loginViewController animated:YES];
}
- (void)loginViewControllerFinished {
[self dismissModalViewControllerAnimated:YES];
// Here we are closing one modal. And showing another after that.
ABPeoplePickerNavigationController *peoplePicker = [[[ABPeoplePickerNavigationController alloc] init] autorelease];
peoplePicker.peoplePickerDelegate = self;
[self presentModalViewController:peoplePicker animated:YES];
}
In LoginViewController:
// Make sure LoginViewController has delegate property in header.
// #property (nonatomic, assign) id delegate;
// And put this in implementation (.m) file. #synthesize delegate.
// Don't put release for delegate, since it's not retained. It's only 'assigned'.
- (void)done {
// Call this when you want to close loginViewController.
[delegate loginViewControllerFinished];
}
Hope this helps.
Related
I am trying to create a back button to return to the main menu of my app, what is happening now, is, once I press the back button, it shows the main menu, but then the app crashes out a second later.
The code I use for back button is;
- (void)backButtonPressed:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
}
From the AppDelegate.m file
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[[MenuViewController alloc] initWithNibName:#"MenuViewController_iPhone" bundle:nil] autorelease];
} else {
self.viewController = [[[MenuViewController alloc] initWithNibName:#"MenuViewController_iPad" bundle:nil] autorelease];
}
navigationController = [[myNavigationViewController alloc] initWithRootViewController:self.viewController];
navigationController.navigationBarHidden = YES;
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
return YES;
}
I cannot see where I am going wrong? It seems to call the right screen, yet crashes straight after?
EDIT - Here is MenuViewController.m file;
#import "MenuViewController.h"
#import "MagicAppDelegate.h"
#import "MagicViewController.h"
#interface MenuViewController ()
#end
#implementation MenuViewController
- (void)viewDidLoad
{
self.view.frame = [[UIScreen mainScreen] bounds];
[super viewDidLoad];
// [self initLoad];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)onStart:(id)sender
{
MagicViewController* viewController;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
viewController = [[MagicViewController alloc] initWithNibName:#"MagicViewController_iPhone" bundle:[NSBundle mainBundle]];
else
viewController = [[MagicViewController alloc] initWithNibName:#"MagicViewController_iPad" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
}
- (void)dealloc {
[super dealloc];
}
#end
Please use below code,do u want go mainmenuview controller.
[self.navigationController popToRootViewControllerAnimated:YES];
Actually, I don't understand your code: In the statement navigationController = [[myNavigationViewController alloc] initWithRootViewController:self.viewController]; you are sending an alloc to something that seems to be the instance of class UINavigationController, but alloc is a class method. I therefore assume myNavigationViewController is a subclass of UINavigationController (but then is should start with a capital letter).
The new instance returned is then assigned directly, i.e. without using a setter method, to variable navigationController. It is therefore not retained. If your statement returns an autorelease object, it will thus be released as soon as the program returns to the main event loop.
Try thus to use thus a setter method, i.e. self.navigationController = [[myNavigationViewController alloc] initWithRootViewController:self.viewController];
I have programatically created a TabBarController with views etc. Now i want to show this TabBarController on Button Press. How do i do that? Currently i am presenting it modally but it doesn't work - throws sigtrap errors.
This is my code for the TabBarController
#implementation TabBarViewController
- (void) loadView
{
HomeViewController * homeViewController = [[HomeViewController alloc]initWithNibName:#"HomeViewController" bundle:nil];
UITabBarController *tabBarController = [[UITabBarController alloc] init];
tabBarController.view.frame = CGRectMake(0, 0, 320, 460);
// Set each tab to show an appropriate view controller
[tabBarController setViewControllers:[NSArray arrayWithObjects:homeViewController, homeViewController, nil]];
[self.view addSubview:tabBarController.view];
[homeViewController release];
[tabBarController release];
}
This is my code for accessing this tabBarController from a Button Press event from my mainViewController -
- (IBAction)quickBrowse:(UIButton *)sender
{
TabBarViewController * tabBarController = [[TabBarViewController alloc]init];
[self presentModalViewController:tabBarController animated:YES];
[tabBarController release];
}
You should only override the method loadView if you are not using IB and if you want to create yours view manually. And when you do that you must assign your root view to the view property of UIViewController.
I believe in your case you don't need to override this method, you can use the viewDidLoad method to create your UITabBarController and store it in a variable, so when the event gets called all you need to do is pass the variable to the method presentModalViewController:animated:
Your final code would look like this:
- (void) viewDidLoad
{
[super viewDidLoad];
HomeViewController * homeViewController = [[HomeViewController alloc]initWithNibName:#"HomeViewController" bundle:nil];
// you can't pass the same view controller to more than one position in UITabBarController
HomeViewController * homeViewController2 = [[HomeViewController alloc]initWithNibName:#"HomeViewController" bundle:nil];
// local variable
self.modalTabBarController = [[UITabBarController alloc] init];
// Set each tab to show an appropriate view controller
[self.modalTabBarController setViewControllers:[NSArray arrayWithObjects:homeViewController, homeViewController2, nil]];
}
- (void)viewDidUnload
{
self.modalTabBarController = nil;
[super viewDidUnload];
}
- (IBAction)quickBrowse:(UIButton *)sender
{
[self presentModalViewController:self.modalTabBarController animated:YES];
}
This is a view based application.
in delegate.m file I have done like this to launch login screen initially:
- (void)applicationDidFinishLaunching:(UIApplication *)application
{
[window addSubview:viewController.view];
[window makeKeyAndVisible];
LoginView *loginView=[[LoginView alloc]initWithNibName:#"LoginView" bundle:nil];
[window addSubview:loginView.view];
}
By adding the above code I have launched login screen sucessfully, but at the bottom of my login screen I can see a space left out.
How can the tab bar controller get launched after sucessful login?
i have creatd a method called login in my LoginView.m file:
-(void)login
{
if(login)
{
TabBarController *tabBarController = [[TabBarController alloc] initWithNibName:#"TabBarController" bundle:nil];
[self.view addSubView: aTabBarController.view];
}
[aTabBarController release];
Please help me out of this with the appropriate code.
you have to create on method in appDelegate like.. and In appDelegate.h you have to create an object like this
UITabBarController *Obj_tabbar;
and then in .m file,
-(void) switchToTabbarController
{
Obj_tabbar.delegate = self;
Obj_tabbar.selectedIndex = 0;
Tracking_HomeVC *obj = [[Tracking_HomeVC alloc]init];
[self tabBarController:Obj_tabbar didSelectViewController:obj];
[self.window addSubview:Obj_tabbar.view];
}
// At this point Tracking_HomeVC is the first view controller of the TabbarController. and it will be added on window.
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
if([tabBarController selectedIndex] == 0)
{
//Write your code here to do with the first view controller object.
}
}
and then call it from your LoginView like..
-(void)LoginPressed
{
AppAppDelegate *delegate =(AppAppDelegate *) [[UIApplication sharedApplication] delegate];
[delegate switchToTabbarController];
}
Your login view (or it's controller if you have one which it looks like you don't) should tell the appDelegate to swap the RootViewController to be a taBarController. You do NOT want the loginview to be trying to add a tabBar as a child of itself.
One way of doing it is creating a tabbarcontroller like normal in your appdelegate and set it as rootviewcontroller:
TOTabBarController *tabBarController = [[TOTabBarController alloc] init];
UIViewController *vc1 = [[UIViewController alloc] initWithNibName:nil bundle:nil];
UIViewController *vc2 = [[UIViewController alloc] initWithNibName:nil bundle:nil];
UIViewController *vc3 = [[UIViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *vc2_nc = [[UINavigationController alloc] initWithRootViewController:vc2];
UINavigationController *vc3_nc = [[UINavigationController alloc] initWithRootViewController:vc3];
NSArray *viewControllers = [NSArray arrayWithObjects:vc1, vc2_nc, vc3_nc, nil];
[tabBarController setViewControllers:viewControllers];
//set tabbarcontroller as rootviewcontroller
[[self window] setRootViewController:tabBarController];
Then display the login screen modally (without animation) if the user is not logged in:
if (not logged in) {
UIViewController *lvc_nc = [[UIViewController alloc] init];
[[[self window] rootViewController] presentModalViewController:lvc_nc animated:NO];
}
Hope that helps!
I am building an app that has a login screen that leads to a tabbar. I followed this example on how to push a modal view once you launch the app (as the "sign in" page) and then dismiss it.
Example --> Show / Hide tab bar
From some reason, it's not really working - when I launch the app, I see the tabbar view with the two view controllers. no sign in page.
here is my code:
AppDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIViewController *viewController1 = [[FirstTab alloc] initWithNibName:#"FirstTab" bundle:NSBundle.mainBundle];
UIViewController *viewController2 = [[SecondTab alloc] initWithNibName:#"SecondTab" bundle:NSBundle.mainBundle];
UINavigationController *secondNavController = [[UINavigationController alloc]initWithRootViewController:viewController2];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, secondNavController, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
My first tab (which is where I understand all this modal view business needs to happen)
.h
#interface FirstTab : UIViewController
#end
.m
//UPDATED CODE PER COMMENT BELOW
- (void)viewDidLoad
{
[super viewDidLoad];
SignIn *loginview = [[SignIn alloc] initWithNibName:#"SignIn" bundle:nil];
UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController: loginview];
self.hidesBottomBarWhenPushed = YES;
[self presentModalViewController:controller animated:YES];
}
And of course, I dismiss the modal view in the SignIn view controller, though I never get there as I mentioned.
What am I doing wrong here? Thanks for the help!!
You could use :
[[self tabBarController] presentModalViewController:controller animated:YES];
since first viewController1 is your first tab, and self.navigationController might be nil.
In your custom view controller subclass called SignIn implement initWithNibName:bundle: instead if init.
-(id)initWithNibName:(NSString *)nibNameOrNil
bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// init here
}
}
Now when init/alloc it call either :
SignIn *loginview = [[SignIn alloc] initWithNibName:#"SignIn" bundle:nil];
if your interface is in a NIB file, or :
SignIn *loginview = [[SignIn alloc] initWithNibName:nil bundle:nil];
if there no NIB.
Also why putting it as a root view controller of any navigation controller ? unless you need to go deeper in some model data presentation, just present it directly :
// why ?
//UINavigationController *controller = [[UINavigationController alloc]
// initWithRootViewController: loginview];
//self.hidesBottomBarWhenPushed = YES;
//[self presentModalViewController:controller animated:YES];
[self presentModalViewController:loginView animated:YES];
You have to include this in your code,
yourModelController =[[Yourmodelcontroller alloc]init];
UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController: yourModelController];
self.hidesBottomBarWhenPushed = YES;
[[self navigationController] presentModalViewController:controller animated:YES];
[controller release];
hope this will help you out.
I've encountered issues where modals don't like showing from viewDidLoad. Try adding your code to your viewWillAppear and it should show.
How can I navigate from one page to another page in xcode? remember without using the interface builder... I want the answer programmatically?
Pls be more precise if you want to get what you want.
If you are using view controllers within navigationcontroller you can make use of its pushViewController: or presentModalViewController:. Or if you just want to show another view you can just add the next view to existing view as subview.
Although your question is not much clear but still I would like to give a try...
You can use
UIViewController *yourViewController = [[YourViewControllerClass alloc] initWithNibName:#"<name of xib>" bundle:nil];
[self presentModalViewController:yourViewController animated:YES];
[yourViewController release];
In case the new view is also to be created programmatically, you can do that in the viewDidLoad method of YourViewControllerClass and change the initialization to
UIViewController *yourViewController = [[YourViewControllerClass alloc] init];
In YourViewController when you wish to come back to previous view on some button action you can use
[self dismissModalViewControllerAnimated:YES];
Another way that you can do is
UIViewController *yourViewController = [[YourViewControllerClass alloc] init];
[self addSubview:[yourViewController view]];
and to remove the view you can use
[self.view removeFromSuperview];
Hope this works for you, if yes please communicate....:)
//Appdelegate.m
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
UINavigationController *navigation = [[UINavigationController alloc]initWithRootViewController:self.viewController];
self.window.rootViewController = navigation;
[self.window makeKeyAndVisible];
return YES;
}
//In viewcontroller1.M
- (IBAction)GoToNext:(id)sender
{
ViewController2 *vc2 = [[ViewController2 alloc] init];
[self.navigationController pushViewController:vc2 animated:YES];
}