I'm working in Xcode 4.3.2
I implemented Local Notifications that alert the user of a new event at a predetermined time. So when my app is in the background and the clock strikes 8 am (for instance), the user will get a notification from my app.
When the user decides to view the app from the background I load a nib. Currently, this nib works properly: it shows the view as it was it arranged in the nib. However, after the nib is shown to the user, I want to forward the user to a different view in the LocalNotificationsHandler.m. When I attempt to push the second view, my app fails. So while there isn't an error message, it seems the second nib will not load.
In short the flow goes as follows:
user gets notification while my app is running in the background
user chooses to view the app
the LocalNotificationsHandler nib will load
self.navigationController == nil (in LocalNotificationsHandler.m)
self.navigationController will not "[pushViewController: "new view" animated:YES]" to get a new view
I'm wondering if there is something I'm missing from my AppDelegate.m file so I've included
"didFinishLaunchingWithOptions" from my AppDelegate.m file:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
// Add the navigation controller's view to the window and display.
NSLog(#"did finish launching with options");
[self.window addSubview:tabBarController.view];
[self.window makeKeyAndVisible];
[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound)];
if (self.locationManager == nil)
{
locationManager = [[CLLocationManager alloc] init];
locationManager.purpose = #"We will try to use you location";
}
if([CLLocationManager locationServicesEnabled])
{
[self.locationManager startUpdatingLocation];
}
self.navigationController.navigationBar.tintColor = nil;
return YES;
}
You are using the outdated (since iOS 3) method of adding the viewcontroller's view to the main UIWindow. That should be looking like this:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// create properly sized window
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// create instance of root VC and assign to window
MainViewController *vc = [[MainViewController alloc] init];
self.window.rootViewController = vc;
[vc release];
[self.window makeKeyAndVisible];
return YES;
}
The navigationController property of a view controller is ONLY set if it is actually presented from a UINavigationController.
See this writeup for more information: http://www.cocoanetics.com/2012/11/revisited/
Related
I need to show "Loading screen" (just an image) at the start of application and when application gets all needed data from web, then first viewcontroller is shown. I have succeded doing it by setting my own black screen "Default.png" as "LoadingScreen.png" (Of course named again as Default.png) and
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[THWViewController alloc] initWithNibName:#"THWViewController" bundle:nil];
[self performSelector:#selector(start) withObject:nil afterDelay:5.0];
[self.window makeKeyAndVisible];
return YES;
}
- (void)start
{
self.window.rootViewController = self.viewController;
}
I would change that random delay to when api loading is finished, but is this a good way of implementing it ? Because i get that message that rootviewcontroller is expected.
You might want to consider using a block so you can eliminate that random delay. I would also consider calling this from your first view rather than starting with no root (remove the warning):
//show your loading screen over your first view
dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Get all the needed data
dispatch_async( dispatch_get_main_queue(), ^{
// do what you need to do with data and in first view
//hide the loading screen
});
});
I have implemented push notifications and am attempting to take the user to another view controller (opposed to just opening the app) when they tap the notification. I was going off of the apple website example but have not had any luck yet.
It seems that it never even enters my code as it should. I tried putting an NSLog to prove that and I was right.
Does anyone know why? The view controller I want implemented is called statsViewController.
Thanks
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
NSDictionary *remoteNotif = [launchOptions objectForKey: UIApplicationLaunchOptionsRemoteNotificationKey];
if (remoteNotif) {
NSLog (#"We are here now");
[self handleRemoteNotification:application userInfo:remoteNotif]; //custom method where View controller will be implemented
return YES;
}
[window addSubview:tabBarController.view];
[window makeKeyAndVisible];
return YES;
}
-(void) handleRemoteNotification:(UIApplication *)application userInfo:(NSDictionary *)userInfo {
application.applicationIconBadgeNumber = 0;
statsViewController* viewController = [[statsViewController alloc] init];
[navController pushViewController:viewController animated:YES]; //Don't think this is right since I never use it in didFinishLaunching... I simply just declared it delegate.h
[viewController release];
}
I have the following UI for an iPad app:
When I click on the Settings button, I want the dialog to horizontally flip to show the settings dialog.
I have this working fine. But, there is a background colour shown when the dailog flips over. As you can see:
Is there any way to not have this block of colour be visible as the dialogs flip? I'd like it to look more seamless -- as if it's a sheet of paper flipping over.
The views are essentially this:
Window
Main View. Set to the window's rootViewController
Login modal view
Thus the main window and root controller are setup as follows (in the app delegate class):
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[MainViewController alloc] initWithNibName:#"MainView" bundle:nil];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
The login window is setup and shown in the main view's viewDidAppear:
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
// Setup and show Login dialog
LoginViewController* controller = [[LoginViewController alloc] initWithNibName:#"LoginView" bundle:nil];
controller.delegate = self;
controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
controller.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:controller animated:YES];
}
And when the Settings button is pressed: showing the Settings modal view is done in pretty much the same way that the Login modal view was shown:
- (IBAction)settingsButtonPressed:(id)sender {
SettingsViewController *controller = [[SettingsViewController alloc] initWithNibName:#"SettingsView" bundle:nil];
controller.delegate = self;
controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
controller.modalPresentationStyle = UIModalPresentationCurrentContext;
[self presentModalViewController:controller animated:YES];
}
I don't think there's any way to do what you want using the modalPresentationStyle. You'll need to implement the animation yourself using a transition animation using the following method:
+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion
With the UIViewAnimationOptionTransitionFlipFromLeft option.
In this case the new view you want to flip is not the content of the modal (the controller.view) but the modal frame itself, so experiment with just calling the method above from your settings button, and instead of passing controller.view, substitute controller.view.superview, and if that doesn't work, try controller.view.superview.superview until the animation looks right.
It will require some tweaking to work out exactly how to do it.
I am new and am working on an exercise which involves starting with a navigation-based template. Since I am running Xcode 4.2 which no longer has that template, I have started with an empty application template, and then copied the directory structure of the completed app.
Since the empty app template starts only with an AppDelegate.h, .m files, I started adding other required files, including the MainWindow.xib, and the RootViewController.h, .m files. Did some tweaking of the #import directive so that it could see the right files, and could start alright.
However, when I try to run it on the iOS Simulator, I got this message: Applications are expected to have a root view controller at the end of application launch
Terminating in response to SpringBoard's termination.
Program ended with exit code: 0
What additional changes do I need to make so that the app can see the RootViewController?
Thank you.
In -[AppDelegate application:didFinishLaunchingWithOptions:], you need to set your window's rootViewController property.
You need to set the rootViewController property of AppDelegate's _window:
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
_window.rootViewController = self.myNavigationController;
[_window makeKeyAndVisible];
return YES;
}
To start a traditional navigation-based project in XCode 4.2, I find it easier to start with the single-view template. Then, in AppDelegate, I substitute the generated UIViewController with a UINavigationController.
self.window.rootViewController=self.yourviewControollerobj
You can set like this. First set the window bounds then add you navigation controller with root view controller.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
MainViewController *vc = [MainViewController new];
/*
* If you are using .xib you should create UIViewontroller like this
* MainViewController *vc = [MainViewController alloc] initWithNibName:#"MainViewController" bundle:nil]
*/
UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:vc];
[self.window setRootViewController:self.nc];
[self.window makeKeyAndVisible];
return YES;
}
MyViewController *rootCtr = [[MyViewController alloc] init];
[rootCtr.view addSubview:myView];
window.rootViewController = rootCtr;
i have created and ipad application.
i started off with window based application and added 2 view controllers(loginviewcontroller , detailviewcontroler ) . both have their own XIB'S. the added the loginviewcontroller object in in the appdelegate applicationdidfinishlaunch method , i wrote code to move back and forth between 2 views. Here is the code.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
Login *mylogin = [[Loginviewcontroller alloc] init];
[window addSubview:mylogin.view];
//detailview *tv=[[detailviewcontroller alloc] init];
// [window addSubview:tv.view];
[self.window makeKeyAndVisible];
return YES;
}
The problem is that the willrotatetointerfaceorientation method runs only from the loginviewcontroller class even if i am in the detailviewcontroller.
if i add the tickets view to the appdelegate then it runs the willrotatetointerfaceorientation method from detailviewcontroller , so in summary it runs the willrotatetointerfaceorientation method from only the object which was added to appdelegate.
how do i make the 2 view controllers run their respective willrotatetointerfaceorientation methods?
UIViewController has the method
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
override this method in your both viewcontroller classes(i.e. (loginviewcontroller , detailviewcontroler )
write this code
-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
//write your code which you want to during rotation
return Yes;
}
The rotation messages are being sent only to the controller of topmost view. You should forward them manually in appropriate methods.