I'm having a problem making a universal app... In the application delegate I set up the main navigation for ipad and iphone:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
window = [[UIWindow alloc] initWithFrame:[ [UIScreen mainScreen] bounds]];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
// The device is an iPad running iPhone 3.2 or later.
[self putSplitView];
} else {
[self putTabBar];
}
[window makeKeyAndVisible];
return YES;
}
- (void)putSplitView {
RootiPadViewController *rootiPadViewController = [[RootiPadViewController alloc] init];
UISplitViewController *splitController = [[UISplitViewController alloc] init];
splitController.viewControllers = [NSArray
arrayWithObjects:rootiPadViewController.seccionesView,
rootiPadViewController.noticiasView,
nil];
[window addSubview:splitController.view];
}
- (void)putTabBar {
TabBarController *tabBar = [[TabBarController alloc] init];
[window addSubview:tabBar.view];
}
RootiPadViewController is in charge of loading data an generating the panes for the splitView, so that its initialization incorporates a modalView with a loader, such that:
#implementation RootiPadViewController
#synthesize seccionesView, noticiasView;
- (id)init {
if ((self = [super init])) {
SeccionesVC_iPad *sec = [[SeccionesVC_iPad alloc] init];
NoticiasVC_iPad *not = [[NoticiasVC_iPad alloc] init];
self.noticiasView = not;
self.seccionesView = sec;
Init *initVC = [[Init alloc] init];
[self presentModalViewController:initVC animated:YES];
}
return self;
}
The code compiles without warnings, but for some reason the loadView method of initVC is never called and the modal view doesn't appear...
Any ideas why this might be happening?
thanks for your help!
Antonio
I know this is last year's question, but while I think I found the cause, I'm still trying to figure out a good non-hack solution for dealing with this.
Assuming you're working for iPad:
Upon initialization, splitViewController Master's viewDidLoad is called first, then the Detail's viewDidLoad.
If you attempt to put a modal window initializer in the Master's viewDidLoad, nothing seems to happen: This is because the Detail's viewDidLoad has executed after your modal view's viewDidLoad, resulting in your modal view being hidden away.
Breakpointing the modal view class, I see it enter initWithNibName in the modal view. I don't use ARC and here I assume your modal view doesn't dealloc until the program quits - The modal view is still there, but there's no way to get to it.
In iPhone:
Disregard this - because there is NO splitViewController for the iPhone. In fact, the default Universal splitViewController project treats the Master and Detail view as separate pages. So at application init, all you have to worry about is the Master viewDidLoad.
This is why, in a Universal project, pushing a modal view in viewDidLoad works as intended in the iPhone emulator, but NEVER in the iPad emulator.
Note that this only applies during the viewDidLoad stage; if you push a modal view AFTER viewDidLoad into the Master window, the modal view works as intended.
Maybe you should present your modal ViewController from the RootViewController 'ViewDidLoad' method, instead of the 'init' method... Not sure the view hierarchy is created that soon
Related
I am trying to convert my iPhone only application to a Universal application. I switched the devices to Universal and let Xcode do it's thing making a MainWindow-iPad.xib for me, and now when I run the app in the iPhone simulator it works fine, but when I run it in the iPad simulator I get a white screen and the Application windows are expected to have a root view controller at the end of application launch error. I have read some other posts about this same problem but none of them are just limited to one device.
Here is my application:didFinishLaunchWithOptions: method:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
/* some dropbox setup stuff */
// INIT VIEW AND CORE DATA
RootViewController *rootViewController = [[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
NSManagedObjectContext *context = [self managedObjectContext];
if (!context) {
// Handle the error.
}
rootViewController.managedObjectContext = context;
UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
self.navigationController = aNavigationController;
[_window addSubview:[_navigationController view]];
[_window makeKeyAndVisible];
[rootViewController release];
[aNavigationController release];
return YES;
}
EDIT: I just have one root view controller that is sized for iPhone called RootViewController. But it should still load in shouldn't it? Or if it shouldn't how do I create one for iPad?
Change the following line:
[_window addSubview:[_navigationController view]];
to:
_window.rootViewController = _navigationController;
or, if you need iOS 3 compatibility:
if ([_window respondsToSelector:#selector(setRootViewController:)]) {
_window.rootViewController = _navigationController;
} else {
[_window addSubview:_navigationController.view];
}
You need to create a RootViewController with the xib file for iPad, otherwise you will get this error. Below are the template code provided by Xcode for universal app. If you debug the app in iPad simulator and point the debugger to run create the view controller with iPhone xib file, you will see the exact error.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[SYKViewController alloc] initWithNibName:#"SYKViewController_iPhone" bundle:nil];
} else {
self.viewController = [[SYKViewController alloc] initWithNibName:#"SYKViewController_iPad" bundle:nil];
}
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
In iOS 4 and later, UIWindow has the settable property rootViewController. This is the UINavigationController that pushes the UIViewController displayed on application launch. In Xcode IB, selecting Initial Scene: Is initial view controller for the UINavigationController sets everything up with no code required.
From the generated MainWindow-iPad.xib, in Interface Builder, add a View Controller object in IB, as well as an Object underneath the View. For the object, set it's class to AppDelegate, for the View Controller, set the class to ViewController (i the Identity Inspector) and specify the nib name in the Attributes Inspector. You can look at the MainWindow.nib for the device you were converting from to see the differences.
Edit: I forgot to mention some important steps. You will also need to set the File's Owner class to "UIApplication" in IB, and set the referencing outlets appropriately for the App Delegate and View Controller. Again, in IB, it's easiest to look at the Connections Inspector for the MainWindow nib you had and emulate it. If you have another nib specific to the iPad, other than MainWindow-iPad.nib (i.e. ViewController-iPad.nib), be sure to select it's File's Owner and point it to the view and set it's class appropriately too.
I tried your suggestions but none of them worked for me, sorry. :/ I ended up just making the view manually in code without interface builder:
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
// Setup view for iPad
} else
// Setup view for iPhone and iPod Touch
}
which I thought would be a lot harder than it actually was.
Note that if you use this method you can still hook up everything in interface builder and just change the frame of objects in these blocks if you are going to have the same objects on both iPhone and iPad.
I created a UIImagePickerController in the viewDidLoad method in my rootViewController.
- (void)viewDidLoad {
[super viewDidLoad];
UIImagePickerController *pickerController=[[UIImagePickerController alloc] init];
pickerController.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum;
pickerController.delegate=self;
[self presentModalViewController:pickerController animated:YES];
[pickerController release];
}
But the view of UIImagePickerViewController didn't appear on the screen.
The SDK version is 4.3
Is there some mistakes i make?
Thanks!
viewDidLoad is called after the view has been loaded and before the view is displayed. viewDidAppear: is called when the view is onscreen and is the correct point to present a modal view controller.
And if you want to do it only once, you might want to consider using a BOOL to keep track of it.
Folks,
New to iPhone development so I greatly appreciate your help. I have been looking at documentation and trying many things to get my navigation controller functionality working but can't.
Here's the situation. I have an app delegate which sets its root controller to be a navigation controller:
- (BOOL)application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window.rootViewController = self.mainViewController.navController;
[self.window makeKeyAndVisible];
return YES;
}
The navigation controller is a property of the mainviewcontroller because I intend to take the user to a map view (associated with a mapviewcontroller) only when they select an item in a tableview owned by mainviewcontroller. I can't yet think of a graceful way to notify the appdelegate about a table row selection, hence I am trying to handle this in the mainviewcontroller.
In the mainviewcontroller init function:
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
// Custom initialization
navController = [[UINavigationController alloc] initWithRootViewController:self];
mapController = [[MapViewController alloc] init];
}
return self;
}
In mainview controller, when the user selects an item from the tableview, I call:
[self.navController pushViewController:mapController animated:YES];
The view associated with my mapviewcontroller never appears. Any ideas what's going on?
Thanks
Add this
[self.window addSubview:self.mainViewController.navController.view];
Before
[self.window makeKeyAndVisible];
I have been figuring out this since yesterday but have not got that correct yet.
I have added the modalviewcontroller for my loading view controller on top of my tab bar controller and it works fine.
Added the code in app Delegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions {
[navController.navigationBar setTintColor:[UIColor blackColor]];
[window addSubview:rootController.view];
[window makeKeyAndVisible];
LoadingViewController *lvc = [[LoadingViewController alloc] initWithNibName:#"LoadingView" bundle:nil];
// Delegate added here
lvc.loadingDelegate = self;
[rootController presentModalViewController:lvc animated:YES];
[self URL];
[lvc release];
return TRUE;
}
Now I do my parsing and when its done I call the following code in different view name XMLParsingView.m where the parsing got over.
- (void)handleLoadedApps
{
LoadingViewController *loading = [[[LoadingViewController alloc] init] autorelease];
//delegating to let the load view controller know to dimiss itself by defining disappear method in protocol
[loading.loadingDelegate disappear];
}
and in loading view controller I have method which calls dismissModalViewControlAnimated:
-(void)disappear{
[activity stopAnimating];
[activity removeFromSuperview];
[self removeFromSuperview];
[self dismissModalViewControllerAnimated:YES];
}
But for some reason it will never remove the view and not load it back to my tab bar controller.
Really need help here if any one have come across such issues.
Sagos
In your code you seem to create, without a nib, a new LoadingViewController and immediately go and dismiss it. In your app delegate you create your first loadingViewController with a nib, present it modally on rootController and then release it. Since you want to dismiss it outside your app delegate you have
3 choices, (hardest to fastest and most sane)
a) Key-Value-Observing on a property of XMLParsingView from LoadingViewController to remove itself when the task finishes.
b) Use delegation to inform the LoadingViewController when the task finishes to dismiss itself.
c) Fetch your rootController from your [[UIApplication sharedApplication] delegate], which means you must expose rootController as a property or through a method, and make rootController dismiss your modal.
You need to call dismissModalViewControllerAnimated on the rootViewController, not the loading view controller.
I am very new to Obj-C and learning iphone development.
My question is how to add subview from app delegate.
Lets say I added subview called "MainView" from "applicationDidFinishLaunching" method.
- (void)applicationDidFinishLaunching:(UIApplication *)application {
MainViewController *aViewController = [[MainViewController alloc] initWithNibName:#"MainView" bundle:nil];
self.mainViewController = aViewController;
[aViewController release];
[window addSubview:mainViewController.view];
// Override point for customization after application launch
[window makeKeyAndVisible];
}
"MainView.xib" file has a button to show its child view. When the button is clicked, it calls "showChildView" method.
- (IBAction)showChildView:(id)sender {
if (self.childViewController == nil) {
ChildViewController *childController = [[ChildViewController alloc] initWithNibName:#"ChildView" bundle:nil];
self.childViewController = childController;
[childController release];
}
[self.view insertSubview:childViewController.view atIndex:0];
}
From this code, when app launches, it shows "MainView" with a button. But when I clicked the button, the button is still visible as well as the content from the "ChildView.xib" file too.
How can I hide the "MainView" when I pressed the button and show only the contents of the "ChildView"?
Thanks for your help in advance.
well, you have to remove the original view first, before inserting the new subview, do it this way
- (IBAction)showChildView:(id)sender {
if (self.childViewController == nil) {
ChildViewController *childController = [[ChildViewController alloc] initWithNibName:#"ChildView" bundle:nil];
self.childViewController = childController;
[childController release];
}
[self.mainViewControlle.view removeFromSuperView];
[self.view insertSubview:childViewController.view atIndex:0];
}
Hope this helps.
You might want to check out the Utility App sample -- it demonstrates switching between two views with animation and adding/removing views from parent views.
you might want to create a navigation controller in the main view and than push the childviewcontroller onto it when invoking showChildView. You'll get the back navigation button for free that way