my main application view load a UIVIewController for showing a disclaimer, user can or not accept, in a modal way.
The disclaimer UIVIewController has 2 buttons, 'agree' and 'disagree'.
If user clicks on 'disagree' the application close itself.
If user clicks on 'agree' the disclaimer UIVIewController close itself and the main application goes on.
The problem is that when i load the disclaimer UIViewController the main application goes on and not wait until the disclaimer UIViewController is discmissed.
There is a way to open a modal UIViewController in a 'synchronous way'?
Thank you.
so I am assuming that in your application delegate in the applicationDidFinishLaunching method you have a viewController whos view is automatically added to the window. Well inside the viewController class in the -(void)viewDidLoad method you should allocate the disclaimer controller and present it modally using
[self presendModalViewController:my_disclaimer animate:YES];
This will cause the controller to slide up in front of everything. If the user clicks no then simply leave that modal controller display locking them out of the application.
so the code inside your viewController -(void)viewDidLoad method should read
-(void)viewDidLoad
{
//Alocate memory
MyCustomController *controller = [[MyCustomController alloc] initWithWhatever:arguements_to_get_controller_setup];
//present controller
[self presentModalViewController:controller animate:YES];
}
Related
I am a newbie to iOS world and have started building custom code on top of a templated code.
So excuse me for the obvious.
The View chain starts with a MainWindow.xib which contains a App Delegate Object, a Window Object and Application ViewController. I dont understand why those objects are needed over there. But what I understand, I need to mention starting ViewController in the "Nib Name" Property to initiate my custom View Controller (called "EmptyViewController"). Its a dummy view controller, just there to avoid crash to happen as a result of missing valid viewcontroller.
I initiate a separate Modal View Controller(MainViewController) inside didFinishLaunchingWithOptions.
Code for initiating modal View Controller --
self.window.rootViewController = self.viewController;
mainView = [[MainViewController alloc] initWithNibName:#"MainViewController" bundle:nil];
// present the viewcontroller
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:mainView];
[self.viewController presentModalViewController:navController animated:NO];
// release it, because it's retained as modalViewController
[navController release];
I do not put this MainViewController inside MainWindow.xib as I want to have navigation at the root of MainViewController.
Inside MainViewController, I push HelpViewController when "help" button is pressed.
But HelpViewController does not show any navigation bar. I do not understand why?
Code for Pushing Navigation bar --
HelpViewController *helpVC = [[HelpViewController alloc] init];
[self.navigationController pushViewController:helpVC animated:YES];
[helpVC release];
So I would like to understand --
1) Why is MainWindow.xib needed? Can I remove it? (Note: I tried to remove it, but then I get blank screen)
1.a) Why are all the controls/objects App Delegate Object, a Window Object and Application ViewController objects needed?
2) Why doesnt HelpViewController show Navigation bar?
3) Another thing I noticed, if I say self.presentingViewController, EmptyViewController handle is returned while popViewController returns me back to MainViewController.
Thanks
The App Delegate simply implements some app-level 'callbacks' by which iOS communicates with your own code. In main.m you can see how iOS is told which of your classes implements UIApplicationDelegate. iOS creates an instance of this class and call these delegate methods ('callback') whenever appropriate (e.g. when the app goes to background).
The Window is something iOS provides, your app needs to tell what to display on it. And, as you saw, this is usually done in didFinishLaunchingWithOptions (which is called by iOS to inform your app things are ready to get started).
A View Controller is a class that handles states of stuff you show on the Window. You don't show stuff directly on the Window, but instead use Views. Every View Controller has a View with UI elements.
The XIB or NIB is a UI description/layout file. A XIB and View are linked together; you need to tell the XIB to which View Controller member (e.g. a UILabel) a UI element belongs, and you tell the XIB which View Controller method to call on a certain UI event (e.g. user taps on a button).
These are the basics. I'm aware it does not answer all your questions; I suggest you read the very good Apple documentation. Don't try to understand everything immediately as things, as you're experiencing, indeed can seem illogical at start.
I need to create an app which features a login/signup form and then a custom Google Map. I am new to iOS programming and trying to learn the things needed for this app very fast.
So, I have created the frontend and the backend of the login form, it works. I have an action which is triggered by the "Log in" button which verifies the credentials and either trigger a error either presents the Google Map.
I want to show that Google Map in another view controller which controls another xib file. I created the view controller and the xib file.
My question is how can I load another view controller from an action placed in the implementation file of the current view controller?
Now, I have this code:
UIViewController *mapViewController =
[[BSTGMapViewController alloc] initWithNibName:#"BSTGMapViewController"
bundle:nil];
How can I make it the "root view controller" of the window and maybe featuring a transition (considering my logic is ok)?
If you want to open the ViewController from another one then you should define it like this in your IBAction. It is good idea to make the viewController as property though.
FirstViewController.h
#class SecondViewController;
#interface FirstViewController : UIViewController
#property(strong,nonatomic)SecondViewController *secondViewController;
#end
FirstViewController.m
-(IBAction)buttonClicked:(id)sender{
self.secondViewController =
[[SecondViewController alloc] initWithNibName:#"SecondViewController"
bundle:nil];
[self presentViewController:self.secondViewController animated:YES completion:nil];
}
You should make a viewController as rootViewController in your AppDelegate class something like this
YourFirstViewController *firstViewController=[[YourFirstViewController alloc]initWithNibName:#"YourFirstViewController" bundle:nil];
self.window.rootViewController=yourFirstViewController;
I copied a working viewcontroller class from another project into a new project. I can't get the view to load in the new project. In the old project I used presentModalViewController. In the new I cannot get the view to load using either presentModalViewController or presentViewController
I am trying to load the present the view from my main view controller.
Here is what my main view controller interface looks like...
// ViewController.h
#import <UIKit/UIKit.h>
#import "RequestDialogViewController.h"
#interface ViewController : UIViewController <RequestDialogViewControllerDelegate> {
}
- (void)requestDialogViewDidDismiss:(RequestDialogViewController *)controller withResponse:(NSString*)response;
I am using presentModalViewController like this...
RequestDialogViewController *requestIPViewController = [[RequestDialogViewController alloc] initWithNibName:#"RequestDialogViewController" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:requestIPViewController];
[self presentModalViewController:navigationController animated:YES];
and presentViewController like this...
RequestDialogViewController *requestIPViewController = [[RequestDialogViewController alloc] initWithNibName:#"RequestDialogViewController" bundle:nil];
[self presentViewController:requestIPViewController animated:YES completion:nil];
What am I missing in the new project? The init method fires, but viewDidLoad does not and nothing is displayed.
Thanks
If ViewController is the root view controller, it can't present a modal view controller from within its own viewDidLoad, because at that point it doesn't have information like the screen size.
If other view controllers have already displayed, this will work. If the root view controller is a UINavigationController, you will see a view sliding in from the right while the modal view slides up from the bottom.
Anyway, for your ViewController, the soonest you could present it is after it has become visible. Using a timer for this is unreliable; older and slower devices have dramatically longer load times.
For more reliability, implement viewDidAppear: for ViewController. Do still use your timer system to add an additional delay; a fraction of a second should be sufficient. Although presenting the modal view controller from within viewDidAppear worked for me in the iOS 5.1 simulator, Presenting a modal view controller when loading another ViewController says it sometimes doesn't happen.
I have it resolved. I was trying to present the view from view did load of the main view controller. Not sure why it does not work there, but instead I am now setting a timer which calls a method to present the view controller after the main view loads and it works fine now using...
[self presentViewController:requestIPViewController animated:YES completion:nil];
Thanks to those who replied.
As #Dondragmer said, if you want to present your viewController in root view's viewDidLoad, it will fail.Once your viewController is ready for that, you can present your new viewController.
So, you can do that in
- (void)viewDidLayoutSubviews {
//present here
}
I encountered the same problem. But my situation is the presentViewController is called after the dismissViewControllerAnimated for another ViewController. My solution is to move the presentViewController to completion block of dismissViewControllerAnimated.
Present a modalViewController:
For the benefit of all starting programmers, type it instead of copy paste.
myVC *viewController = [[myVC alloc]initWithNibName:#"myVC" bundle:nil];
viewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:viewController animated:YES];
[viewController release];
It looks like you were trying to present a nav controller as a view controller in the first sample, then you were using the wrong method in the second one.
So let's say I have a viewController named homeViewController, and another view controller named listViewController
I display listViewController on top of homeViewController as a modal.
If the user clicks the off button, and then comes back to the app the modalViewController is gone.
ListViewController *listViewController = [[ListViewController alloc] init];
[self presentModalViewController:listViewController animated:NO];
[listViewController release];
Note: Application doesn't startup from scratch when this occures and the previous state is still visible
I'm assuming that by "off button" you mean the user locks the iDevice.
I just tried this in one of my apps and the modal view controller is still there after unlocking. My guess would be that it's something unrelated to the code you have posted. I would check your - (void)applicationWillResignActive:(UIApplication *)application method in your app delegate class and see if there's anything there that would dismiss the modal view controller.
Here is what the problem was.
When the user locks the screen I remove homeViewController from window
[homeViewController removeFromSuperview];
When user starts the app again I do
[windows addSubview:homeViewController];
that brings homeViewController on top of its modeal
First, I would like to warn that I am a complete newbie into iPhone coding...
I need to show up a viewcontroller from a library, I know that it is modal. I have a tab bar app (created with the default XCode template). I need to show that viewcontroller, there are no problem if it hides the tabbar itself... But I am quite clueless, I don't know even what to search, or what to read...
You can call presentModalViewController:animated: to display another UIViewController modally.
EDIT: If you want to display your modal view in response to a button touch (for example), you would display it like this:
- (IBAction)buttonTouched:(id)sender
{
ModalViewController* controller = [[ModalViewController alloc] init];
[self presentModalViewController:controller animated:YES];
[controller release];
}
Then when you want to dismiss the modal controller, call dismissModalViewControllerAnimated:. This can be called either on your main view controller, or the modal one.
I don't know even what to search, or
what to read...
View Controller Programming Guide is a good place to start to help you understand view controllers (including modal ones). If that's confusing, get a bigger picture with iOS Application Programming Guide or start at the very beginning.
You can call modal view as
YourViewController *yvc = [[YourViewController alloc] initWithNibName:#"YourViewController" bundle:YES]
[self presentModalViewController:yvc animated:YES];
You can call it in the IBAction method in case you want to call it on any control event like Button Click
-(IBAction)buttonClicked:(id)sender
{
YourViewController *yvc = [[YourViewController alloc] initWithNibName:#"YourViewController" bundle:YES]
[self presentModalViewController:yvc animated:YES];
}
You can call it using self.
Hope this helps you.
If you have more doubts on this then you can ask me.