I have a situation where I am performing some initialization in an App. Upon first startup I have to present an EULA with an I Agree/I Don't Agree button selection. When the I Agree selection is made I display a modal view which prompts for a username and password. This all works fine. The problem is that after the username and password are verified and the modal view is dismissed. I am left with the EULA view still being displayed on the screen rather than the base table view of the App. I do the following in the EULA viewcontroller code:
- (IBAction)didAgree:(id)sender {
LoginViewController *lvc=[[[LoginViewController alloc] init] autorelease];
lvc.modalTransitionStyle=UIModalTransitionStyleCoverVertical;
[self presentModalViewController:lvc animated:YES];
[self.view removeFromSuperview];
}
If I move the last line (removeFromSuperview) to before the presentModal call then, of course, the Login view does not display.
In the login view controller code I have this after the login button is pressed:
[[self parentViewController] dismissModalViewControllerAnimated:YES];
[[self parentViewController].view removeFromSuperview];
If I run with this code, the modal view disappears and the table view appears briefly before disappearing with the EULA view remaining on the screen. If I comment out the second statement, then I never see the table view.
I know this I am missing something incredibly obvious but I am at a loss and have been stuck on this for quite a while.
I think the problem is here:
[self presentModalViewController:lvc animated:YES];
Mainly the self there. This means that you present the login screen modally from what self is: your EULA-ViewController. You can't remove the EULA screen now.
I suggest presenting the login screen first, maybe either all grayed out or not showing anything at all, and the presenting the EULA modally from it.
Related
I have two ViewControllers one named ViewController and another named Signup,
Here is the code I use to call the Signup.xib file,
- (IBAction)signupButton:(id)sender {
Signup *myView = [[Signup alloc] initWithNibName:#"Signup" bundle:nil];
[self.view addSubview:myView.view];
}
This code works. It starts up the Signup Viewcontroller but When I try to call the ViewController.xib file from the Signup.m It doesn't work.
Here is how I call the ViewController.xib file from the Signup.m file,
- (IBAction)loginView:(id)sender {
ViewController *dashboardView = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
[self.view addSubview:dashboardView.view];
}
I have imported the ViewController.h file within the Signup.m file.
The loginView button works because I placed an NSLog() in the button to see if it worked and it does. But When I click the loginView button I get some type of error. I don't know what errors are in xcode but its something like this,
0x110309b: movl 8(%edx), %edi <- Thread 1: EXc_BAD_ACCESS (code=1, address=0x60000008)
It is highlighted in green and I don't know what it means.
As user Priyatham51 said, number 3 is the reason why you are getting the error. The alternative, IF you are not using UINavigationController to push/pop views, is to to present the Signup view controller as a modal view. Then when you want to go back, you can call inside the Signup controller.
[self dismissModalViewControllerAnimated:YES];
However you need to change your signup button to.
- (IBAction)signupButton:(id)sender {
Signup *myView = [[Signup alloc] initWithNibName:#"Signup" bundle:nil];
[myView setModalPresentationStyle:UIModalPresentationFormSheet]; //you can change the way it is presented
[myView setModalTransitionStyle:UIModalTransitionStyleCoverVertical]; //you can change the animation
[self presentModalViewController:myView animated:YES]; //show the modal view
}
I hope this helps you.
Try this to present Signup view to user :
- (IBAction)signupButton:(id)sender {
Signup *myView = [[Signup alloc] initWithNibName:#"Signup" bundle:nil];
[self presentModalViewController:myView animated:YES];
}
And back to Login view by dismissing the signup view controller
- (IBAction)loginView:(id)sender {
[self dismissModalViewControllerAnimated:YES];
}
You don't generally add View Controller's views to your current view, but if it is what you want to achieve then try cleaning project first. Sometimes XCode fails to properly load nib files after you add/remove them. Go to Product menu-> "Clean", then hold down "Option" key, go to Product Menu and press "Clean Build Folder".
Also, add "All Exceptions" breakpoint. It will be on the left side panel of XCode, under tab "Breakpoints". On that tab there is "+" button at the bottom. Click "Add Exception Breakpoint" and then just press "Done". This basically will give you more information about your crash.
I know that this doesn't exactly help to fix your problem, but will give you more details on it.
The main reason why your code is not working because you are trying to add your ParentView to the subview as a child again and you are not supposed to do that.
It seems like your are trying to do this.
You created your LoginView
You created your SignupView and added it as subview to LoginView. So the LoginView is parent and signup is child.
(Here is your mistake ). You are trying to add the LoginView as the subview of the SignupView. Which is never going to work.
Try doing this
I would suggest you create your LoginView first and have button "SignUp". So when a user clicks on signup "Push" the new SignupView Controller on top the loginViewController. And have a button "Login View" on your signup view . When user click on that button try to "dismiss current view controller". So user will be shown the login view again. You can use this as work around.
Please take a look at this example
http://www.roseindia.net/tutorial/iphone/examples/pushView.html
Here one more working example
http://www.theappcodeblog.com/2011/08/15/iphone-development-tutorial-present-modal-view/
i have a tough one for you today. I have two tableViews in my app the first is on the first page. There are two other pages the user drills down to get to the second table view. After i leave the first table view, i can press the back buttons to get back perfectly until i reach the second table view. As soon as i drill down to the second table view and then try to return to the first via pressing the back buttons. As soon as i get to the last back button to return to the first table view, the app crashes. The code for the back buttons is simply:
- (IBAction)goBack:(id)sender {
[self dismissModalViewControllerAnimated:YES];
}
Any Help Would be greatly appreciated!! Thanks everyone!! :D
Whenever I create a modal view controller from a XIB, the automatic #property generator duplicates things in the Dealloc method, thus throwing an EXC_BAD_ACCESS when the view is dismissed. Make sure you aren't releasing something twice.
Sounds like your are releasing something too early. Open you app in instruments (command + i) and run a zombie test.
As soon as you see zombie has been messaged expand the right panel and have a look at the user code (your code) blocks. Indicated by the back person icon.
Double click that and it will indicate what it was trying to access that had already been released.
Are your tableviews being displayed in a modal window? If not, why are you calling [self dismissModalViewControllerAnimated:YES]? Shouldn't you be calling [[self navigationController] popViewControllerAnimated:YES]?
If you're using a UINavigationController, the back button functionality should be provided automatically.
if you are using [[self navigationController] popViewControllerAnimated:YES] to
then for back you write as mentioned below:
(IBAction)goBack:(id)sender {
// Tell the controller to go back
[self.navigationController popViewControllerAnimated:YES];
}
if you are using [self presentmodalviewcontroller: animated:]
then only [self dismissModalViewControllerAnimated:YES] will work
you try this [[self navigationController] popViewControllerAnimated:YES]
I have a Navigation Controller that is presented modally with 4 views in the stack. The final view has a done button that dismisses the modal view. When I then present the modal view again, it automatically goes to that last view instead of the first one. I added a line to pop to first view after dismissed but it adds a weird animation whether I set it to YES or NO. Maybe I'm doing it wrong?
- (void)dismissModalView
{
[self dismissModalViewControllerAnimated:YES];
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:([self.navigationController.viewControllers count] -4)] animated:YES];
}
Update:
This is the method used to present the modal view/navcontroller
- (void)showModalView
{
self.optionsNavController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self.navigationController presentModalViewController:self.optionsNavController animated:YES];
}
No, it looks right. If you want to retain the state of the Navigation controller then don't present it modally as it will get deallocated when you dismiss the view.
Modal views are usually used to present information that only needs to be shown briefly without maintaining the state of the view (i.e. about page, login page, settings page, etc).
Excuse me if I'm oversimplifying your issue, but if your need is to pop straight back to the first view controller, perhaps you could give the popToRootViewControllerAnimated: method a try instead of popToViewController:.
I'm not sure what the problem with the dismiss code you posted is, but the following should work:
- (void)showModalView
{
self.optionsNavController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self.optionsNavController popToRootViewControllerAnimated:NO];
[self.navigationController presentModalViewController:self.optionsNavController animated:YES];
}
Also, viewDidLoad is intended to only be called once every time the view is loaded, viewWillAppear a
I have a view which is presented as a modal view controller which takes username and password credentials. I want this view to check the delegate, and if the user hasn't previously set an unlock pin for the app, to then show the change pin view as a modal view controller. This is my code...
+(void)presentCredentialsViewController:(UIViewController *)vc{
CredentialsViewController *cvc = [[CredentialsViewController alloc] init];
[vc presentModalViewController:cvc animated:FALSE];
}
and then in CredentialsViewController
-(void)viewDidLoad{
[super viewDidLoad];
if([appDelegate.pin isEqualToString: #""]){
UserPrefsViewController *upvc = [[UserPrefsViewController alloc] init];
upvc.cancelButton.hidden = true;
[self presentModalViewController:upvc animated:FALSE];
}
}
But for some reason it doesn't work. The debugger steps through the code without error, never the less, the second modal view controller isn't displayed.
First, I would suggest checking that your appDelegate.pin is blank and not nil. If it is nil, the if statement would not be satisfied and your second ModalView would not be presented.
You may also want to try the previous suggestion, calling presentModalViewController from viewDidAppear, or setting a delay if leaving it in viewDidLoad. It is possible that the CredentialsViewController is trying to present the second view when it has not yet presented itself.
The if statement is being hit and the second PresentModalViewController is executing without error, but it just wasn't displaying. I did try putting the code in ViewDidAppear and a load of other places as well, such as applicationWillBecomeActive etc. Although not actually crashing the code, still none of these approaches would show the view controller. In the end I have opted for this:
start with pin of #""
on applicationDidEnterBackground check if pin has been set
if yes
PresentModalViewController: PinViewController
if no
do nothing
Bit of a hack but it will do for now. I suppose I should put some sort of notification in somewhere warning that the pin hasn't been set. The suggestion about the delay may possibly work I suppose. I might give it a go in the future. Thanks guys....points up!
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