I am presenting a view controller programmatically but when the device is rotated it's getting auto-dismissed.
I don't know why it happens and how do I fix it
Here is the code
UINavigationController* navC = blah blah.
ViewContoller* vc = blah blah
[navC setViewControllers:#[vc]];
// Normal case.
if (![[[self window] rootViewController] presentedViewController]) {
[[[self window] rootViewController] presentViewController: navC animated:true completion:nil];
}
I have kept the code in appdelegate
Any help in resolving this is appreciated
Related
I have a code like this to present a TOWebViewController that contain URL to my company web page.
TOWebViewController *webViewController = [[TOWebViewController alloc] initWithURL:url];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:webViewController];
[[[[UIApplication sharedApplication] delegate] window] setRootViewController:navigationController];
After its open how I get back to my previous view or dismiss the root view controller since my navigator bar only show grey bar.
thanks
Use [self presentViewController:imagePickerController animated:YES completion:nil]; instead.And don't use root view controller!
you need to create a custom back button #selector and in it you need to set [[[[UIApplication sharedApplication] delegate] window] setRootViewController:previousViewController];
though you need the reference of your previous viewController, however i won't recommend this approach.As #lumialxk said, use this instead [self presentViewController:imagePickerController animated:YES completion:nil];
In a view that was created modally, pressing a button causes the modal view to be dismissed and another modal view to load.
- (void)loadLanguageSelectionView {
[self dismissViewControllerAnimated:YES completion:nil];
UIViewController *languageSelectionController = [[LanguageSelectionViewController alloc] initWithNibName:nil bundle:nil];
[languageSelectionController setModalPresentationStyle:UIModalPresentationCustom];
[languageSelectionController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentViewController:languageSelectionController animated:YES completion:nil];
}
The following error is thrown when this code block executes:
DenkoStation[4259:73173] Warning: Attempt to present <LanguageSelectionViewController: 0x7b185430> on <ViewController: 0x79f52e50> whose view is not in the window hierarchy!
What surprises me is the fact that the code was running happily before I made some changes to my code as outlined here.
Where's the mistake?
Because you are trying to present a viewController on top of a viewController which is already dismissed and no longer in window hierarchy.
What you can try is, you can take the ParentViewController reference from current viewController and then you can present new viewController on ParentViewController Like This :
- (void)loadLanguageSelectionView {
UIViewController *parentController = self.presentingViewController;
[self dismissViewControllerAnimated:YES completion:^{
UIViewController *languageSelectionController = [[LanguageSelectionViewController alloc] initWithNibName:nil bundle:nil];
[languageSelectionController setModalPresentationStyle:UIModalPresentationCustom];
[languageSelectionController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[parentController presentViewController:languageSelectionController animated:YES completion:nil];
}];
}
I am trying to show navigation controller when i present PresentViewController for navigate a screen. I solved this problem, but i faced another problem. Problem is when i push to a screen that time back button is visible on next screen with navigation controller. But when i am trying to PresentViewController, that time navigation bar is visible but not back button.
Here is my code:
- (IBAction)clickMeAction:(id)sender
{
ViewController1 *viewcontrol = [self.storyboard instantiateViewControllerWithIdentifier:#"ViewID"];
//[self.navigationController pushViewController:viewcontrol animated:YES]; // this is for push to viewcontroller
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewcontrol];
[self presentViewController:navigationController animated:YES completion:nil]; // This is for modalviewcontroller
}
Here is my output:
with push:
with modal:
Please help me.
Method 1:
[navigationController presentViewController:navigationController animated:YES completion:^{
[navigationController setNavigationBarHidden:YES animated:NO];
}];
Method 2: in presentViewController
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.navigationController.navigationBarHidden = YES;
}
Guys in my app I have some code in the app delegate method application:didFinishLaunchingWithOptions: that determines if the initial View Controller should be the LoginViewController or the MainViewController.
If the LoginViewController is showed first and the user logs in successfully I show the MainViewController modally with this piece of code:
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
FSMainViewController *vc = (MainViewController *)[storyBoard instantiateViewControllerWithIdentifier:#"MainViewController"];
vc.loginViewController = self;
[self presentViewController:vc animated:YES completion:nil];
What I want to do next, after the MainController is showed on the screen, is remove the LoginViewController from memory so in the viewWillApper:animated: method of the MainViewController I use this code to remove (or at least try to) the LoginViewController:
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
if (self.loginViewController) {
[self.loginViewController dismissViewControllerAnimated:NO completion:nil];
}
}
Problem is that this code leads to strange behaviors like the MainViewController being removed from the screen and this error message showing up in the console.
Unbalanced calls to begin/end appearance transitions for <LoginViewController: 0xb06e350>
I also tried calling [self dismissViewControllerAnimated:NO completion:nil] in the completion block of the presentViewController:animated:completion method but still no luck, it didn't work.
What am I doing wrong? How can I remove from memory the underlying LoginViewController when the MainViewController is presented modally?
Don't present your main view controller if you want the login controller to go away, just make it the window's root view controller.
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
FSMainViewController *vc = (MainViewController *)[storyBoard instantiateViewControllerWithIdentifier:#"MainViewController"];
Self.window.rootViewController = VC;
You can't dismissViewController after presenting another one on it or its presentingViewController. At here, you should dismiss LoginViewController first, then present MainViewController.
Otherwise, if you'd like pushViewController, you can call [self.navigationController setViewControllers: animated:] to remove LoginViewController.
If you think presentingViewController is just what you want, try something like this in application:didFinishLaunchingWithOptions:
if (self.loginViewController) { //Define loginViewController in appDelegate.h
[self dismissViewControllerAnimated:NO completion:^{
[self presentViewController:mainViewController animated:YES completion:nil];
}];
}
else{
[self presentViewController:mainViewController animated:YES completion:nil];
}
This only accours if you are presenting in a view controller that is managed by a navigation controller.
The reproduction steps are:
1 - Present a view controller using UIModalPresentationCurrentContext
self.definesPresentationContext = YES;
ViewController* viewController = [[ViewController alloc] init];
viewController.modalPresentationStyle = UIModalPresentationCurrentContext;
[presentOnViewController presentViewController:viewController animated:YES completion:nil];
2 - Present a view controller over the top using the default full screen presentation style
ViewController* viewController = [[ViewController alloc] init];
[self presentViewController:viewController animated:YES completion:nil];
3 - Dismiss the top presented view controller (the full screen one)
[self dismissViewControllerAnimated:YES completion:nil];
Now the problem is the 2nd view controller (presented using UIModalPresentationCurrentContext) disappears. Also it is impossible to present another view controller using UIModalPresentationCurrentContext, because the system thinks its still there.
I believe the issue is a bug in the framework. As mentioned it only occurs when the presenting in a view controller managed by a navigation controller. There is a nasty work around which uses the containment API. It creates a dummy view controller which views are presented from. The steps are:
1 - When presenting a view in context who's parent is a navigation controller, use a dummy view controller:
- (void)presentInContext
{
UIViewController* presentOnViewController = self;
if ([self.parentViewController isKindOfClass:[UINavigationController class]])
{
// Work around - Create an invisible view controller
presentOnViewController = [[DummyViewController alloc] init];
presentOnViewController.view.frame = self.view.frame;
// Containment API
[self addChildViewController:presentOnViewController];
[self.view addSubview:presentOnViewController.view];
[presentOnViewController didMoveToParentViewController:self];
presentOnViewController.definesPresentationContext = YES;
}
ViewController* viewController = [[ViewController alloc] init];
viewController.modalPresentationStyle = UIModalPresentationCurrentContext;
[presentOnViewController presentViewController:viewController animated:YES completion:nil];
}
2 - When dismissing the view controller tidy up
- (void)dismissSelf
{
__weak UIViewController* presentingViewController = self.presentingViewController;
[self dismissViewControllerAnimated:YES completion:^{
// Remove the dummy view controller
if ([presentingViewController isKindOfClass:[DummyViewController class]])
{
[presentingViewController willMoveToParentViewController:nil];
[presentingViewController.view removeFromSuperview];
[presentingViewController removeFromParentViewController];
}
}];
}
Thats it... The fix is dirty, but does the trick with no visual flicker.