I have the following code which works from my 'scorer' class apart from in the following scenario. I push another viewcontroller editscore, in that view do something, return to scorer pop the editscore and then in some circumstances i will end up pushing my legorderviewcontroller as shown below (it calls the same code). Only this time the new navigation bar is written over the top of the 'scorer' navigation bar and legorderviewcontroller doesn't appear. Does anyone know why this happens in this scenario?
legOrderViewController *controller = [[legOrderViewController alloc] initWithStyle:UITableViewStyleGrouped];
controller.leg = self.leg;
controller.delegate = self;
controller.match =self.match;
controller.set = self.set;
controller.managedObjectContext = self.managedObjectContext;
[self.navigationController pushViewController:controller animated:NO];
controller.playerChangeArray = playerOrder;
[controller release];
This might happen if you call pushViewController too fast after performing popviewcontroller WITH an animation. I ran into that issue once, disabling the animation solved it.
Related
I would like to display ABPersonViewController as a modal instead of pushing it on the navigation stack. I've got this working but to keep a done button present I've had to use an NSTimer to add the button every 0.25 seconds because the done button may be removed when the view appears and is always removed when the app enters the forground. This is a pretty lame hack so I'm wondering if anyone has a better idea :)
I made a subclass of ABPersonViewController that adds the done button and starts the timer on view did load and invalidates it when the view is deallocated.
Here is what my code looks like to show the modal:
- (IBAction)showContactModal:(id)sender{
CNABPersonViewController *personViewController = [[CNABPersonViewController alloc] init];
personViewController.displayedPerson = self.contact.record;
personViewController.addressBook = [[CNAddressBookManager sharedManager] addressBook];
personViewController.viewDelegate = self;
personViewController.shouldShowLinkedPeople = YES;
UINavigationController *navigationController =
[[UINavigationController alloc] initWithRootViewController:personViewController];
navigationController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:navigationController animated:YES completion:nil];
}
I had success in doing it like this. Insert this line to add a button to the navigation bar:
personViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:#"Test" style:UIBarButtonItemStylePlain target:self action:#selector(_yourAddressBookAction)];
If this does not solve your problem, please show us the code that you had the issue with.
I'm having some random crashes at this part of my code:
-(void) goBack {
[self performSelectorInBackground:#selector(addActivityIndicator) withObject:nil];
[self.navigationController popViewControllerAnimated:YES];
}
- (void)addActivityIndicator {
#autoreleasepool {
UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
UIBarButtonItem * barButton = [[UIBarButtonItem alloc] initWithCustomView:activityView];
[activityView startAnimating];
self.navigationItem.leftBarButtonItem = barButton;
}
}
When I want to exit the screen where these method exists, the other ViewController have to process some data. To inform the user that processing is occurring I add an activity indicator to the left button in my navigation bar.
The problem is that sometimes I get an exc_bad_access in addActivityIndicator method. The frequency is very random, sometimes the XCode shows the error at the end of #autoreleasepool, sometimes at the line self.navigationItem.leftBarButtonItem = barButton;
I imagine that sometimes my viewController is destroyed but the thread is still running and try to access the navigationItem of a object that don't exists anymore. But I'm not sure if that is the problem and I don't know how to fix it.
I'm using ARC in my project and this problem occurs in all iOS versions that I tested.
Please, anyone can explain me what is happening and how can I fix this?
Thanks.
You should never do UIKit stuff in the background.
By calling [self performSelectorInBackground:#selector(addActivityIndicator) withObject:nil]; you are updating the UI on a background thread. You should only ever update the UI on the main thread.
Edit
Based on your comment you are trying to have the UI update before the view pops. The way to do that would be:
[self addActivityIndicator]
[navigationController performSelector:#selector(popViewControllerAnimated:) withObject:[NSNumber numberWithBool:YES] afterDelay:0];
You could also look into dispatch_after
I'm building an app that currently has 3 ViewControllers. One of them is used after a successful login so is not relevant in this question.
I'm using a mixture of Storyboards and building things programmatically when I find Storyboards do not give me the fine control that I need.
The first ViewController is built in my 'MainStoryboard'. It has a login form and an info button at the bottom. I link it up the my AppDelegate by doing the following inside didFinishLaunchingWithOptions:
ViewController *viewController = (ViewController *)self.window.rootViewController;
Because I wanted to force rendering of a UIWebView (another story) I create the second view programmatically. I do the following inside didFinishLaunchingWithOptions:
infoViewController = [[InfoViewController alloc] init];
[infoViewController view];
Inside both of my ViewControllers I setup a link to appDelegate as below:
appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
I have an info button in my first ViewController that takes you to the infoViewController. It calls the following code when tapped:
appDelegate.infoViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:appDelegate.infoViewController animated:YES];
The above works just fine for me, flips over the screen and shows the InfoViewController.
On my InfoViewController I have a button that should take you back to the login page, I have tried all sorts to get this to work but it just crashes my app. Nothing seems to work. I have tried the following:
appDelegate.viewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:appDelegate.viewController animated:YES];
and
[self.navigationController popToRootViewControllerAnimated:YES];
and
[self.navigationController popViewControllerAnimated:YES];
and
[self.navigationController popToViewController:appDelegate.viewController animated:YES];
I suspect the last 3 might be more to do with when you have a navigation view controller and you want to go back to the root? I'm not sure, but either way it does not work. I had this working using storyboards previously so I'm sure it ought to be easy! As mentioned I switched to making the infoViewController programmatically so that I could force the UIWebView to render before the view appeared.
Any help much appreciated.
You can do with:
[self dismissModalViewControllerAnimated:YES];
You should use this.
[self dismissModalViewControllerAnimated:YES];
You should use a main controller for switching between your other view controllers. Change the view of your root controller to one of your other view controllers (apply animations as usual if needed). Hold a pointer to your root controller in your other view controllers and call self.rootController.view = <desired_controller_instance>.view
I think the way you're presenting your InfoViewController is wrong. Do it the following way:
In your ViewController, create an action for the info button.:
- (IBAction)infoButtonTapped:(id)sender
{
InfoViewController *infoViewController = [[InfoViewController alloc] init];
infoViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:infoViewController animated:YES];
}
And in your InfoViewController, in the action of your button that should take you back write this:
- (void)takeBackToViewController
{
[self dismissModalViewControllerAnimated:YES];
}
Hope it works.
Also in presented controller you can use this
if(self.parentViewController)
[self.parentViewController dismissModalViewControllerAnimated:YES];
else
[self.presentingViewController dismissModalViewControllerAnimated:YES];
To dissmiss current controller.
I'm trying to create another UINavigationBar in my project, but it seems that I'm missing some key detail. When the application first loads, it does have it's own navigation system, but now I'm trying to add another navigation to a modal.
Many tutorials show you need to connect the view to the [self window], which only seems to work in the AppDelegate files, but when I've tried placing the code* in viewDidLoad, I can never seem to build without any errors.
I've seen this in multiple apps, but how is this done (programmatically or with IBuilder)?
Thanks!
Example code I've tried in viewDidLoad
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:[self viewController]];
[self.window addSubview:navigationController.view];
You don't show enough code to be able to understand how you do it, but it seems to me that you are showing a controller modally, then trying to add as a subview to its view a navigation controller.
You can try and directly push modally your navigation controller (from your app delegate or where it makes sense for your app):
(IBAction) navigateToSecondaryViewController {
if (secondaryViewController == nil) {
informationTableViewController = [[SecondaryViewController alloc]
initWithNibName:#"SecondaryViewController"
bundle:[NSBundle mainBundle]];
secondaryViewController.delegate = self;
}
if (navController == nil) {
navController = [[UINavigationController alloc]
initWithRootViewController:secondaryViewController];
}
[self presentModalViewController:navController animated:YES];
}
Full example here.
I am new at Objective C. I am just trying to build an iphone app. I have created some NIB file, and i have gone to other NIB file by creating an object and using this code:
scoreViewController *sviewController = [[scoreViewController alloc] initWithNibName:#"scoreViewController" bundle:nil];
self.scoreView = sviewController;
[sviewController release];
// Setup the animation
[self.navigationController pushViewController:self.scoreView animated:YES];
Now I want to come back to the same page. For this case I have done the same work, but it does not work when I add the previous page header file name.
mainViewController *mainviewController = [[mainViewController alloc] initWithNibName:#"mainViewController" bundle:nil];
self.mcoreView = mainviewController;
[mainviewController release];
// Setup the animation
[self.navigationController pushViewController:self.mcoreView animated:YES];
So, I will be most grateful if you were so nice to post your comment.
I am not 100% sure what you are asking, but I think you want to go back from the the second controller to the first. What you are doing here is instantiating a second instance of the first controller (so you now have 3 controllers), and pushing it onto the stack. Assuming I have this correct, then if you want to move back to the first controller you should be popping the second controller off the stack, not adding a 3rd:
//mainViewController *mainviewController = [[mainViewController alloc] initWithNibName:#"mainViewController" bundle:nil];
//self.mcoreView = mainviewController;
//[mainviewController release];
// Setup the animation
[self.navigationController popViewControllerAnimated:YES];